S 434-022
(6)
Install the electrical connector on the valve.
S 864-024
(7)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P6 Main Power Distribution Panel 1) 6E35, A/C CONT CARGO - AFT LWR (Aft cargo valve) 2) 6E36, A/C CONT CARGO - FWD LWR (Forward cargo valve)
(b)
P414 Power Distribution Center-Left 1) 414A10, LWR CARGO A/C VLV - FWD (Forward cargo valve) 2) 414A11, LWR CARGO A/C VLV - AFT (Aft cargo valve)
(8)
Apply pneumatic pressure (Ref 32-00-00/201).
(9)
Operate packs 2 and 3 (AMM 21-00-00/201).
S 864-037
(10)
Put the LOWER LOBE CARGO COND AIR FLOW RATE switch on the P461 panel to the LOW BOTH position.
S 724-027
(11)
Make sure the position indicator on the valve shows that the valve is open.
S 864-025
S 864-036
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747-400 MAINTENANCE MANUAL
S 794-028
(12) Examine the duct connections for air leaks.
(a)
Light leakage is permitted.
(b)
If the leakage is strong, make sure the duct joints are aligned and the clamps are tight.
S 864-038
(13)
Put the LOWER LOBE CARGO COND AIR FLOW RATE switch on the P461 panel to the OFF position.
S 724-031
(14)
Make sure the position indicator on the valve shows that the valve closed.
S 094-031
WARNING: REFER TO THE SPECIFIED PROCEDURE WHEN YOU REMOVE THE DOOR LOCKS
_______ FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF THERE IS PRESSURE IN THE SYSTEM. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT.
(15)
Remove the body and the wing gear door locks (Ref 32-00-30/201).
(16)
Stop pack 2 and 3 (AMM 21-00-00/201).
(17)
Release the pressure in the pneumatic system (Ref 36-00-00/201).
(18)
Remove electrical power (Ref 24-22-00/201).
S 864-039
S 864-033
S 864-034
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2.
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747-400 MAINTENANCE MANUAL
ECS FREIGHTER CARD - REMOVAL/INSTALLATION
_________________________________________General
_______
A. The Environmental Control Systems (ECS) Freighter card is installed in the M7603 electrical systems card file in the main equipment center.
B. The ECS Freighter card is an electrostatic discharge sensitive device and must be handled correctly. If the card is not handled correctly it can be damaged.
TASK 21-28-06-004-001
ECS Freighter Card Removal (Fig. 401)
__________________________
A. References
(1)
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices
(2)
IPC 21-58-55, Fig. 1
(3)
SSM 21-28-01
(4)
WDM 21-28-14
B. Access
(1) Location Zone
115 Area Between Nose Gear Well and Fuselage, LH
C. Procedure
S 864-003
(1) Open this circuit breaker on the P6 main power distribution panel and install a DO-NOT-CLOSE identifier:
(a) 6E34, A/C CONT CARGO - PCA
S 024-010
CAUTION: MAKE SURE YOU READ THE PROCEDURE IN AMM 20-41-02/201 BEFORE YOU
_______ TOUCH THE ECS FREIGHTER CARD. THE ECS FREIGHTER CARD IS AN ELECTROSTATIC DISCHARGE SENSITIVE DEVICE. IF YOU DO NOT HANDLE THE CARD CORRECTLY YOU CAN DAMAGE IT.
(2) Remove the ECS Freighter card from the M7603 forward electrical systems card file (AMM 20-41-02/201).
TASK 21-28-06-404-002
ECS Freighter Card Installation (Fig. 401)
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