S 862-072
(12) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) Aft Center Miscellaneous Circuit Breaker Panel, P84 1) LOGO LIGHTS - LEFT 2) LOGO LIGHTS - RIGHT
S 712-073
(13) On the pilot's overhead panel, P5, push the LOGO switch to the ON position.
(a)
Make sure that the logo light comes on.
(b)
Push the LOGO switch to the OFF position.
S 392-075
(14)
Apply sealant around the outer edge of the lens assembly (AMM 51-31-01/201).
S 942-076
(15)
Remove the attach lanyard from the horizontal stabilizer.
S 862-077
(16)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) Overhead Circuit Breaker Panel, P7 1) 7E07, STAB TRIM S/O LEFT 2) 7E20, STAB TRIM S/O RIGHT
S 862-078
(17) 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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747-400 MAINTENANCE MANUAL
S 862-079
(18) Remove electrical power if it is not necessary for other tasks (AMM 24-22-00/201).
TASK 33-45-00-002-021
4. Logo Light - Transformer Replacement (Fig. 201)____________________________________
A. Equipment
(1)
24MIT65B00002 - Attach Lanyard - Saftety Harness Wing/Horizontal Stabilizer
(2)
Full Body Harness
D.B. Industries
3965 Pepin Avenue
Redwing, MN 55066-1837
Phone: (612) 388-8282
B. References
(1)
AMM 20-11-29/201, Seals on Open Electrical Terminals in Fuel Vapor Areas
(2)
AMM 24-22-00/201, Manual Control
C. Access
(1) Location Zone 222 Control Cabin, Right 334 Horizontal Stabilizer Rear Spar To Trailing Edge, Left 344 Horizontal Stabilizer Rear Spar To Trailing Edge, Right
D. Procedure
S 862-095
(1)
Supply electrical power (AMM 24-22-00/201).
S 862-096
(2)
On the pilot's control stand panel, P8, set the STAB TRIM 2 switch and the STAB TRIM 3 switch to the CUTOUT position.
S 862-097
(3)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) Overhead Circuit Breaker Panel, P7
1) 7E07, STAB TRIM S/O LEFT
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747-400 MAINTENANCE MANUAL
2) 7E20, STAB TRIM S/O RIGHT
(b) Aft Center Miscellaneous Circuit Breaker Panel, P84
1) LOGO LIGHTS - LEFT
2) LOGO LIGHTS - RIGHT
S 942-098
(4)
Put on the body harness and attach it to the attach point on the horizontal stabilizer with the attach lanyard.
S 012-099
(5)
Open the access panel on the lower surface of the horizontal stabilizer to get access to the transformer.
S 962-053
(6)
Do these steps to replace a transformer:
(a) Disconnect the electrical wires connected to the transfomer.
NOTE: Make a note of the routing of the electrical wires
____ to use when you install the new transformer.
(b)
Remove the fasteners that hold the transformer to the mounting bracket and remove the transformer.
(c)
Hold the replacement transformer to the mounting bracket while you install the fasteners.
(d)
Connect the electrical wires to the transformer.
WARNING: MAKE SURE YOU SEAL EACH BARE ELECTRICAL CONNECTION NEAR
_______ THE LIGHT TO PREVENT AN EXPLOSION OF THE FUEL FUMES. AN EXPLOSION CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(e) Seal each electrical connection (AMM 20-11-29/201).
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