(a)
P6 Main Power Distribution Panel
1) 6H32 AIR SUPPLY CONT 1 PWR
2) 6H33 AIR SUPPLY CONT 2 PWR
3) 6H34 AIR SUPPLY CONT 3 PWR
4) 6H35 AIR SUPPLY CONT 4 PWR
S 434-024
(15)
Connect the electrical connector DM7191 (1) to the high pressure controller (4).
S 864-025
(16)
For the applicable engine: Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a)
P6 Main Power Distribution Panel
1) 6H32 AIR SUPPLY CONT 1 PWR
2) 6H33 AIR SUPPLY CONT 2 PWR
3) 6H34 AIR SUPPLY CONT 3 PWR
4) 6H35 AIR SUPPLY CONT 4 PWR
S 754-026
(17)
Put the ENGINE BLEED switch to the OFF position.
(a)
Listen to the high pressure controller (4) when the ENGINE BLEED switch goes to the OFF position.
NOTE: The shutoff solenoid will make a click.
____
S 864-027
(18)
Put the BLEED AIR switch to the ON position.
E.
Put the Airplane Back to Its Usual Condition
S 414-028
WARNING: OBEY THE INSTRUCTOPMS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU CLOSE THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
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36-11-06
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
(1) Close the left thrust reverser (Ref 78-31-00/201).
(2) S 414-040Close the left core cowl panel (Ref 71-11-06/201).
(3) S 414-041Close the left fan cowl panel (Ref 71-11-04/201).
(4) S 444-042Do the activation procedure for the thrust reverser (Ref 78-31-00/201).
(5) S 864-029Remove the electrical power if it is not necessary (Ref 24-22-00/201).
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36-11-06
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
WING ISOLATION VALVE - MAINTENANCE PRACTICES
____________________________________________
1. General_______
A. This procedure contains two tasks. The first task deactivates the wing isolation valve. The second task activates the wing isolation valve.
B. The two isolation valves are installed in the pneumatic manifold in the aft section of the air conditioning bay.
TASK 36-11-07-042-001
2. Deactivate the Wing Isolation Valve (Fig. 201)___________________________________
A. References
(1)
AMM 06-09-03/201, Body Section 44 Access Doors and Panels
(2)
24-22-00/201, Manual Control
B.
Access
(1)
Location Zone 191 Fairing, Wing To Body, Forward Lower Half, LH 192 Fairing, Wing To Body, Forward Lower Half, RH
(2)
Access Panel
191NL Air Conditioning Access Door
192NR Air Conditioning Access Door
C.
Prepare to Deactivate the Wing Isolation Valve
S 862-002
(1)
Supply electrical power (Ref 24-22-00/201).
S 012-003
(2)
Open the applicable access door that follows to get access to the valve (AMM 06-09-03/201).
(a)
191NL for the left isolation valve
(b)
192NR for the right isolation valve.
D.
Procedure
S 862-004
(1)
Put the wing ISLN switch, on the P5 overhead panel, to the OPEN position.
(a)
It will be approximately 10 seconds for the valve to open.
S 862-005
(2)
Open the applicable circuit breaker and attach a DO-NOT-CLOSE tag:
