S 434-025
(2)
Connect the forward door section (3) to the forward hinge on the structure and loosely install the seven screws (4).
(3)
Tighten all the screws (2 and 4).
S 434-026
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747-400 MAINTENANCE MANUAL
H. Do a Test of the Inlet Door
S 864-027
(1)
Remove the DO-NOT-OPERATE tag from the PACKS switch on the P5 overhead panel.
S 864-010
(2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P6 Main Power Distribution Panel
1) 6F35, PACK TEMP CONT A
2) 6F36, PACK TEMP CONT B
(b)
P415 Power Distribution Center - Right
1) 415C38, PACK TEMP CONT B
2) 415K27, PACK TEMP CONT A
S 864-029
(3)
Supply electrical power (Ref 24-22-00/201)
S 744-011
(4)
Do the ground test for the pack temperature controllers
(Ref 21-51-00/501).
S 714-028
(5)
Make sure the inlet door and the linkages move smoothly and freely, and without the sound of clicks during the operation.
S 214-030
(6)
Make sure there is an approximate 0.25 inch (6.3 mm) gap between the door and the inlet lip when the door is in the closed position.
I. Put the Airplane Back To Its Usual Condition
S 864-009
(1) Remove the electrical power if it is not necessary
(Ref 24-22-00/201).
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747-400
MAINTENANCE MANUAL
RAM AIR INLET DOOR - INSPECTION/CHECK
_____________________________________
1. General
_______
A. This procedure has two tasks. The first task gives instructions for a detailed inspection of the hinges on the ram air inlet door. The first task requires the disassembly of the hinges to do the inspection. The second task gives instructions for a visual inspection of the hinges on the ram air inlet door. The second task does not require the disassembly of the hinges to do the inspection.
B. The first inspection procedure for the inlet door has these steps:
-
Remove the inlet door
-
Remove the hinges from the inlet door
-Inspect the hinges
-
Install the hinges from the inlet door
-
Install the inlet door
TASK 21-62-02-006-001
2. Ram Air Inlet Door - Detailed Inspection (Fig. 601)
________________________________________
A. Consumable Material
(1)
B00600 - Solvent - Isopropyl Alcohol, Cleaning
(2)
B00401 - Solvent - Ethyl Alcohol, Cleaning
(3)
A00923 - Adhesive - BAC5010 Type 77
B. References
(1)
21-62-02/401, Ram Air Inlet Door
(2)
AIPC 21-62-02 Fig. 1
C. Access
(1) Location Zone 123 Wing to Body Fairing, Forward Lower Half, LH 124 Wing to Body Fairing, Forward Lower Half, RH
D. Prepare to Inspect the Inlet Door
S 026-024
(1)
Remove the forward and aft sections of the ram air inlet door (Ref 21-62-02/401).
S 026-023
(2)
Remove the aft hinge from the aft section of the inlet door.
(a)
Remove the nine lockbolts that hold the aft hinge to the inlet door.
(b)
Remove the aft hinge from the inlet door.
S 026-022
(3) Remove the forward hinge from the forward section of the inlet door.
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