(2)
AMM 36-00-00/201, Pneumatic System
B.
Access
(1)
Location Zone 191 Fairing, Wing To Body, Forward Lower Half, LH 192 Fairing, Wing To Body, Forward Lower Half, RH
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A
747-400
MAINTENANCE MANUAL
(2) Access Panel
191NL Air-Conditioning Access Door
192NR Air-Conditioning Access Door
C. Procedure
S 014-048
(1)
Open the access door 192NR for the right isolation valve or 191NL for the left isolation valve (AMM 06-09-03/201).
S 864-049
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6 Main Power Distribution Panel
1) 6H20 L ISO VLV AIR SUPPLY PWR
2) 6H24 R ISO VLV AIR SUPPLY PWR
S 214-050
(3)
Do a visual check of the applicable wing isolation valve and electrical connections for the correct installation and condition.
S 864-051
(4)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
S 414-052
(5)
Close the access door (AMM 06-09-03/201).
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747-400 MAINTENANCE MANUAL
APU CHECK VALVE - REMOVAL/INSTALLATION
______________________________________
1. General
_______
A. This procedure contains two tasks. The first task removes the APU check valve. The second task installs the APU check valve. The second task also does a leakage test for the APU check valve.
B. The APU check valve is installed in the wheel well for the left main landing gear. It is in the lower inboard forward corner. It is necessary to open the doors for the main landing gear to get access to the valve.
C. You must make sure the ground locks for the main landing gear are installed before you remove the APU check valve.
TASK 36-11-08-004-001
2. Remove the APU Check Valve (Fig. 401)
__________________________
A. References
(1)
AMM 09-11-00/201, Towing and Taxiing
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 32-00-30/201, Landing Gear Door Locks
(4)
AMM 36-00-00/201, Pneumatic System
(5)
IPC 36-11-60 Fig. 1
B.
Access
(1)
Location Zone
135 Wing Landing Gear Wheel Well, LH
C.
Prepare to Remove the APU check valve
S 864-002
(1) Supply the electrical power (AMM 24-22-00/201).
S 494-003
WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(2) Install the ground locks in all landing gear (AMM 09-11-00/201).
S 494-004
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(3)
Do this task "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).
S 494-027
(4)
Do this task "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).
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