777 AMM 飞机维护手册 灯 Lights(36)

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Physical Description
The position lights are red, green, or white.
Location
There are position lights on the forward and aft tips of each wing. There is a position light on the airplane tailcone.
The transformers are in the tip of each wing and in the airplane tailcone.
Training Information Point
CAUTION:  DO NOT TOUCH THE LAMP WITH YOUR HANDS. FINGERPRINTS DECREASE LIGHT OUTPUT AND CAN CAUSE FAILURE OF THE LAMPS BEFORE THE USUAL TIME.
WARNING: REMOVE POWER AND ALLOW LAMPS TO COOL BEFORE YOU REPLACE THEM. IF YOU TOUCH THE LAMPS WHEN THEY ARE HOT, THEY CAN BREAK AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
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777 AIRCRAFT MAINTENANCE MANUAL

POSITION LIGHTS -INTRODUCTION

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POSITION LIGHTS -WING POSITION LIGHTS

General
The wing position lights show the position, attitude, and direction of flight of the airplane. There are forward position lights and rear position lights.
Location
The forward position lights are on the wing tips, forward of the wing anti-collision light. There are two lamps in each light assembly.
The rear position lights are on the rear of the wing at the tip, aft of the wing anti-collision light. There are two lamps in each light assembly.
Physical Description
The left forward position light has a red lens. The right light has a green lens. The aft position lights have a clear lens, thus the light is white.
The forward and rear position lamps are two-prong-flange-type lamps.
Each forward position light assembly has these parts:
*
Hinge bracket

*
Reflector (2)

*
Lamp (2)

*
Lanyard (not shown)

* Electrical connector (not shown).
Each rear position light has these parts:
*
Lens

*
Lamp (2)

*
Reflector (2)

*
Lanyard

*
Electrical connector.

Training Information Point
To get acces to the forward position lamps, loosen the captive screws to release the panel on the bottom side of the wing at the tip. Loosen two captive screws; rotate, and unhook the light assembly to get it out of the wing. The light assembly hangs by a lanyard. This gives you access to the lamps.
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777 AIRCRAFT MAINTENANCE MANUAL

POSITION LIGHTS -WING POSITION LIGHTS

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POSITION LIGHTS -WING POSITION LIGHT TRANSFORMERS

Purpose
The position light transformers decrease the amount of voltage that goes to the position lights.
Location
There is one transformer in each wing tip, inboard from the position lights. They are near the wing anti-collision light power supplies.
Physical Description
Each transformer has an electrical connector and four fasteners.
Training Information Point
You loosen captive screws to release the panel on the bottom of the wing at the tip to get access to the transformer.
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POSITION LIGHTS -WING POSITION LIGHT TRANSFORMERS

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POSITION LIGHTS -TAILCONE POSITION LIGHT

Purpose
The tailcone position light lets people outside the airplane see the location of the aft end of the airplane.
Location
The light is on the lower corner of the airplane tailcone.
Physical Description
The tailcone position light has a clear lens, thus the light is white.
There are two lamps in the position light. The lamps are two-prong-flange-type lamps. There is a reflector for each lamp.
The position light has an electrical connector and lanyard.
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POSITION LIGHTS -TAILCONE POSITION LIGHT

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POSITION LIGHTS -TAILCONE POSITION LIGHT TRANSFORMER

Purpose
The position light transformer decreases the amount of voltage that goes to the position lights.
Location
The transformer is in the tailcone area in the aft end of the APU compartment. It is on the right side.
Physical Description
The transformer has an electrical connector and four fasteners.
　
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