Newcon Optik NVS 6 User Manual

NVS 6

PILOT NIGHT VISION

GOGGLES

MAINTENANCE AND OPERATION

MANUAL

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NVS 6

MANUAL

IMPORTANT INFORMATION

Read prior to activation

You have just purchased a complicated electronic device. To operate it

properly, please read this manual carefully. Here are some common

precautions that must be noted.

• NEVER disassemble the unit. This device contains high voltage, which may
be hazardous to your health!

• NEVER expose the opened objective lens of an active unit in daylight. At

daytime objective lens must be covered by caps. There is a tiny hole in the
cap to provide enough light for daytime testing. It is allowed to turn on the
unit at daytime, but caps must cover the lenses.

• NEVER aim active unit at intense light sources

(i.e. lights, headlamp, campfires, the moon, etc.)

• NEVER reverse the polarity of a battery

●

ALWAYS remove batteries when not in use for a long period

• ALWAYS keep the objective lenses covered when not in use

• ALWAYS store in a warm dry place when not in use

RECORD OF REVISIONS

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MANUAL

RECORD OF REVISIONS

NVS 6

Rev. Section,

No. Sub-Section,

Subject

Revi-

sed

Page

Added

Authorizing Transmittal letter
Document

Dele-

ted

No.

Reference No.

and date

Signed

Date

by

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NVS 6

MANUAL

LIST OF EFFECTIVE PAGES

Section,

Sub-Section,

Subject

Title Page

Record of
Revisions

List of Effective
Pages

Table of Contents 1/2

Page Date

– –

1/2

1/2

General 1
2
Main Data 3
4
Standard Set 5
6
Safety Precautions 7
Design of Unit and 8
Its Components 9
10
11
12
13
14
15
16
17
18
Preparation for 19
Operation 20
21

Section,

Sub-Section,

Subject

23
24
25
26
27
28
29
30
31
32
33
34
35
Operation Proce- 36
dure 37
Operational 38
Status Check 39
Trouble Shooting 40
41
42
43
Maintenance 44
Practices 45
46
47
48
Storage and 49
Shipment 50

22

Page Date

LIST OF EFFECTIVE PAGES

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1/2

NVS 6

MANUAL

TABLE OF CONTENTS

Page

1 General........................................................................................................ 1

2 Main Data ....................................................................................................3

3 Standard Set................................................................................................ 5

4 Safety Precautions....................................................................................... 7

5 Design of Unit and Its Components............................................................. 8

6 Preparation for Operation .......................................................................... 19

6.1 Preparation of Helmet for Mounting Night-Vision Goggles...................... 19

6.2 Individual Adjustment and Fitting............................................................. 22

6.3 Arrangement of Night-Vision Goggles on Helicopter............................... 32

7 Operation Procedure .................................................................................36

8 Operational Status Check.......................................................................... 38

9 Trouble Shooting .......................................................................................40

10 Maintenance Practices ............................................................................44

11 Storage and Shipment............................................................................. 49

APPENDIX A ................................................................................................. 51

APPENDIX B ................................................................................................. 52

CONTENTS

Pages

1/2

NVS 6

MANUAL

1 General

1.1 The NVS 6, helicopter night-vision goggles, have been
designed for use by the helicopter crewmembers during execution of
flights at night.

Note – The helicopter cockpit should be tailored for the use of the
night-vision goggles. Accounting for the spectral content of the light
equipment radiation, color of the cockpit interior surfaces, and the like.

1.2 The NVS 6 provides napping off the earth while piloting the
helicopter at low altitudes, at takeoff, hovering and landing, including
landing on unprepared and non-illuminated landing sites.

1.3 When using the NVS 6, the pilot can take the readings of the
instruments by looking at the instrument panel in the downward direction
or sideways past the eyepieces.

1.4 The NVS 6 operates within the ambient temperature range of
minus 40 to +40

1.5 The power supply to the NVS 6 is powered by the helicopter
electrical system of 27V, via the voltage converter or from the
independent power source (IPS). The IPS is built-in to the goggles and
consisting of two batteries of type size AA R6 1.5V or from rechargeable
batteries of the same type.

Note – The IPS (independent power source) is used when the

aircraft electrical power is lost or the helicopter power supply has failed.

1.6 The NVS 6 shall be used under the following conditions:

– When the natural night illumination intensity is within 5·10

and the meteorological visibility is 1 to 10 km

– At a flight altitude of 20 to 200 m;

– At a flight speed of up to 120 km/h.

o

C.

-3

to 1 lx

Page

1

NVS 6

MANUAL

1.7 The trouble-free operation of the NVS 6, within the assigned
service life, is ensured through its correct use, careful handling and well­timed maintenance.

1.8 When operating the unit or placing it in storage, keep it clean
and avoid touching the external optical surfaces of the lenses and
eyepieces with fingers. Protect the unit against impact or dropping which
may cause damage and defects to the unit and render it inoperable.

1.9 Before using the NVS 6, carefully read this Manual.

1.10 In the course of the service of the unit, enter the information
pertaining to its operational status, maintenance, storage and repair in the
Log Book.

Page 2

NVS 6

MANUAL

2 MAIN DATA

2.1 Specifications of the NVS 6 are presented in Table 1.

Table 1

Specification Characteristic

1 Field of view (FOV), minimum 40 deg

2 Magnifying power 1 X

3 Resolving power limit of the image intensifier

tube, as measured in the center of FOV, minimum

4 Dioptric setting range of eyepieces, minimum -6/+2 D

5 Interpupilary distance range 52 to 72.7 mm

6 Lens focusing distance range 0.25 m to infinity

7 Power supply:

– From helicopter DC electrical system via a

voltage converter

– From two batteries of type size AA R6 1.5 V

or rechargeable batteries

8 Current consumed with the unit powered from

helicopter electrical system, maximum

9 Power consumed with the unit powered from

helicopter electrical system, maximum

10 Continuous operation time of the unit powered
from the built-in independent power source without
changing the batteries (within the entire operating
temperature range), minimum

50 lines per mm

24.0 to 29.4 V

2.2 to 3.2 V

100 mA

3 W

3 h

Page 3

Table 1, cont'd

Specification Characteristic

NVS 6

MANUAL

11 Continuous operation time followed by an

interval of not less than 30 min, minimum

12 Unit deployment time (getting the unit ready

for use), maximum

13 Unit stowing time (packing the unit in the

case), maximum

14 Mass, maximum:

– Night-vision goggles (without mount) 0.59 kg

– Voltage converter with cable 0.3 kg

15 Night-vision goggles overall dimensions,

maximum

3 h

5 min

5 min

108x151.5x122 mm

Page 4

NVS 6

MANUAL

3 STANDARD SET

3.1 The standard set of the NVS 6 shall be consistent with Table 2

and Fig. 3.1.

Table 2

Designation Nomenclature Qty Remarks

Assemblies

201211.010 Night-vision goggles 1

433739.003 Voltage converter 1

Set of Spare Parts

279376.002 Dehydrator cartridge 1 Optional

Set of Tools and Accessories

Watchmaker’s

screwdriver MT-992, size

1.5

754421.001 Test pattern 1 Optional

Batteries of type size

AA R6 1.5 V

304134.001 Mount 1

745159.003 Casing 1

745159.001 Clamp 1

305259.001 Counterweight 1

741112.013 Cloth 3 Optional

Packaging

325371.009 Soft Padded Case 1

1 Optional

Optional

4

Page 5

NVS 6

2

MANUAL

8

1

7

1

9

2 11 6 3 4 5

1 Night-Vision Goggles
2 Voltage Converter
3 Dehydrator Cartridge
4 Screwdriver
5 Test Pattern
6 Batteries

10

7 Mount
8 Casing
9 Clamp
10 Counterweight
11 Cloth
12 Case

NVS 6 Standard Set

Figure 3.1

Page 6

NVS 6

MANUAL

4 SAFETY PRECAUTIONS

4.1 The NVS 6 is constructed so as to provide pilot’s safety during

operation.

4.2 In case of emergency the helicopter crewmembers shall take
off (throw off) the NVS 6 night-vision goggles before evacuating the
helicopter.

To ensure successful removal of the unit, the crewmember using
the NVS 6 in flight should be trained to quickly execute the night-vision
goggles. In an emergency evacuation from the helicopter expedient
removal is essential for his/her safety.

4.3 Care should be taken to protect the unit from direct exposure of

its lenses to high-level optical radiation.

CAUTION: NEVER SWITCH ON THE UNIT DURING DAY LIGHT
UNLESS PROTECTIVE CAPS ARE INSTALLED ON THE UNIT
LENSES. DO NOT KEEP THE UNIT IN THE BRIGHT LIGHT SOURCES
FOR LONG PERIODS OF TIME.

Page 7

NVS 6

MANUAL

5 DESIGN OF UNIT AND ITS COMPONENTS

5.1 The NVS 6 is essentially a passive-type optoelectronic night­vision device whose principle of operation is based on the intensification
of image brightness of objects being viewed with the aid of image­intensifier tubes.

5.2 The NVS 6 design employs a binocular pattern, i.e. it consists
of two identical optoelectronic channels (of monocular type) which afford
stereoscopic vision to create comfortable conditions for napping off the
earth, thus enabling the pilot to evaluate the space depth and ensure
higher night flight safety.

5.3 The general view of the NVS 6 is illustrated in Fig. 5.1.

5.3.1 Lenses (1) may be focused either relative to distant objects
located in the space outside the cockpit, or relative to the objects located
close to the helicopter. The focus is adjusted by rotating the lenses.

5.3.2 The dioptric focusing of eyepieces (2) is carried out
individually for each sight channel of the unit by rotating eyepieces with
the aid of focusing rings (3).

5.3.3 The independent power source (IPS) is arranged inside
guide (4), which is closed with cap-switch (5).

5.3.4 The NVS 6 is installed onto the pilot’s helmet by attachment of
fixing assembly (6) of the unit to mount (7), which is then secured to
helmet casing (8).

The fixing assembly makes it possible to perform individual
adjustment, so as to provide the most comfortable position of the goggles
mounted on the helmet relative to the pilot’s eyes. This feature enables
the pilot to move the goggles away from the eyes, tilt the optical axes of
monocular pair and displace them upwards and downwards.

Page 8

17

13

NVS 6

MANUAL

7 18 20

6

19

4

8

16

9

1

12 14 2 3 5 15 11

1 Lens
2 Eyepiece
3 Ring
4 Guide
5 Cap-Switch
6 Fixing Assembly
7 Mount
8 Casing
9 Counterweight
10 LVC (Low-Voltage Converter)

10

11 Cable
12 Cap
13 Dehydrator Cartridge
14 Sight Glass
15 Cable
16 Screw
17 Visor Guard
18 Slot
19 Cross-Shaped Knob
20 Screw

NVS 6

Figure 5.1

Page 9

NVS 6

MANUAL

For balancing out the overturning momentum produced by the unit
in the operating position, use is made of counterweight (9) secured on the
rear portion of the helmet.

The helmet should be tailored for employment of the night-vision
goggles. For this purpose, the standard casing should be replaced and
the strip of the sticking fastener should be bonded to the helmet rear
surface for attachment of the counterweight (the necessary appliances
are included in the set of spare parts).

Note: other helmets may require different mounting mechanisms

5.3.5 Caps (12) are intended to safeguard the image intensifier
tubes against exposure to light and protect the optical components of
the lenses from mechanical damage.

The caps are provided with holes for checking the night-vision
goggles for serviceability at an illumination intensity of more than 1 lx (in
conditions of day light and dusk), as well as with retainers (two spring­loaded projections located on the cap sides) used for reliable locking of
the cap in the mount of lens (1).

Small projections in the sides of the cap are provided, with holes for
joining the caps, in pairs by means of a fishing line. This will minimize
their inadvertent loss in service.

5.3.6 The moisture-resistance of the unit is ensured with the use of
annular rubber seals and dehydrator cartridges (13). These are intended
to absorb moisture in case it gets into the interior space of the monocular
pair. The dehydrator cartridge is filled with silica gel that is bluish in color
when it is not saturated. As the silica gel gets saturated, it turns rose-pale
or off-white. The external condition of the silica gel is monitored through
sight glass (14).

5.4 The NVS 6 standard set comprises the night-vision goggles, the
voltage converter and the single set of spare parts. (Optional)

Page 10

NVS 6

АВА

MANUAL

16

13

14

22

17

18

9

3

Б Б

15

21

1 10 4

В

5 7 8 6 10 12 19 20 10 1

19

1 Guide
2 Guide
3 RH Side Monocular
4 LH Side Monocular
5 Lens
6 Eyepiece
7 Image-Intensifier Tube
8 Barrel

9 Screw
10 Button
11 Batteries
12 Cap-switch
13 Fixing Assembly
14 Retainer
15 Button

Night-Vision Goggles

Figure 5.2

2

16 Cable
17 Lever
18 Knob
19 Screw
20 Plate
21 Retainer
22 Retainer

Page 11

NVS 6

MANUAL

Physically, the night-vision goggles are made in the form of two
identical electro-optical channels – monocular (3) and monocular (4) –
which are mechanically linked with each other with the aid of guide (1)
and guide (2). Each of the monocular pair incorporates lens (5), eyepiece
(6), image-intensifier tube (7) and barrel (8).

RH side monocular (3) that allows the pilot to carry out observation
with the right eye is rigidly fastened to guide (2), while LH side monocular (4)
that permits observation with the left eye is of a movable design and may
be displaced to adjust the eyepieces of the night-vision goggles to suit the
pilot’s eyes.

To adjust the night-vision goggles interpupilary distance, depress
button (10) and displace monocular (4) along guide (2) to set it to the
desired position. These done, release the button to fix monocular (4) in
the selected position.

Batteries (11) are installed inside guide (2) and closed with cap­switch (12).

The night-vision goggles are attached to the helmet with the aid of
the guides of fixing assembly (13) and those of the helmet mount. The
fixing assembly is retained in the fixed position in the helmet mount by
means of retainer (14).

The transfer of the night-vision goggles from the stowed position to
the operating one, in which they are fitted on the helmet, is accomplished
by depressing button (15) with the left hand and lowering the goggles until
they are retained in the locked position. The fixing assembly is provided
with a connector, for connecting the mating connector plug of cable (16),
intended to feed power to the night-vision goggles via the voltage
converter.

Upon termination of use, the night-vision goggles are easily
removed complete with cable (16) from the mount of the helmet by
pressing down lever (17).

Page 12

NVS 6

MANUAL

Knob (18) provides a means of individual adjustment of the
monocular position (eye relief, tilt of the monocular pair optical axes, and
displacement of the monocular pair in the upward and downward
directions).

The monocular pair is locked in the selected position by moving the
knob down as far as it will go. This securely locks the monocular pair in
this position. The force applied for tightening the knob is adjustable. This
adjustment is performed after releasing the hinged joint by turning screw
(19) about its axis. To carry out the adjustment, pull out plate (20) that
retains the screw in position and turn it complete with the screw to the
next fixed position. In so doing, remember that the knob retaining force
becomes greater as the plate is turned clockwise and vice versa.

The night-vision goggles can be promptly removed from the pilot’s
field of view and transferred to the stowed position.

To do so, take hold of the monocular pair and, while overcoming
the force of retainer (21), move it fully upwards to the stowed position. As
the monocular pair is brought to a stop, the retainer will operate to hold it
up in the stowed position.

The electrical circuits, in this case, will become automatically de­energized through activation of the microswitch.

5.4.2 Voltage converter (2) is illustrated in Fig. 3.1.

The voltage converter is designed to supply power to the NVS 6 from
the helicopter electrical system.

The voltage converter consists of two separate components: low­voltage converter (LVC) (10) and cable (11) as shown in Fig. 5.1.

The LVC is a stabilized DC power source used to convert the
helicopter electrical power of 27V DC to 2.6V DC to power the unit.

Page 13

NVS 6

MANUAL

The design of the LVC is illustrated in Fig. 5.3. Structurally, the LVC
consists of casing (1), which accommodates voltage converter (2)
attached to it by means of screws (3). Cover (4) is fastened to the casing
with screws (5). Connector plug (6) serves to connect the LVC to the
helicopter electrical system of 27 V with the aid of the cable arranged on
board the aircraft.

Connector receptacle (7) is intended to connect cable (11), shown
in Fig. 5.1, to the LVC.

Connector plug (6) and connector receptacle (7) are secured to the
casing by means of screws (8) as shown in Fig. 5.3.

Gaskets (9) installed between the casing, the connector plug and
the receptacle serve to protect the LVC interior against direct entry of
moisture, whereas LVC cover (4) is filled with sealing compound for the
same purpose. Cable (11) attached to the voltage converter is connected
to cable (15) to make an electric power supply circuit of the night-vision
goggles as shown in Fig. 5.1.

The use of cables with quick-disconnect connectors makes it
possible to promptly remove the night-vision goggles from the helmet in
case of emergency.

5.5 Apart from spare dehydrator cartridge, the single set of spare
parts includes the following: test pattern, mount, casing, clamp,
counterweight, screwdriver, cloth, spare batteries or rechargeable
batteries. Spare parts availability is optional, to be specified in each
individual supply contract.

5.5.1 Test pattern (5), shown in Fig. 3.1, is designed for checking
the quality of the image of the NVS 6 (resolving power). The check
procedure is presented in 6.2.21 of this Manual.

5.5.2 The mount, shown in Fig. 5.4, is intended to secure the
NVS 6 on the helmet of the pilot or a helmet of a similar type.

Page 14

NVS 6

А

X

X

MANUAL

4

1

5

2

9

6

1 Casing
2 Voltage Converter
3 Screw

3 8 7

27 V

P1

LVG

4 Cover
5 Screw
6 Connector Plug

1

S1

7 Connector Receptacle
8 Screw
9 Gasket

Low-Voltage Converter

Figure 5.3

Page 15

NVS 6

MANUAL

3

6

1

5

7

1 Screw
2 Screw
3 Screw
4 Guides

5 Spring

2

6 Carriage
7 Carriage
8 Screw

9 Screw

8 4 9

Mount

Figure 5.4

The mount is attached to the front portion of the helmet with the aid

of three screws (1), (2), (3).

The night-vision goggles are secured to the mount by means of a
night-vision goggle plate, which is passed into the slots of guides (4) of
the mount.

The purpose of spring (5) is to reliably retain the NVS 6 on the
mount.

Page 16

NVS 6

MANUAL

Carriages (6) and (7) can be moved upwards/downwards by
rotating adjustment screw (8), as well as left/right with the aid of screw (9)
to adjust the position of the night-vision goggles relative to the pilot’s eyes.
The adjustment is performed with the use of the screwdriver, part of the
single set of spare parts.

5.5.3 Casing (8), shown in Fig. 3.1, is intended for replacing the
helmet standard casing, which makes it possible to fasten the night-vision
goggles. Three holes provided at the casing center are used for installation
of mount (7) as shown in Fig. 5.1. After attaching the casing on the
external surface of the helmet front portion with four screws (16), it
protects visor guard (17) against any possible damage. Slots (18) are
used as guides when lowering and lifting the visor guard. They help to
hold the visor guard in the required position with the use of retainer cross­shaped knob (19) moving along the slot of the casing, together with the
visor guard. While replacing the casing, the retainer cross-shaped knob
can be installed for using by the right or left hand of the pilot.

5.5.4 Clamp (9), shown in Fig. 3.1, is meant for fastening the visor
guard when replacing the standard casing for the casing found in the set
of spare parts. The clamp together with the visor guard fastened in it is
attached to the casing with the help of the retainer shown in Fig. 6.1.

5.5.5 Counterweight (10), shown in Fig. 3.1, is intended to
compensate for the tilting momentum produced by the unit.

The counterweight is essentially an individual assembly consisting
of a canvas cover with a weight contained therein. As shown in Fig. 5.1,
counterweight (9) can be quickly installed on the rear portion of the helmet
through the use of the sticking fastener. The mass of the counterweight is
620 g.

The counter weight also has a strap with a sticking fastener used
for securing night-vision goggles power cable (15).

Page 17

NVS 6

MANUAL

5.5.6 Screwdriver (4), shown in Fig. 3.1, is meant for performing
necessary readjustments of mount (7) and also used when the helmet
standard casing is replaced.

5.5.7 For removing dust, moisture and dirt from the external
surfaces of the unit, use is made of cloth (11) shown in Fig. 3.1.

5.5.8 The rechargeable batteries included in the single set of spare
parts, serve for replacement of failed or exhausted batteries of the
independent power source. The rechargeable batteries are charged by
the use of a standard battery charging unit designed for charging the AA
type rechargeable batteries in accordance with the Manual furnished with
the charging unit.

5.6 The packaging components of the NVS 6 include the case and
the set of maintenance documents (the Manual and the Log Book).

5.6.1 The case, shown in Fig. 3.1, is used for storing and carrying
the NVS 6 set. The case is provided with side pockets, which are
fastened with a zipper. One pocket holds the LVC (low-voltage converter)
and the cables, and the other one is used for holding the mount,
counterweight and screwdriver. The inner pocket is intended for
accommodating the test pattern, cloths, spare dehydrator cartridge and
batteries or rechargeable batteries. The night-vision goggles and its
accessories are delivered sealed in a polyethylene film envelope, which is
packed in the case together with the casing and clamp. The case is
closed with a flap fastened with a zipper and a sticking fastener. The case
comes complete with a carrying strap.

Page 18

NVS 6

MANUAL

6 PREPARATION FOR OPERATION

6.1 Preparation of Helmet for Mounting Night-Vision Goggles

6.1.1 Replacement of Visor Guard/Mount Assembly

6.1.1.1 Remove the standard mount assembly of visor guard (17)
(Ref. Fig. 5.1). To do this, remove four screws (16) attaching the casing to
the helmet using the screwdriver found in the set of spare parts.

6.1.1.2 To disconnect the visor guard from the standard casing:

(a) Remove screw (20) with the screwdriver by turning it clockwise.

(b) Remove cross-shaped knob (19) by hand.

(c) Remove retainer (1) (Ref. Fig. 6.1) together with the visor guard

from the standard casing slot.

(d) Remove the visor guard from the retainer by first turning

retainer tail end (2) along the visor guard slot.

6.1.1.3 Take clamp (9) shown in Fig. 3.1 from the set of spare parts.

6.1.1.4 Remove screw (3) with the screwdriver as shown in Fig. 6.2
and remove bushing (4) from the clamp hole.

6.1.1.5 insert the visor guard into clamp slot (5) accurately without
turning askew and applying much force, and fasten it using a bushing and
a screw.

6.1.1.6 Take casing (8) out of the set of spare parts. Connect the
clamp, together with the visor guard secured in it, to the casing. To do
this, insert retainer tail end (2) along recess (6) of the clamp (left-hand or
right-hand at the option of the pilot) and turn it crosswise the recess as
shown in Fig. 6.2.

6.1.1.7 Pass the retainer threaded portion through the

respective (left-hand or right-hand) slot of casing (8)
and proceed as in Steps 6.1.1.2 (b), 6.1.1.2 (a) and

6.1.1.1 observing the mentioned order.

Page 19

NVS 6

MANUAL

18

17

3

20

19

7

1 Retainer
2 Tail End
3 Screw
4 Bushing
5 Recess

5

+

4

2 1

6 Recess
7 Washer
8 Casing
9 Clamp

17 Visor Guard
18 Slot
19 Cross-shaped Knob
20 Screw

Replacement of Casing on Helmet

Figure 6.1

8

Page 20

NVS 6

MANUAL

1 2

9

6

Assembly of Clamp with Retainer

Figure 6.2

6.1.2 Installation of Counterweight

6.1.2.1 Take counterweight (10) (Ref. Fig. 3.1) from the set of spare
parts, remove the backing of the sticking fastener meant for fastening to
the helmet.

1 Retainer
2 Tail End
6 Recess
9 Clamp

6.1.2.2 Bond the removed
fastener to the rear potion of the
helmet external surface so that the
hole made at the center of the
fastener coincides with screw head
(1) (Fig. 6.3), the lower edge of the
fastener therewith should join to the
helmet rubber edging. Before bonding

Figure 6.3

with adhesive trace the outline of the
fastener on the helmet and
thoroughly remove the paint from the
helmet within the outline.

Page 21

NVS 6

MANUAL

6.1.2.3 The adhesive recommended for usage is acrylate cyanide,
type LOCTITE 454, or the like providing an adequate bonding of
fiberglass laminate with polyvinyl chloride (the adhesive sets in 2 to 3 min
and the unit may be used after a lapse of 24 h). For the bonding
procedure, refer to the Instructions for Cement Usage.

6.1.2.4 While bonding the fastener press its smooth side to the
helmet surface evenly without applying an excessive force. Apply
pressure to the fastener total area and use a screw clamp for locking the
parts to be bonded (Uniformly press the sticking fastener against the
helmet until its strip is bonded to the helmet, use should be made of the
suitable device).

6.2 Individual Adjustment and Fitting (Figs 6.4 thru 6.6)

CAUTION: EACH PILOT SHOULD CARRY OUT INDIVIDUAL

FITTING AND ADJUSTMENT OF THE NIGHT-VISION GOGGLES.

Before starting the adjustment check to see that the lenses are

closed with safety caps.

6.2.1 Remove the night-vision goggles from the case.

6.2.2 Depress button (1) (Ref. Fig. 6.4) and, while holding the fixing
assembly in one hand, take monoculars (28) and (29) in the other hand,
transfer the goggles to the operating position so that the fixing assembly
is straightened. In doing so, see that only a slight force is applied to
securely lock (latch) the monocular pair in the operating position,
indicated by a click of retainer (21) (Ref. Fig. 5.2).

CAUTION: IN THE EVENT OF FAILURE OF THE RETAINER TO
LATCH THE MONOCULAR PAIR IN THE OPERATING POSITION, THE
NIGHT-VISION GOGGLES WILL NOT BE ENERGIZED AND THE
INDIVIDUAL ADJUSTMENT WILL NOT BE POSSIBLE.

6.2.3 To ensure proper latching, essential for retaining the
monocular pair in the operating position, check to see that the hinged joint
linking the monocular pair to the unit fixing assembly is reliably locked.

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NVS 6

MANUAL

Should the monocular pair fail to be locked relative to the unit fixing

assembly, proceed as follows:

– Move knob (2) (Ref. Fig. 6.4) to the top position (the hinged joint,

in this case, will be fully released).

– Pull out plate (3), which retains screw (4) in the locked position,
with your thumb and forefinger, turn it to the next locking position in the
clockwise direction and release the plate. The plate shall be set to a new
locking position (Ref. Step 6.2.2).

– This done, lock the hinged joint linking the monocular pair to
the unit fixing assembly again by applying an effort to knob (2) so as to
bring it down as far as it will go.

If the monocular locking continues to fail, carry out the above
procedure one more time.

6.2.4 Take power supply components (two batteries of type size AA
R6 1.5V or rechargeable batteries) out of the case. When using the
rechargeable batteries, first charge them in accordance with the Manual
furnished with the battery-charging unit.

6.2.5 Insert two batteries into the recess of guide (8) with the positive
contact directed inwards by first unscrewing and removing cap-switch (5),
and then screw it in fully in the clockwise direction.

6.2.6 Release knob (2) and set the top portion of the fixing assembly
perpendicular to the axes of monocular (28) and monocular (29). While
holding the fixing assembly in one hand, displace the monocular pair with
the other hand forward and downward until they are butted up against the
cruciform guides of the fixing assembly. Once completed, tighten the
knob to lock the monocular pair in the desired position.

WARNING: NEGLECT OF THE REQUIREMENTS DESCRIBED IN
THE ABOVE STEP MAY RESULT IN EYE INJURY DURING THE
COMPLETION OF FURTHER PREPARATORY OPERATIONS.

Page 23

NVS 6

MANUAL

18

2

29

3

4

1 Button
2 Knob
3 Plate
4 Screw
5 Cap-switch
6 Cap
7 Button
8 Guide

14 16 26 12 27 13 16 27 1 11

28 8 7 6 5

9 Counterweight
10 Strap
11 Cross-head Knob
12 Guide
13 Retainer
14 Cable
15 Visor Guard

16 Screw
18 Lever
25 Connector
26 Mount
27 Screw
28 LH Side Monocular
29 RH Side Monocular

9

10

25

Installation of Night-Vision Goggles on Helmet in Operating Position

Figure 6.4

Page 24

NVS 6

MANUAL

17

5
4
3
1
18

2 12 13 16 14

27
26

27

9

10

1 Button
2 Knob
3 Plate
4 Screw
5 Cap-switch
9 Counterweight

10 Strap
12 Guide
13 Retainer
14 Cable
16 Screw

17 Ring
18 Lever
25 Connector
26 Mount
27 Screw

Night-Vision Goggles Installed on Helmet in Stowed Position

Figure 6.5

25

Page 25

2

1 Button
2 Knob
3 Plate
4 Screw

NVS 6

MANUAL

7 Button
12 Guide
13 Retainer
16 Screw

26

3

4

7

18 Lever
26 Mount
27 Screw

12

16

13

27

1

18

Installation of Night-Vision Goggles on Helmet and Their Adjustment

Relative to Pilot’s Eyes

Figure 6.6

Page 26

NVS 6

2

2

MANUAL

20

24

21

1

13

1

15

15

14

22 23 19

1 Button
12 Guide
13 Retainer
14 Cable

19 LVC (Low-Voltage Converter)
20 Cable
21 LVC Power Cable Running from

Helicopter Electrical System

22 Receptacle
23 Plug
24 Spring Clamp
25 Connector

Connection of Night-Vision Goggles to Helicopter Electrical System Via
Voltage Converter
Figure 6.7

6.2.7 Position the eyepieces of the goggles at eye level, turn on the

night-vision goggles by turning cap (6) of cap-switch (5) in the

Page 27

NVS 6

MANUAL

counterclockwise direction until it is retained in the ON position and check
to see that the unit operates properly. In so doing, see to it that the
image-intensifier tube screens start glow steadily in amber-green
(without flashes and twinkling) in the monocular pair of the night-vision
goggles.

CAUTION: TO SAFEGUARD THE UNIT AGAINST DAMAGE, MAKE
ABSOLUTELY SURE THAT THE SAFETY CAPS ARE FITTED ON THE
LENSES WHEN THE NIGHT-VISION GOGGLES ARE TURNED ON IN
THE PRESENCE OF LIGHT.

6.2.8 Depress button (7) and displace LH side monocular (28) with
respect to the immobile RH side monocular, along guide (8) to
preliminarily select the optimum distance between the eye pupils in
accordance with the interpupilary distance of the operator. Release button
(7) and the LH side monocular will be locked in the selected position.

6.2.9 Turn cap (6) of cap-switch (5) in the clockwise direction as far
as it will go to de-energize the night-vision goggles.

6.2.10 Take hold of the monocular pair with one hand and the fixing
assembly with the other hand, and transfer the night-vision goggles to the
stowed position as shown in Fig. 6.5 (i.e. fold up the fixing assembly by
overcoming the retainer force that locks the goggles in the operating
position).

6.2.11 Remove mount (26), part of the single set of spare parts,
designed for attaching the night-vision goggles, from the outer pocket of
the case and install it on the front portion of the helmet. To do so, insert
three screws (27) into the threaded holes in the helmet casing and tighten
them.

6.2.12 Remove counterweight (9) (Ref. Fig. 6.4) from the outer
pocket of the case, install it on the rear portion of the helmet and secure it
by means of the sticking fastener.

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NVS 6

MANUAL

6.2.13 Carry out preparatory operations on the pilot’s helmet in
compliance with the Manual. Loosen cross-shaped knob (11) and use it to
move visor guard (15) fully so that the visor guard is retracted under the
casing. These done, fix the visor guard in this position by tightening the
cross-shaped knob.

6.2.14 Install the night-vision goggles, which are currently placed in
the stowed position, onto the helmet (with the helmet removed from the
head), by joining the fixing assembly of the night-vision goggles to the
helmet mount. To do so, insert the plate of the fixing assembly of the
night-vision goggles into the slots of guide (12) (Ref. Fig. 6.4) of helmet
mount (26). Exercise due care to avoid misalignment, then, turn the plate
upwards until retainers (13) become latched.

6.2.15 Attach cable (14) to the helmet by first passing it under
unfastened strap (10) on counterweight (9) and then fasten the strap
using the sticking fastener.

6.2.16 Secure the helmet, complete with the goggles placed in the
stowed position, on the pilot’s head.

6.2.17 Transfer the goggles to the operating position (Ref. Step 6.2.2
of this Manual) and turn them on (Ref. Step 6.2.7 of this Manual).

6.2.18 Set RH side monocular (29) precisely opposite the right eye
of the pilot. To do so, ease up knob (2) and displace the monocular pair of
the night-vision goggles in the cruciform guides of the fixing assembly
upward or downward, forward or backward. Simultaneously turn them
about the axis of knob (2) to find the optimum position at which the NVS 6
monocular pair is properly set away from the eyes and their optical axes
have the required tilt.

By an optimum position of the monocular pair relative to the pilot’s
eyes, is meant, a position that provides adequate conditions for carrying
out observation of the full field of view of the RH side monocular with the

Page 29

NVS 6

MANUAL

right eye, as well as clear view of the surrounding space by shifting gaze
downwards under the eyepieces of the night-vision goggles.

Note – If the RH side monocular of the night-vision goggles fails to
be set to the position at which the sighting line of the pilot’s eye passes
through its center, the position of the RH side monocular shall be
corrected by moving the night-vision goggles upwards or downwards,
right or left relative to the helmet. To do so, the carriages of helmet mount
(26) should be shifted by the adjustment of screws (16) utilizing the
screwdriver provided (Ref. Fig. 6.6). On completion of the corrective
actions, perform the operations described in this step once again.

6.2.19 Carry out the operations prescribed by Step 6.2.8 of this

Manual to finally adjust the interpupilary distance.

Make sure that the full field of view of the night-vision goggles is
provided for both eyes.

6.2.20 Adjust the eyepieces to the appropriate dioptric sighting by
turning rings (17) (Ref. Fig. 6.5) of the eyepieces until a sharp structural
image of the screens on the image-intensifier tubes is attained.

6.2.21 Evaluate the operational status of the night-vision goggles
by checking the image quality (resolving power). For this purpose, take a
test pattern, from the single set of spare parts and arrange it at a distance

of an outstretched hand away from the lenses ((750±16) mm). The
settings of the night-vision goggles are considered to be normal if the test
pattern lines are clearly visible and the check text is readable. Both
monoculars should operate without flashes and twinkling.

CAUTION: THE SERVICEABILITY CHECK OF THE NIGHT­VISION GOGGLES SHALL BE ACCOMPLISHED IN THE PRESENCE
OF LIGHT WITH THE LENSES COVERED BY THE SAFETY CAPS.

6.2.22 De-energize the night-vision goggles (Ref. Step 6.2.9 of this

Manual).

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NVS 6

MANUAL

6.2.23 Check the operation of the mechanism permitting
emergency removal of the night-vision goggles from the helmet. To test,
depress levers (18) (Ref. Fig. 6.4) of the fixing assembly with the thumb
and forefinger and simultaneously pull the night-vision goggles promptly
downwards. As the night-vision goggles become released from the guide
on the helmet, keep on moving your hand to the left and right side to
disengage the power cable from the helmet. The night-vision goggles shall
easily separate from the mount of the helmet and remain in the pilot’s
hands.

Regardless of the position, operating or stowed, the night-vision

goggles will be easily removed.

WARNING: THE NIGHT-VISION GOGGLE REMOVAL TO BE
PERFORMED IN THE EVENT OF AN EMERGECY ESCAPE FROM THE
HELICOPTER MUST BE THOROUGHLY PRACTICED BY THE PILOT
ON THE GROUND TO ENHANCE HIS SAFETY IF EMERGENCY
ESCAPE FROM THE COCKPIT SHOULD BE NECESSARY.

6.2.24 Transfer the night-vision goggles to the stowed position as

instructed in Step 6.2.10 of this Manual.

6.2.25 Take out the used batteries from the night-vision goggles.

6.2.26 Take off the helmet and detach counterweight (9).

6.2.27 Place the night-vision goggles into the case and put the

counterweight into the outer pocket.

6.2.28 Discharge the rechargeable batteries, if any, and recharge
them, using a standard charging unit designed for charging the
rechargeable batteries of type size AA 1.5 V in accordance with the
Manual furnished with the unit.

6.2.29 Place the batteries (including rechargeable batteries) into
the inner pocket of the case.

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NVS 6

MANUAL

6.3 Arrangement of Night-Vision Goggles on Helicopter (Figs

6.4 thru 6.7)

6.3.1 Remove the following components from the case (Ref. Fig.

3.1): night-vision goggles (1), batteries (6) (2 pcs), mount (7), counterweight
(10), voltage converter (2) complete with LVC (low-voltage converter) (10)
(Ref. Fig. 5.1), and cable (11).

6.3.2 Secure LVC (19) (Ref. Fig. 6.7) in the place allotted for it in

the cockpit and connects it to the helicopter electrical system by making
use of airborne power cable (21) (engage receptacle (22) with LVC
plug (23)).

6.3.3 Attach cable (20) with the aid of spring clamps (24) in the

cockpit.

6.3.4 Install mount (26) found in the single set of spare parts (Ref.

Fig. 6.6, Step 6.2.11) onto the front portion of the helmet.

6.3.5 Install counterweight (9) (Ref. Fig. 6.5, Step 6.2.12) onto the

rear portion of the helmet.

6.3.6 Insert batteries into the special recess on the night-vision

goggles (Ref. Step 6.2.5 of this Manual) to ensure independent power
supply of the goggles.

6.3.7 Install the night-vision goggles on the helmet (with the helmet

removed from the head) in the stowed position (Ref. Fig. 6.5), for this
purpose; join the fixing assembly of the night-vision goggles to mount (26)
of the helmet (Ref. Fig. 6.6). Using extreme care, insert the fixing
assembly plate of the night-vision goggles into the slots of guide (12) of
helmet mount (26) avoiding misalignment and shift the plate upwards until
retainers (13) become latched.

Prior to installation, the night-vision goggles shall be adjusted to fit

the eyes of a pilot as instructed in Section 6.2 of this Manual.

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NVS 6

MANUAL

6.3.8 Fasten cable (14) on counterweight (9) using strap (10) (Ref.

Fig. 6.5, Step 6.2.15).

6.3.9 With the goggles placed in the stowed position secure helmet

soundly on the pilot’s head.

6.3.10 Connect cable (14) to cable (20) with the use of the connector

(25) (Ref. Fig. 6.7).

6.3.11 Turn on the switch to apply the helicopter electrical power to

the night-vision goggles.

6.3.12 Depress button (1) (Ref. Figs 6.4, 6.5) and, while holding the
fixing assembly with one hand and taking hold of the monocular pair with
the other hand, transfer the goggles to the operating position so that the
fixing assembly becomes straightened. In doing so, see to it that only
slight effort is applied for ensuring proper locking (latching) of the
monocular pair in the operating position. Only an effort sufficient to cause
operation of retainer (21) is necessary. (Ref. Fig. 5.2). The goggles will
get energized.

This done, the pilot shall see amber-green illumination free from
flashes and twinkling on the screens of both channels of the night-vision
goggles, which is indicative of normal operation of the goggles powered
from the helicopter electrical system.

Note – When the night-vision goggles are powered from the
helicopter electrical system, they are energized and de-energized
automatically in response to their transfer from the stowed to the
operating position and vice versa irrespective of the position of cap (6) (Ref.
Fig. 6.4) of cap-switch (5).

CAUTION: 1 WHEN THE NIGHT-VISION GOGGLES ARE
SWITCHED ON IN THE PRESENCE OF LIGHT OR WITH THE WHITE
FLOOD LIGHT TURNED ON, MAKE ABSOLUTELY SURE THAT THE
SAFETY CAPS ARE FITTED ON THE LENSES TO PREVENT DAMAGE
OF THE UNIT.

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NVS 6

MANUAL

2 IF THE POWER SUPPLY OF THE GOGGLES FROM THE
HELICOPTER ELECTRICAL SYSTEM IS NOT AVAILABLE, THEIR
OPERATION MAY BE PROVIDED FROM THE INDEPENDENT BUILT-IN
POWER SOURCE (TWO BATTERIES AA R6 1.5 V OR
RECHARGEABLE BATTERIES OF A SIMILAR TYPE).

6.3.13 If the alignment of the monoculars of the night-vision
goggles with respect to the eyes of the pilot is not accurate enough and
the monocular pair is not adjusted to suit individual features of his
eyesight, perform the adjustment operations as prescribed by Steps 6.2.19,

6.2.20 of this Manual.

Now the goggles are ready for work.

Upon completion of work with the goggles, carry out the following

operations:

6.3.14 Take hold of the monocular pair with one hand and the fixing
assembly with the other hand and transfer the night-vision goggles to the
stowed position (i.e. "fold up" the fixing assembly by overcoming the force of
the retainer which locks the goggles in the operating position).

6.3.15 Turn off the switch used for supplying power from the
helicopter electrical system to the night-vision goggles.

6.3.16 Disconnect cable (14) (Ref. Fig. 6.7) from cable (20) by
disengaging the connector (25).

6.3.17 Take off the helmet complete with the night-vision goggles
installed and detach the counterweight from the helmet.

6.3.18 Remove the night-vision goggles from the helmet by pulling
them down by hand, having pressed levers (18) (Ref. Fig. 6.4) to disengage
the goggles fixing assembly plate from the guides of mount (26) of the helmet.

6.3.19 Remove screws (27) and remove mount (26) from the helmet.

6.3.20 Remove the used batteries from the night-vision goggles.

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NVS 6

MANUAL

6.3.21 Disconnect power cable (21) (Ref. Fig. 6.7) of the helicopter
electrical system from the LVC (low-voltage converter), and disengage
cable receptacle (22) from plug (23) of the LVC.

6.3.22 Remove the LVC (complete with cable (20)).

6.3.23 Put the night-vision goggles into the case. Do not put the
rechargeable batteries into the case.

6.3.24 Discharge and recharge the rechargeable batteries in
conformity with the Instructions presented in the Manual furnished with
the standard battery-charging unit.

6.3.25 Pack the batteries and the rechargeable batteries after being
charged into the case.

Page 35

NVS 6

MANUAL

7 OPERATION PROCEDURE

7.1 The conditions in which the night-vision goggles are operated
have their own idiosyncrasy, which requires certain skills on the part of
the pilot as the image of the terrain and objects visible through the night­vision goggles is monochromic and not very soft.

7.2 The night-vision goggles enable the pilot not only to nap off the
earth but also view the instrument panel by taking a look downwards or
sideways past the eyepieces.

CAUTION: WHEN THE NVS 6 IS USED AT NIGHT TIME, THE

SAFETY CAPS SHALL BE REMOVED FROM THE LENSES.

7.3 For removing the safety caps, press simultaneously on both
retainers and, while holding them depressed, take the cap off of the lens
mount. Put the removed caps into the case pocket.

7.4 After removing the safety caps, focus the lenses of each
monocular by rotating the lens about its optical axis so as to attain the
sharp image of the viewed objects in the space outside the cockpit (for
convenience of rotation each lens is provided with knurling).

7.5 In case that the airborne power supply is not available, turn on
the independent power source to feed power to the night-vision goggles
by turning cap (6) of cap-switch (5) (Ref. Fig. 6.4).

7.6 If the night-vision goggles become exposed to bright light, turn
your head to divert the lenses sideways so as to bring the image of bright
light sources outside the field of view.

7.7 In the event of fogging of the eyepieces of the night-vision
goggles (low temperature), pull the goggles out of the operating position
and wipe dry the external surfaces of the eyepieces with a cloth included
in the single set of spare parts.

7.8 After long usage of the night-vision goggles on the pilot’s head
(more than 2.5 h), the pilot may feel a light fatigue in the neck muscles.

Page 36

NVS 6

MANUAL

7.9 Upon completion of work with the night-vision goggles and after
the helicopter landing, perform the operations prescribed by Steps 6.2.14
thru 6.2.25. If need be, clean the night-vision goggles and their
accessories from dust, dirt and traces of moisture with the cloth included
in the single set of spare parts.

7.10 The preparation of the night-vision goggles for the next flight
consists in replacement of the rechargeable batteries used in flight with
newly charged ones and accomplishment of operations in accordance with
Table 5.

7.11 Prior to an emergency evacuation of the helicopter, depress
levers (18) (Ref. Fig. 6.4) of the fixing assembly with the left (right) hand
thumb and forefinger and promptly pull the night-vision goggles down. As
the goggles become disengaged from the guide on the helmet, keep on
moving your hand to the left or right side until the power cable gets
disconnected from the helmet.

The subsequent operations shall be carried out in compliance with
the "Helicopter Crew Instructions" that specify the procedures for the night­vision goggles usage during flights.

Page 37

NVS 6

MANUAL

8 OPERATIONAL STATUS CHECK

8.1 In the course of the NVS 6 service, it is essential to continually
carry out its inspection. The inspection shall be accomplished during all
kinds of maintenance checks with the aim of determining the unit
operational status, and detecting in due time its defects and their
correction. The operational status of the unit is exemplified by its
serviceability, completeness of its standard set, and readiness for use.

8.2 The list of the basic checks of the NVS 6 and its accessories
for operational status (inspection procedures) is presented in Table 3.

Table 3

Procedure Inspection method Technical requirements

1 Unit standard
set inspection for
full complement

2 External
inspection of
the unit and its
accessories

3 Serviceability
test of the unit and
its accessories

Table 3, cont'd

Check the standard
delivery set against
the list of the unit com­ponents in the Log
Book.

Inspect the unit for
external condition (vi­sually).

The procedure for
serviceability test is
described in Section 6
of this Manual.

The unit standard set
shall comply with the
standard delivery set
specified in the NVS 6 Log
Book.

The external surfaces of
the unit and its accessories
shall not be affected by
cracks, dents, traces of cor­rosion and other defects.

The lenses and
eyepieces shall be free
from cracks, spots of
grease and dirt.

With the unit energized
(either from the helicopter
electrical system via the
voltage converter, or from

Page 38

NVS 6

MANUAL

Procedure Inspection method Technical requirements

IPS), the image-intensifier

tube screens shall
illuminate and, after dioptric
adjustment of
the eyepieces (Ref. Step

6.2.20) and focusing of the
lenses (Ref. Step 7.4),
nearby objects shall be
clearly seen in the unit field
of view.

4 Quality of
image viewed by
unit

9 TROUBLE SHOOTING

9.1 Normal operation of the NVS 6 is substantiated by the following

indications:

(a) Feasibility of observing the illumination of the screens (without
flashes and twinkling) of each of the two image-intensifier tubes through
the eyepieces.

(b) Clear visibility of nearby objects and the test pattern lines in
the course of preflight preparation.

9.2 All these signs are indicative of the adequate operational status

of the NVS 6 for ensuring its normal functioning.

9.3 The list of the most frequent and probable troubles of the NVS

6 is given in Table 4.

The check is
conducted by the pilot
in the course of
individual adjustment
of the night-vision
goggles (Ref. Step

6.2.21)

The unit shall provide for
distinct identification of the
test pattern lines in all four
directions and easy reading
of the check text, which is
indicative of the fact that
the unit is ready for use.

Page 39

NVS 6

MANUAL

Table 4

Trouble

and

symptoms

1 NVS 6 failure
to operate
(image-intensifier
tube screens are
not illuminated)

2

Probable

cause

1 Polarity of
connected
rechargeable
batteries is not
observed

Rechargeable
batteries
(batteries) are
discharged or
unserviceable

Correction

1 Remove
rechargeable
batteries and then
fit them in so that
the positive lead
marked with "+" is
directed inwards
into guide (2) (Ref.
Fig. 5.2)

1 Charge
rechargeable
batteries on the bat­tery charging unit
as instructed in the
Manual furnished
with

Remarks

Can be
performed in
the field

Can be
performed in
the field

Trouble

and

symptoms

The unit, or replace

Probable

cause

failed rechargeable
batteries or batteries
with serviceable
ones included in
the single set of

Remedy

Remarks

Page 40

NVS 6

MANUAL

Trouble

and

symptoms

3 Presence

4 LVC or

Probable

cause

of moisture
inside the unit

cable are out
of order

spare parts

1 Replace dehyd­rator cartridge (13)
(Ref. Fig. 5.1), by
first inspecting the
color of silica gel
indicator through
sight glass (14).
Replace the silica
gel, when its color is
turned lilac or rosy

1 Forward the unit
for repair

Remedy

Remarks

Can be
performed in
the field

To be
performed at a
repair shop or
at Manu­facturer’s
facilities

5 Image-

intensifier tube
is out of order

1 Forward the unit

for repair

To be
performed at a
repair shop or
at Manu­facturer’s
facilities

Page 41

NVS 6

MANUAL

Trouble

and

symptoms

2 Image of
viewed objects is
not sufficiently
sharp

2 Unit is out

Probable

cause

1 Dirt on
external
surfaces of
the unit lens,
eyepiece

of focus
(dioptric
setting of
eyepieces has
not been
performed,
lenses have
not been
focused)

Remedy

1 Wipe clean
external surfaces of
lens (1) (Ref. Fig. 5.1)
and eyepiece (2)
with cloth (11) (Ref.
Fig. 3.1) included in
the single set of
spare parts

1 Adjust properly
sharpness of image
by rotating eyepiece
(2) (Ref. Fig. 5.1)
with the aid of
adjustment ring (3).

2 Bring the image
viewed in lenses (1)
(Ref. Fig. 5.1) into
sharp focus as
instructed in Step

7.4

Remarks

Can be
performed in
the field

Can be
performed in
the field

3 Lens or
eyepiece is af­fected by phy-

1 Forward
the unit for
repair

To be

performed at a
repair shop or

Page 42

NVS 6

MANUAL

Trouble

and

symptoms

sical damage repair at Manu-

3 One of the
image-intensifier
tube screens is
not illuminated.

Visible on the
screen are black
dots that tend to
grow to a
dimension of a
segment

4 With the unit
energized, drops
of moisture are
visible on optical
surfaces in the
field of vision of
the eyepiece

Probable

cause

1 The
image­intensifier tube
is unser­viceable

1 Moisture
has got inside
the unit (failure
of the eye­piece sealing)

1 Forward the unit

for repair

1 Replace
dehydrator cartridge
(13) (Ref. Fig. 5.1),
by first inspecting
the color of silica gel
indicator through
the sight glass (14).
Replace silica gel

Remedy

Remarks

facturer’s
facilities

To be
performed at a
repair shop or
at Manu­facturer’s
facilities

Can be
performed in
the field

Page 43

NVS 6

MANUAL

Trouble

and

symptoms

5 Night-vision
goggles are not
properly secured
on the mount of
the helmet

Probable

cause

1 Fixing
assembly of
the night-visi­on goggles is
out of order

Remedy

when its color has
changed to lilac or
rosy

1 Forward the unit

for repair

Remarks

To be
performed at a
repair shop or
at Manu­facturer’s
facilities

Page 44

NVS 6

MANUAL

10 MAINTENANCE PRACTICES

10.1 The maintenance operations to be carried out on the NVS 6
constitute the essential part of the unit operation and their correct
performance can significantly prolong the unit service life and keep it
always ready for use.

10.2 For maintaining the NVS 6 at constant readiness for service,
provision is made for the following line maintenance procedures (preflight
checks):

(1) Preliminary preparation.

(2) Preflight preparation.

(3) Preparation for the next flight.

(4) Post flight procedures.

10.3 The maintenance operations and checks stipulated by the
above maintenance practices are presented in Table 5.

Table 5

Line maintenance procedures

(preflight checks)

Subject of maintenance

and operations

1 Storage battery charging in
accordance with the Manual
furnished with the battery charging
unit (in using rechargeable
batteries) or replacement of
batteries

2 Cleaning external surfaces of
the lens and eyepiece in
compliance with the procedure
prescribed by this Manual

Prelimi-

nary

preparat

ion

Preflight

prepara-

tion

Prepara-

tion for

next

flight

Post-

flight

proced

ures

+ – – –

+ – – –

Page 45

Table 5, cont'd

Line maintenance procedures

NVS 6

MANUAL

(preflight checks)

Subject of maintenance

and operations

Prelimi-

nary

preparat

ion

Preflight

prepara-

tion

Prepara-

tion for

next

flight

3 Inspection:

Inspection of the night-vision

+ + + +
goggles and their accessories for
external condition as instructed in
Section 8:

Checking the unit set for

+ – – +
completeness

Checking the night-vision

+ + + +
goggles and their accessories for
external condition

Testing the night-vision goggles

+ + + +
for serviceability

Checking the night-vision

+ – – –
goggles for image quality

4 Preparation of the unit for

use in compliance with Section 6:

Post-

flight

proced

ures

Individual adjustment and fitting

of the unit

Arrangement of the night-vision

goggles on the helicopter

5 Concluding operations on

the unit as per Sections 6, 7

+ – – –

– + – –

+ – – +

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NVS 6

MANUAL

10.3.1 For cleaning the outer surfaces of the lenses and eyepieces,
wipe them with a clean cloth included in the single set of spare parts, by
first blowing off grains of sand and dust from the surfaces.

In case of severe contamination of the optical parts, do their

cleaning as follows:

– Obtain a Q-tip (used for ears cleaning). If not available, wind
a small amount of cotton wool around the end of a wooden stick, after
having sharpened the stick end

– Moisten the cotton wool (or Q-tip) with alcohol or ether, or their
mixture and then shake the stick to remove excess of liquid;

– Wipe the glass with the cotton wool (or Q-tip) several times
without touching the eyepieces with hands

– Replace the cotton wool (or Q-tip) with a dry one and perform
circular strokes with the cotton wool moving it from the center to the edge to
finish the cleaning.

It should be remembered that the unit should be de-energized
during the process of optical surfaces cleaning. Perform cleaning of the
monocular pair, fixing assembly and unit accessories to remove dust, dirt,
etc. (if any).

10.4 In the course of service and storage of the NVS 6, it is

necessary to ensure replacement of the independent power source.

10.4.1 The rechargeable batteries shall be replaced on expiration
of the guarantee period of their service life, whereas the batteries shall be
replaced as they are run down.

10.5 The periodic maintenance checks (scheduled maintenance
procedures) meant for maintaining the unit in the serviceable condition
throughout the entire service life shall be conducted within the single time
intervals as determined by the total flying time (Ref. Table 6).

Note – Information on the service time limits and man-hours to per-

form the maintenance checks is presented in the helicopter Manual.

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NVS 6

MANUAL

Table 6

Procedure

and parameter under

check

1 Cleaning lens and
eyepiece external
surfaces

2 Inspection:

Inspecting the night­vision goggles and their
accessories for external
condition

Checking the unit set
for completeness

Testing the night-vision
goggles and their
accessories for
serviceability

Checking the night­vision goggles for image
quality (resolving power)

Maintenance check intervals, hours (months)

50

(6 months)

+ + +

+ + +

+ + +

+ + +

+ + +

100

(12 months)

200

(24 months)

3 Periodic inspection:

Checking screws for
proper tightness and
inadvertent loosening

Adjustment of retainers
force for locking in
operating position (if
required)

+ + +

+ + +

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NVS 6

MANUAL

required)

10.6 The inspection procedure shall be performed as specified in

Table 3.

10.7 The image quality shall be tested in compliance with Step 6.2.21.

10.8 The screws shall be checked for proper tightness, slipping and
inadvertent loosening with the aid of the screwdriver, included in the set of
spare parts.

When carrying out this check, make sure that the screws
completely secure the joints between parts and assemblies. Screw
slippage and loosening are inadvisable.

10.9 The adjustment of force of retainer (21) (Ref. Fig. 5.2) shall be

accomplished by turning the retainer attachment screw.

When the screw is turned, the retaining force changes (retainer
spring pressing force).

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NVS 6

MANUAL

11 STORAGE AND SHIPMENT

11.1 The NVS 6 units should be stored in heated premises at
a temperature of +5 to +40
of 80 %.

11.2 Maintenance of the units, while at store, shall be performed as
instructed in Section 10 of this Manual.

11.3 Perform preservation of the unit before placing it for prolonged
storage. The preservation is done by the use of lamination method
(the units are sealed in a polyethylene bags).

On the expiry of three years since preservation, the unit shall be

subject to repeated preservation.

11.4 The NVS 6 can be shipped by any type of transport and over
varied distances, provided proper packaging is in place.

During transportation the package that contains the case with

the unit shall be securely protected against shocks and dropping.

The case shall be placed in the package with the top cover directed

upwards and carefully fastened.

CAUTION: AVOID DROPPING THE PACKAGE WITH THE UNIT

DURING LOADING AND UNLOADING OPERATIONS.

o

C and a relative air humidity of not in excess

Page 50

NVS 6

MANUAL

APPENDIX A

List of Illustrations

(reference)

Fig. Title Page

3.1 NVS 6 Standard Set 6

5.1 NVS 6 9

5.2 Night-Vision Goggles 11

5.3 Low-Voltage Converter 15

5.4 Mount 17

6.1 Replacement of Casing on Helmet 20

6.2 Assembly of Clamp with Retainer 21

6.3 21

6.4 Installation of Night-Vision Goggles on Helmet in
Operating Position

6.5 Night-Vision Goggles Installed on Helmet in Stowed
Position

6.6 Installation of Night-Vision Goggles on Helmet and Their
Adjustment Relative to Pilot’s Eyes

6.7 Connection of Night-Vision Goggles to Helicopter
Electrical System Via Voltage Converter

24

25

26

27

Page 51

APPENDIX B

List of Abbreviations

(reference)

FOV – Field of view

IPS – Independent power source

LVC – Low-voltage converter

Page

52

NVS 6

MANUAL

WARRANTY:

NEWCON OPTIK warrants this product against defects in material and

workmanship for one year from the date of the original date of consumer's
purchase, but no more than 18 months from the date of manufacturing. Should
your Newcon product prove defective during this period, please bring the product
securely packaged in its original container or an equivalent, along with proof of
the date of original purchase, to your Newcon Dealer. Newcon will, replace or
repair (or at its option replace), the product or part thereof, which, on inspection
by Newcon, is found to be defective in materials or workmanship.

What This Warranty Does Not Cover:

NEWCON is not responsible for warranty service should the product fail to be

properly maintained or fail to function properly as a result of misuse, abuse,
improper installation, neglect, damage caused by disasters such as fire, flood,
lightning, improper electrical current, or service other than by a NEWCON
Authorized Service. Postage, insurance, or shipping costs incurred in presenting
your NEWCON product for warranty service are your responsibility. Please
include a cheque or money order made out to NEWCON OPTIK for the amount
of $15.00 to cover shipping and handling within Canada or the U.S.A. Shipping
to other destinations will be done at the customer’s expense.

8.

Customer Support

Should you experience any difficulties with your Newcon OPTIK product, consult
the enclosed manual. If the problem remains unresolved, contact our customer
support department at [phone] or Toll free at 1-877-398-6666. Our
operating hours are 9am-5pm, Monday - Friday, standard East time. At no time
should equipment be sent back to Newcon without following the instructions of
our technical support department.
Newcon accepts no responsibility for unauthorized returns.

To locate the NEWCON Authorized Dealer call:

Tel: [phone] Fax: [phone]

Email: [e-mail]

INTERNET: http://WWW.NEWCON-OPTIK.COM

The defective products should be shipped to:

In USA: 3310 Prospect Ave. Cleveland, OH 44115

From other countries : 1183 Finch Ave. W., Suite 302, Toronto, ON M3J 2G2

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MANUAL

Page 54