NOSE LANDING GEAR STRUT D Exterior Lights - Component Location Figure 102 (Sheet 2)
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747-400 FAULT ISOLATION/MAINT MANUAL
(4 LOCATIONS) WING ILLUMINATION LIGHT
E Exterior Light - Component Location Figure 102 (Sheet 3)
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747-400 FAULT ISOLATION/MAINT MANUAL
UPPER RED WHITE
ANTI-COLLISION LIGHT WINGTIP ANTI-COLLISION
TAILCONE
ANTI-COLLISION LIGHT LIGHT ANTI-COLLISION
(BEACON)
LIGHT
Exterior Lights - Component Location
Figure 102 (Sheet 4)
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747-400 FAULT ISOLATION/MAINT MANUAL
WHITE ANTI-COLLISION LIGHT POWER SUPPLY
FRONT SPAR
FWD WINGTIP FAIRING
LENS FWD
NAVIGATION
LIGHT
WINGTIP NAVIGATION AND
WHITE ANTI-COLLISION LIGHTS
H
APU EXHAUST
PORT
TAIL NAVIGATION LIGHT
WHITE TAIL CONE ANTI-COLLISION LIGHT
Exterior Lights - Component Location
Figure 102 (Sheet 5)
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747-400 FAULT ISOLATION/MAINT MANUAL
AFT EQUIPMENT CENTER, P84
Exterior Lights - Component Location
Figure 102 (Sheet 6)
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747-400 MAINTENANCE MANUAL
WING ILLUMINATION LIGHTS - DESCRIPTION AND OPERATION
____________________________________________________
1. General_______
A. Wing illumination lights are flush mounted on each side of the airplane above the intersection of the wing leading edge and the fuselage. Each of the 250 watt sealed beam lamps is housed behind heat resistant glass and focused on the wing leading edge. The lights have sufficient back scatter to illuminate the engine nacelles in addition to the wing leading edges.
B. The 115 volt ac ground service bus supplies power to the wing illumination lights through stepdown transformers. Wing illumination light transformers are located in the floor beam area above the forward cargo compartment ceiling liner. The secondary output of the transformers provides 13 volts to the lamps. The circuit breaker for the lights is on the main power circuit breaker panel P6.
C. A WING toggle switch located on the M7262 RH LTG control module (P5) controls the primary voltage to the transformers.
D. For more data about this lighting system, refer to these sources:
(1)
SSM 33-41-10
(2)
WDM 33-41-11
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