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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
2) 415K27, PACK TEMP CONT A
(3) S 864-035Remove the DO-NOT-OPERATE tag from the PACKS switch on the P5 overhead panel.
(4) S 744-034Do the ground test for the pack temperature controllers (AMM 21-51-00/501).
(5) S 864-008Operate the applicable pack (1,2 or 3) (AMM 21-00-00/201).
S 794-009
WARNING:_______DO NOT TOUCH THE DUCTS WHEN THE DUCTS ARE HOT. THE DUCTS CAN BURN YOU VERY BADLY.
(6) Examine the duct connections at the turbine bypass valve for air leakage.
NOTE: Small quantities of air leakage is permitted while large
____ quantities (jet blasts) of air leakage is not permitted.
G. Put the Airplane Back to Its Usual Condition
S 864-010
(1)
Shut down the applicable pack (1,2 or 3) (AMM 21-00-00/201).
S 864-036
(2)
Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
S 414-039
(3)
Close the access door for the applicable pack (AMM 06-09-03/201):
(a) 191A-L for the pack 1
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A 747-400 MAINTENANCE MANUAL
(b) (c) 191H-L for the pack 2192A-R for the pack 3
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A
747-400 MAINTENANCE MANUAL
RAM AIR INLET DOOR - REMOVAL/INSTALLATION
_________________________________________
1. General_______
A. This procedure has two tasks. The first task is the removal of the door for the ram air inlet. The second task is the installation of the inlet door.
B. The removal of the inlet door has these steps:
-
Remove the power from the pack control system
-
Remove the forward section of the inlet door
-
Remove the aft section of the inlet door.
C. The installation of the inlet door has these steps:
-
Install the aft section of the inlet door
-
Install the forward section of the inlet door
-Supply power to the pack control system
-Do a test of the inlet door.
TASK 21-62-02-004-001
2. Ram Air Inlet Door Removal (Fig. 401)__________________________
A. References
(1) AIPC 21-62-02 Fig. 1
B. Access
(1) Location Zone 123 Wing to Body Fairing, Forward Lower Half, LH 124 Wing to Body Fairing, Forward Lower Half, RH
C. Prepare to Remove the Inlet Door
S 864-013
(1)
Put the PACKS (1,2 or 3) switch to OFF, on the P5 overhead panel for the applicable pack (1,2 or3).
(2)
Put a DO-NOT-OPERATE tag on the PACKS switch.
S 864-015
(3)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(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 864-014
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
SEE A
SEE B
RAM AIR INLET
(TYPICAL)
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