S 942-107
(4)
Put on the body harness and attach it to the attach point on the horizontal stabilizer with the attach lanyard.
S 012-108
(5)
Remove the six mounting screws from the lens retainer.
NOTE: Do not remove the four fasteners on the lens retainer.
____
(a) Pull out the lens assembly and put it to the side.
NOTE: Do not remove the lanyard.
____
S 822-056
(6) Do these steps to adjust the logo light beam:
(a)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
1) Aft Center Miscellaneous Circuit Breaker Panel, P84 a) LOGO LIGHTS - LEFT b) LOGO LIGHTS - RIGHT
(b)
On the pilot's overhead panel, P5,
push the LOGO switch to the ON position.
(c)
Turn the two adjustment screws as necessary to point the light beam on the center of the logo.
(d)
Push the LOGO switch to the OFF position.
S 412-057
(7)
Install the lens assembly with the six mounting screws.
S 392-109
(8)
Apply sealant around the outer edge of the lens assembly (AMM 51-31-01/201).
(9)
Disconnect the attach lanyard from the horizontal stabilizer.
S 862-111
(10)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
S 942-110
(a) Overhead Circuit Breaker Panel, P7
1) 7E07, STAB TRIM S/O LEFT
2) 7E20, STAB TRIM S/O RIGHT
S 862-112
(11) On the pilot's control stand panel, P8, set the STAB TRIM 2 switch and the STAB TRIM 3 switch to the ON position.
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S 862-113
(12) Remove electrical power if it is not necessary for other tasks (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
AREA LIGHTS - DESCRIPTION AND OPERATION
_______________________________________
1. General_______
A. Three light assemblies are mounted on the fuselage to illuminate airport ramp areas adjacent to each of the lower cargo doors. Area light assemblies are located on the exterior fuselage as follows:
(1)
Aft of the lower forward cargo door No. 1.
(2)
Forward of lower cargo door No. 2.
(3)
Aft of the bulk cargo door.
B. Each light assembly is provided with a control switch. Switches for area lights of cargo doors 1 and 2 are located in the exterior recessed control box adjacent to each door. The switch for the bulk cargo door area light is installed inside the forward edge of the bulk cargo door frame.
C. Each light assembly consists of a step-down transformer and a sealed beam lamp mounted behind a heat-resistant glass lens. Relamping is accomplished by removing the lens from the exterior side of the fuselage.
D. Area light assembly transformers are installed on the outside surface of the light housing. Access to the transformer is accomplished from the interior of the cargo area.
E. The 115 volt ac ground handling bus supplies power to the light assembly transformer. 28 volts ac is tapped off the transformer to provide power to the seal beam lamp.
F. For more data about this lighting system, refer to these sources:
(1)
SSM 33-37-01 thru 33-37-99
(2)
WDM 33-37-11 thru 33-37-99
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