Northern Airborne Technology LD12-002 User Manual

Installation and Operation Manual

LD12-002

LED Dimmer

SM85

ISSUE 1.00

Northern Airborne Technology Ltd.

1925 Kirschner Road

Kelowna, BC, Canada.

V1Y 4N7

Telephone [phone]

Facsimile [phone]

Issued on the authority of Northern Airborne Technology Ltd.

Copyright 2010

LD12-002 LED Dimmer

SM85 Installation and Operation Manual

Prepared By: Checked By: Approved By:

The status of this installation and operation manual is controlled by issue shown on the title page. The
status of each section is controlled by revision shown in the footer of each page. All revisions affecting
sections of this manual have been incorporated into the latest issue.

ISSUE/REVISION RECORD

Manual Issue

Number

Section

Revision Number

Revision Description Issue Date

1.00 Section 1 Rev: 1.00

Initial release Mar 16, 2010
Section 2 Rev: 1.00
Section 3 Rev: 1.00

Installation and Operation Manual Page ii

ENG-FORM: 820-0115.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

LD12-002 LED Dimmer

SM85 Installation and Operation Manual

Table of Contents

Section Title Page

1. Description

1.1 Introduction 1-1

1.2 Product Description 1-1

1.3 Design Features 1-1

1.3 Features 1-1

1.4 Specifications 1-1

1.4.1 Electrical Specifications 1-1

1.4.2 Physical Specifications 1-2

1.4.3 Environmental Specifications 1-2

2. Installation

2.1 Introduction 2-1

2.2 Unpacking and Inspection 2-1

2.2.1 Warranty 2-1

2.3 Continued Airworthiness 2-1

2.4 Installation Procedures 2-1

2.4.1 Warnings 2-2

2.4.2 Cautions 2-2

2.4.3 Cabling and Wiring 2-2

2.4.4 Installation Variations 2-3

2.4.5 Optional Dimmer Adjustment 2-3

2.4.6 Optional Emergency Bypass Switch 2-3

2.4.7 Post-Installation Checks 2-3

2.5 Adjustments and Connections 2-4

2.6 Accessories Required But Not Supplied 2-4

2.7 Installation Drawings 2-5

3. Operation

3.1 Introduction 3-1

3.2 General Information 3-1

Installation and Operation Manual Page iii

ENG-FORM: 820-0115.DOT

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LD12-002 LED Dimmer

SM85 Installation and Operation Manual

Section 1 Description

1.1 Introduction

Information in this section consists of product description, design features and specifications for the
LD12-002 LED Dimmer. All derivative product information will be contained in the applicable manual
supplement, which may be obtained from Northern Airborne Technology Ltd. as required.

Review all notes, warnings and cautions.

1.2 Purpose of Equipment

The LD12-002 is a remote mounted light dimmer module, designed for complicated annunciator
requirements in Loran / GPS systems. The unit is capable of controlling 12 independent LEDs with full
test function. In its basic mode of operation, the LD12-002 can be used as a bulk LED dimmer, outputting
up to 1 amp of current. The LD12-002 unit can be easily interfaced with all NAT RS-series remote switch
products used in Loran / GPS installations.

1.3 Features

Internal logic is provided to interface to both the floating LED connections of the PB08, and annunciators
triggered by a ground output. An adjustable LED dimmer is provided to drive twelve separate 28 Vdc/50
mA LED lines.

The dimmer may be operated in the preset mode (typically set in the 12-24 V range), or as an adjustable
dimmer via an external control. A single switch can be used to select day, night, and LED test functions.

The day operation mode also provides regulated 24 Vdc for all LEDs, to prevent early LED failure and
internal LED blackening from excessive voltage.

All interconnect and relay contacts are gold plated. Relays are sealed, high vibration rated (50 g shock),
dry nitrogen filled units.

Circuit boards are constructed of G10-FR (flame retardant) material, with solder masks, reflowed tin
plating, and environmental post-coating.

1.4 Specifications

1.4.1 Electrical Specifications

Input Power +24.8 Vdc to +30 Vdc, +27.5 Vdc nominal (reverse and

over voltage protection)
Input Current 50 mA idle (2 A max.)
Inputs
Test Keyline Active low input. Grounding this pin will cause all LEDs

to illuminate at full brightness.

Section 1 Rev: 1.00 Issue 1 Page 1-1

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LD12-002 LED Dimmer

SM85 Installation and Operation Manual

Dimmer Active low input. Grounding this pin will cause the

internal preset dimmer voltage to be supplied to all

Dimmer Ground Provides a convenient ground return for the dimmer

LED Power In Direct connection to internal LED bus.
LED Keys Active low keyline. Grounding this pin will cause the

Outputs
LED Outputs 0 mA to 50 mA of current to 2 floating LED circuits and 10

Dimmer Out Direct connection to dimmer circuit output.
Provides up to 1 A of current.

LEDs.

controls.

selected LED to illuminate. Current drawn will depend on

type of LED used in circuit. Pin should be left open when

unused.

ground keyed circuits for system annunciators.

1.4.2 Physical Specifications

Height 1.78 inches (45.1 mm) max
Length 5.29 inches (134.4 mm) max
Width 3.99 inches (101.3 mm) max including flanges
Weight 0.84 lbs (380 g) max
Mounting Bulkhead attachment (4 x 10-32 screws)

1.4.3 Environmental Specifications

Temperature -15° C to +70° C (ambient)

-55° C to +85° C (survival)
Altitude 50,000 feet max
Humidity 95% Non-condensing Cat. A

Vibration Conforms to DO-160C, Cat. B, M, N

Section 1 ends

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LD12-002 LED Dimmer

SM85 Installation and Operation Manual

Section 2 Installation

2.1 Introduction

Information in this section consists of unpacking and inspection procedures, installation procedures,
post-installation checks and installation drawings for the LD12-002 LED Dimmer.

Review all notes, warnings and cautions.

2.2 Unpacking and Inspection

Unpack the equipment carefully and locate the warranty card. Inspect the unit visually for damage due to
shipping and report all such claims immediately to the carrier involved. Check that all items listed below
are present before proceeding and report any shortage immediately to your supplier:

- Warranty Card

- Certificate of Conformity or Release Certification

2.2.1 Warranty

All Northern Airborne Technology Ltd. products are warranted for 2 years from date of installation by an
authorized Northern Airborne Technology Ltd. dealer, to be free of defects in workmanship or
performance. This warranty covers all materials and labour, but is exclusive of any transport to deliver the
defective unit to and from Northern Airborne Technology Ltd. or its designated warranty repair center, or
any labour to remove or re-install the defective unit in the aircraft. Contact Northern Airborne Technology
Ltd. for any questions regarding this warranty, its applicability to your units and/or for return authorization.
Northern Airborne Technology Ltd. is the final arbitrator concerning warranty administration. Units which
have been physically damaged, burned, immersed in water or otherwise abused beyond the scope of
normal use will not be considered for warranty. WARRANTY IS VOID UNLESS THE PRODUCT IS
INSTALLED BY AN AUTHORIZED NORTHERN AIRBORNE TECHNOLOGY LTD. DEALER. Product
for which a warranty card is not returned shall be warranted from date of manufacture.

2.3 Continued Airworthiness

Maintenance of the LD12-002 LED Dimmer is ‘on condition’ only. Periodic maintenance of this product is
not required.

2.4 Installation Procedures

Installation Notice
This product must be installed in accordance with the installation instructions provided in the latest issue

of this Installation and Operation Manual. Check the Publication Index at www.northernairborne.com for
the issue status of the manual. The latest issue of the manual may be downloaded from the same
website. All risk associated with installation of this product contrary to these instructions shall be the
responsibility of the installing agency.

Section 2 Rev: 1.00 Issue 1 Page 2-1

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

2.4.1 Warnings

N/A

2.4.2 Cautions

Do not bundle any lines from this unit with transmitter coax lines. Do not
bundle any logic or DC power lines from this unit with 400 Hz synchro wiring
or AC power lines. Do not position this unit next to any device with a strong
alternating magnetic field such as an inverter, motor or blower.

Do not install the LD12-002 without making a suitable amendment to the flight
manual indicating how the NAV annunciation and dimming/ test functions
have been implemented in the aircraft.

LD12-002 LED Dimmer

SM85 Installation and Operation Manual

CAUTION:

CAUTION:

CAUTION:

Ensure that no press-to test lamp holders with incandescent lamps have been
used in the aircraft. These can cause the line(s) to be shorted to ground,
which may damage the internal circuitry of the LD12-002.

2.4.3 Cabling and Wiring

Note: In order to minimize wiring, the unit should be located close to the annunciators it will be dimmi ng.

It should not be mounted near hot air paths, as substantial heat dissipation is required.

All wire shall be selected in accordance with the original aircraft manufacturer's Maintenance Instructions
or AC43.13-1B Change 1, Paragraphs 11-76 through 11-78. Unshielded wire types shall qualify to
MIL-W-22759 as specified in AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11.
For shielded wire applications, use Tefzel MIL-C-27500 shielded wire with solde r sleeve s (fo r shield
terminations) to make the most compact and easily terminated interconnect. Follow the interconnect
drawing in Section 2.7 as required.

Allow 3" from the end of the shielded wiring to the shield termination to allow the connector hood to be
easily installed. Refer to the interconnect drawing in Section 2.7 for shield termination details. Note that
the hood is a 'clamshell' hood, and is installed after the wiring is complete.

Maintain wire segregation and route wiring in accordance with the original aircraft manufacturers
Maintenance Instructions.

Unless otherwise noted, all wiring shall be a minimum of 22 AWG, except power and ground lines, which
shall be a minimum of 20 AWG. Reference the Interconnect drawing for additional specifications. Check
that the ground connection is clean and well secured, and that it shares no path with any electrically noisy
aircraft accessories such as blowers, turn and bank instruments or similar loads. Power to this unit must
be supplied from a separate circuit breaker or fuse (fast blow), and not attached to any other circuit
breaker without additional protection. Verify that the selected circuit breaker size and wire gauge are
adequate for the installation using the techniques specified in AC43.13-1B Change 1, Paragraphs 11-47
through 11-51 and 11-66 through 11-69.

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LD12-002 LED Dimmer

SM85 Installation and Operation Manual

2.4.4 Lighting Mode Switch

The normal installation of the LD12-002 assumes the installation of a remote momentary SPDT centre-off
toggle switch, used to select from the following modes:

MODE SWITCH POSITION FUNCTION
DIM
NORM
TEST

The centre-off position of the switch should correspond to the NORM position.
The mode switch should be spring loaded in the TEST position so that it will return to the NORM position

when released. Alternatively, the DIM function can be selected by a separate switch, or tied into another
switch function, and the LED test can be activated by a momentary pushbutton switch.

The DIM position can also have a level control connected in series with the switch, to permit local
adjustment of the night flying LED level. The switch may also be integral with the level control to
conserve panel space.

Selects night flying LED levels. See section 2.5
Selects day flying LED levels (full brightness).
Tests functionality of all LEDs. All LEDs ON (full brightness).

2.4.5 Optional Dimmer Adjustment

Inserting a 10 kΩ, 1/2 W linear taper potentiometer between the dimmer input and ground wil l allow
external adjustment of the dimming voltage. If using an external adjustment, ensure that the internal
trimpot is set for minimum voltage output (rotated fully ccw).

2.4.6 Optional Emergency Bypass Switch

An optional external single-pole single-throw toggle switch can be installed to ro ute an external voltage to
the LEDs if the dimmer should fail.

2.4.7 Post-Installation Checks

Before the unit is mounted, make all functional tests and trimpot adjustments. Be sure the harness has
enough clearance to permit the unit to be pulled out for re-adjustment, if needed later.

2.4.7.1 Voltage/Resistance Checks
Do not attach the LD12-002 until the following conditions are met.

Check the following:

a) Check P1 pin <1> for +28 Vdc relative to ground.
b) Check P1 pin <34> for continuity to ground (less than 0.5Ω).
c) Check J1 pin<2> for 28 Vdc LED power from lighting bus.
d) Ensure that no short circuits exist on any line (Lamp HI to lamp LO or to ground).

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LD12-002 LED Dimmer

SM85 Installation and Operation Manual

2.4.7.2 Power On Checks

Power up the aircraft’s systems and confirm normal operation of all functions of the LD12-0 02.
a) Select the TEST position on the mode switch and check that all LEDs are functioning.
b) Select the NORM position on the mode switch; LEDs that are activated should be fully

illuminated.

c) Select the DIM position on the mode switch and adjust the dimmer pot; the active LEDs should

track the dimmer pot.

d) Make sure unit is securely fastened and that the connector locks are correctly mated before any

flight is attempted.

Upon satisfactory completion of all performance checks, make all required log book entries, electrical
load, weight and balance amendments and other documentation as required by your local regulatory
agency before releasing the aircraft for service.

2.5 Adjustments and Connections

Access for internal

dimmer adjustment

The dimming voltage (and therefore the dimming level) of the LD12-002 may be adjusted by rotating an
internal trimpot, which can be accessed through an opening in the cover. To select minimum voltage
output, the trimpot is rotated fully counterclockwise (ccw), and for maximum voltage output the trimpot is
rotated fully clockwise (cw).

See section 2.4.4 for lighting mode switch information.

2.6 Accessories Required But Not Supplied

Installation kit p/n D50SV-IKC (crimp) is required to complete the installation. The kit consists of the
following:

Quantity Description NAT Part No.

1 D-min 50 Socket Housing 20-21-050
50 MS Crimp Socket 20-26-901
1 50 Pin JVL Hood/Locklever 20-29-500

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LD12-002 LED Dimmer

SM85 Installation and Operation Manual

2.7 Installation Drawings

Note: The LD12-002 LED Dimmer uses some installation drawings from the LD12-001 Lamp Dimmer.
DOCUMENT REV. DESCRIPTION TYPE

LD12\001\403-0 1.00 Lamp Dimmer - External Dimming Interconnect
LD12\001\403-1 1.00 Lamp Dimmer with RS08 - External Dimming Interconnect
LD12\001\405-0 1.00 Lamp Dimmer Connector Map
LD12\002\922-0 1.00 LED Dimmer Mechanical Installation

Section 2 ends following the above documents

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Confidential and Proprietary to NAT

Confidential and Proprietary to NAT

Confidential and Proprietary to NAT

LD12-002 LED Dimmer

SM85 Installation and Operation Manual

Section 3 Operation

3.1 Introduction

Information in this section consists of functional and operational procedures for the LD12-002 Lamp
Dimmer.

3.2 General Information

The LD12-002 Lamp Dimmer has no operator accessible controls. During install ation, it may be
determined that internal level adjustments are required. Qualified personnel only shall complet e internal
level adjustments.

Section 3 ends

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