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747-400 MAINTENANCE MANUAL
S 794-026
(17)
Examine the fittings for leakage.
(a)
Repair the fittings if leakage is found.
S 794-027
(18)
Stop motoring the engine.
E.
Put the Airplane Back to Its Usual Condition
S 864-041
(1)
Open the AIR SUPPLY CONT PWR circuit breaker on the Main Power Distribution Panel, P6, for the applicable engine:
(a)
6H32 AIR SUPLY CONT 1 PWR
(b)
6H33 AAIR SUPLY CONT 2 PWR
(c)
6H34 AIR SUPPLY CONT 3 PWR
(d)
6H35 AIR SUPPLY CONT 4 PWR
S 434-029
(2)
Connect the electrical connector (9) to the pressure controller (5).
S 864-030
(3)
Close the AIR SUPPLY CONT circuit breaker on the Main Power
Distribution Panel, P6, for the applicable engine:
(a)
6H32 AIR SUPLY CONT 1 PWR
(b)
6H33 AAIR SUPLY CONT 2 PWR
(c)
6H34 AIR SUPPLY CONT 3 PWR
(d)
6H35 AIR SUPPLY CONT 4 PWR
S 754-031
(4) Put the ENGINE BLEED switch to the OFF position.
NOTE: Listen to the pressure controller when the ENGINE BLEED
____ switch goes to the OFF position. The shutoff solenoid will make a "click" and become warm.
S 444-032
(5) Activate the HPSOV (AMM 36-11-05/201).
S 414-033
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU CLOSE THE THURST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(6)
Close the left thrust reverser (AMM 78-31-00/201).
(7)
Close the left core cowl panel (AMM 71-11-06/201).
S 414-046
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747-400 MAINTENANCE MANUAL
(8) S 414-047Close the left fan cowl panel (AMM 71-11-04/201).
(9) S 444-048Do the activation procedure for the thrust reverser (AMM 78-31-00/201).
S 864-034
(10) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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747-400
MAINTENANCE MANUAL
AIR DRIVEN PUMP (ADP) PNEUMATIC DUCT SCREEN ASSEMBLY - REMOVAL/INSTALLATION
___________________________________________________________________________
1. General
_______
A. This procedure contains two tasks. The first task removes the ADP pneumatic duct screen. The second task installs the ADP pneumatic duct screen.
B. It is necessary to open the applicable trailing edge fairing doors. You must remove the pressure compensator duct to get access for these tasks.
TASK 36-11-24-004-001
2. Remove the ADP Pneumatic Duct (Fig. 401)
_____________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
36-00-00/201, Pneumatic System
(3)
36-11-16/401, Engine Bleed Air Pressure Compensator Duct
(4)
54-62-00/201, Nacelle Strut Access Panels
B.
Access
(1)
Location Zone
454 System 1 - Strut Trailing Edge Fairing
464 System 2 - Strut Trailing Edge Fairing
474 System 3 - Strut Trailing Edge Fairing
484 System 4 - Strut Trailing Edge Fairing
(2)
Access Panel
454A Trailing Edge Fairing Doors - System 1
464A Trailing Edge Fairing Doors - System 2
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