LANDING, RUNWAY TURNOFF, AND TAXI LIGHTS -TRANSFORMERS
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LANDING, RUNWAY TURNOFF, AND TAXI LIGHTS -OPERATION
Operation
You use the left, nose, and right landing light switches (LEFT, NOSE, RIGHT LANDING) to operate the landing gear lights. These switches are on the passenger signs/lighting panel on the P5 overhead. The switches are the toggle-type.
You use the left and right runway turnoff light switches (L, R RUNWAY TURNOFF) to operate the runway turnoff lights. You use the taxi light switch (TAXI) to operate the taxi lights. These switches are on the anti-ice/lighting panel on the P5 overhead panel. The switches are the toggle-type.
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LANDING, RUNWAY TURNOFF, AND TAXI LIGHTS -OPERATION
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LANDING, RUNWAY TURNOFF, AND TAXI LIGHTS -LANDING LIGHTS -FUNCTIONAL DESCRIPTION
General
The LEFT, NOSE, and RIGHT landing lights switches give signals to the overhead panel ARINC systems (OPAS). These signals go to the electronic load management system (ELMS) electronics unit. There is an ELMS electronics unit in each power management panel.
The panel gets gear position data from the proximity sensor electronics unit (PSEU).
Wing Landing Lights
When the LEFT or RIGHT landing light switch is in the ON position, a control relay energizes. This makes the wing landing (WG LDG) light come on.
The lights have two modes, bright and dim. A bright/dim control relay energizes when the landing gear is down and locked. This makes the lights operate in the bright mode. When the relay is not energized the lights operate in the dim mode.
In the bright mode the transformer decreases the voltage to 28 V AC. In the dim mode it decreases the voltage to 24 V AC.
A small amount of power goes to the wing landing lights to prevent thermal shock when the lights comes on and to increase the life of the lights. The small amount of power goes to the lights when the:
*
Airplane is in the air
*
LEFT and RIGHT landing light switches are OFF
*
Nose gear is not down and locked.
Nose Gear Landing Lights
When the NOSE landing light switch is in the ON position, a control relay energizes. This makes the nose landing gear (NLG) lights come on. A transformer decreases the voltage to 28 V AC.
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LANDING, RUNWAY TURNOFF, AND TAXI LIGHTS -LANDING LIGHTS -FUNCTIONAL DESCRIPTION
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LANDING, RUNWAY TURNOFF, AND TAXI LIGHTS -RUNWAY TURNOFF & TAXI LIGHTS -FUNCTIONAL DESCRIPT
General
The LEFT and RIGHT runway turnoff light switches and the TAXI light switch give signals to OPAS. The signals go to the electronic load management system (ELMS) electronics unit. There is an ELMS electronics unit in each power management panel.
The panel gets gear position data from the proximity sensor electronics units (PSEUS).
Runway Turnoff Lights
When the LEFT or RIGHT runway turnoff switch is in the ON position, a switch closes and causes the control relay to energize. This makes the turnoff light come on.
Transformers decrease the voltage to 28 volts.
Taxi Lights
When the TAXI light switch is in the ON position and the nose gear is down and locked, a switch closes. This causes the control relay to energize and makes the taxi lights come on.
Transformers decrease the voltage to 28 volts.
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LANDING, RUNWAY TURNOFF, AND TAXI LIGHTS -RUNWAY TURNOFF & TAXI LIGHTS -FUNCTIONAL DESCRIPT
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777 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
POSITION LIGHTS -INTRODUCTION
Purpose
The position lights aid in collision avoidance.
The position light transformers (not shown) decrease the voltage that goes to the lights.
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