ACR Electronics MS-2000M User Manual

PRODUCT

SUPPORT

MANUAL

Y1-03-0146

Rev. D

MS-2000 (M)

Product No. 3990

Distress Marker Light

ACR Electronics, Inc.

5757 Ravenswood Road

Fort Lauderdale, Fl 33312

[phone] • Fax [phone]

www.acrelectronics.com

Email: [e-mail]

A Chelton Group

Company

TABLE OF CONTENTS

1. GENERAL............................................................................................................................. 3

2. PURPOSE.............................................................................................................................. 3

3. GENERAL CHARACTERISTICS..................................................................................... 3

4. OPERATING INSTRUCTIONS......................................................................................... 3

5. PERFORMANCE TESTING..............................................................................................4

6. TEST EQUIPMENT AND TOOLS....................................................................................6

7. THEORY OF OPERATION ............................................................................................... 6

8. MAINTENANCE REQUIREMENT ..................................................................................6

9. PREVENTIVE MAINTENANCE CHECKS..................................................................... 6

10. ALIGNMENT ....................................................................................................................... 7

11. PERIODIC INSPECTION REQUIREMENTS................................................................. 7

12. REPLACEMENT PARTS LIST .........................................................................................7

13. PARTS REPLACEMENT PROCEDURE......................................................................... 7

FIGURE 1.......................................................................................................................................7

FIGURE 2.......................................................................................................................................8

FIGURE 3.......................................................................................................................................9

FIGURE 4.....................................................................................................................................10

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Y1-03-0146 Rev. D

1. General

This publication provides maintenance and operating instructions for the MS-2000(M)
Distress Marker Light.

2. Purpose

The light is designed and intended to provide aircrew and other personnel with a high­intensity visual distress marker signal for use in the event of unscheduled abandonment
of aircraft in isolated regions and other emergency and/or special operational mission
situations.

3. General Characteristics

a. The MS-2000(M) Distress Marker Light is a lightweight, compact, battery

operated, portable unit that is designed to be used as a multi-functional light
during emergency and/or clandestine special mission situations. The light is
designed to attract attention; to assist in location; and to facilitate personnel
rescue operations in both overt and covert operations.

b. The light system consists of a main body case containing the electronics, lamp,

batteries and the flashguard (FG) shield containing one Infra Red (IR) and one
blue filter. The flashguard also has raised battery polarity indicators to assist in
non-visual battery replacement. The case is fabricated of high impact, cut
resistant thermoplastic material and designed to insure watertight integrity of the
main body case. The light utilizes a xenon strobe lamp, is powered by two AA
batteries and is actuated by a magnetic reed switch. The light is designed for one­handed operation and may be operated by either hand or attached to any object.

c. The flashguard shield contains both an IR and Blue filter which are used as

safeguards in hostile territories so as to prevent possible signaling confusion (i.e.,
small arms ground fire) between the signaler and observer. The IR filter provides
omni-directional transmission of IR wavelengths. The Blue filter is used for line­of-sight (directional) light transmissions. The IR filter is designed for use during
clandestine operations.

d. Electrical power for the MS-2000(M) is provided by two 1.5V, AA, alkaline

batteries located in the base of the main body case. A retained battery door is
provided with an "O" ring seal to insure its watertight integrity. Additionally,
electrical power is controlled by a magnetic reed switch located on the side of the
main body case. This switch also insures waterproof integrity of the main body
case.

4. Operating Instructions

a. Turn "ON". Slide switch up until it stops. The strobe should begin flashing

within a few seconds.

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Y1-03-0146 Rev. D

b. Turn "OFF". Slide switch down until it stops. The unit will stop operating.
c. White Light. With the flashguard shield in the retracted (stored) position, slightly

raise the IR filter and rotate it either left/right 90°, push filter in to lock into place.
(Figure 2)

d. IR Light. With the flashguard shield in the retracted (stored) position, insure that

the IR filter is resting on the top (vertical) end of the light over the clear lens, then
push filter down to lock into place. (Figure 3)

e. Blue Light. With the flashguard shield in the retracted (stored) position, slightly

raise the IR filter and rotate it either left/right 90°. Then snap it in toward the side
of the light to lock it into position. While 'Holding the main body case with either
hand, grasp the flashguard shield with the other hand and pull it up until it stops
or a slight locking sound is detected, then release. This is an indication that the
Blue filter has been released and fully engaged to its proper operating position.
(Figure 4)

5. Performance Testing

a. Light Leakage Test

With the IR filter in its operation position (Figure 3), turn the switch ON and
observe that no light is transmitted through the sides of the case or the flashguard
shield. Turn switch OFF. No light leakage is allowed in the IR mode. If
necessary, replace the flashguard shield assembly and repeat the test. If a new
flashguard shield fails to remedy the problem, the light is to be condemned and
discarded in accordance with local procedures.

b. Flash Rate Test.

(1) Initial. A ten minute MANUAL flash rate test is a one-time requirement for
all new MS-2000(M) lights received from supply stock. This test is required for
initial acceptance of the light and is conducted to insure that the light is capable of
sustained operations. Select the White Light function (Figure 2), turn the switch
to ON and observe that the strobe lamp flashes. Allow the light to flash for nine
(9) minutes, and then manually count the flash rate of the strobe during the final
one minute of the test. This rate should be 50 ± 10 flashes. It is not necessary to
directly observe the light flashes during this evaluation. This inspection should
be performed in a dark room or enclosure. If any light fails to meet the 50 ± 10
flash rate requirements, check the batteries and, if necessary, replace both
batteries and repeat the test. Additionally, the battery contacts in the battery well
should be checked and, if necessary, cleaned with a small brush. Hold vertical
while using brush so that any debris falls out of the light. Repeat the test again.
If battery replacements or cleaning contacts fail to correct the problem, discard
the light in accordance with local procedures.

(2) Periodic. Normally this test is accomplished in conjunction with other life
support survival kit / vest test requirements and/or as required by specific
MAJCOM directives. This test may be accomplished MANUALLY or

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Y1-03-0146 Rev. D