*
Landing (4)
*
Anti-collision (beacon) (2)
*
Position (5)
*
Logo (4)
*
Anti-collision (strobe) (3)
*
Wing illumination (2)
*
Taxi (2).
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777 AIRCRAFT MAINTENANCE MANUAL
EXTERIOR LIGHTS -INTRODUCTION
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
WING ILLUMINATION LIGHTS -INTRODUCTION
Purpose
The wing illumination lights give light on the leading edge of the wings and the front of the nacelles. This lets the crew to see if there is ice on the leading edge.
The transformers decrease the amount of voltage that goes to the lights.
Location
The lights are on the right and left sides of the airplane, forward of where the wing connects to the fuselage.
The transformers are behind the sidewall panels in the forward cargo compartment. There is one transformer on each side.
Physical Description
The light has these components:
*
Lens
*
Lens retainer
*
Lamp
*
Reflector.
There are six captive screws that hold the lens retainer. There are two captive screws that hold the reflector.
Training Information Point
You replace the wing illumination light from outside the
airplane.
You remove panels on the sidewalls of the forward cargo
compartment to get access to the transformers.
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WING ILLUMINATION LIGHTS -INTRODUCTION
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WING ILLUMINATION LIGHTS -OPERATION
Operation
You use the wing light switch (WING) to operate the wing illumination lights. It is on the anti-ice/lighting panel on the P5 overhead panel. It is an alternate action switch.
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777 AIRCRAFT MAINTENANCE MANUAL
WING ILLUMINATION LIGHTS -OPERATION
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WING ILLUMINATION LIGHTS -FUNCTIONAL DESCRIPTION
Functional Description
The WING switch sends a signal to the overhead panel ARINC systems (OPAS).
The signal goes to ELMS electronics unit (EEU) in the P310 standby power management panel. This closes a switch.
When the wing illumination light control relay energizes power goes to the transformers. The transformers decrease the voltage to 28v dc and makes the right and left wing illumination lights come on.
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WING ILLUMINATION LIGHTS -FUNCTIONAL DESCRIPTION
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LANDING, RUNWAY TURNOFF, AND TAXI LIGHTS -INTRODUCTION
Purpose
The nose gear landing lights and the wing landing lights give light to the runway for takeoff and landing.
The runway turnoff lights give light to the side of the airplane so the crew can see the runway and taxiway turnoffs.
The taxi lights give light in front of the airplane for taxiing.
Transformers (not shown) decrease the voltage that goes to the lights.
Location
The nose gear landing lights and the taxi lights are on the front of the nose gear.
The wing landing lights and runway turnoff lights are on the left and right side of the fuselage. They are on the wing-to-body fairing.
There are transformers on the nose landing gear and in the forward cargo compartment.
Interface
The proximity sensor electronic (PSEU) unit gives information to control the level of light that comes from the landing lights.
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