36-11-01
ALL ú ú 01 Page 606 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
B. References
(1)
AMM 20-11-28/401, Lockwire
(2)
AMM 24-22-00/201, Electrical Power
(3)
AMM 27-81-00/201, Leading Edge Flap System
(4)
AMM 36-00-00/201, Pneumatic Power
(5)
AMM 36-11-01/401, Pneumatic Ducts
(6)
AMM 71-00-00/201, Power Plant
(7)
AMM 78-31-00/201, Thrust Reversers
C.
Access
(1)
Location Zones
412 Engine 1 - High Pressure Compressor Case
422 Engine 2 - High Pressure Compressor Case
432 Engine 3 - High Pressure Compressor Case
442 Engine 4 - High Pressure Compressor Case
(2)
Access Panels
415 Left Thrust Reverser Half - Engine 1
425 Left Thrust Reverser Half - Engine 2
435 Left Thrust Reverser Half - Engine 3
445 Left Thrust Reverser Half - Engine 4
D.
Prepare for the Leak Test
S 866-030
(1) Remove pneumatic power (AMM 36-00-00/201).
S 046-052
WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER FOR GROUND MAINTENANCE.
_______ OPERATION OF THE THRUST REVERSER DURING MAINTENANCE CAN CAUSE INJURY AND DAMAGE.
(2)
Do the deactivation procedure for the thrust reversers for ground maintenance (AMM 78-31-00/201).
(3)
Open the applicable left thrust reverser half (AMM 78-31-00/201).
S 016-056
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
36-11-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 046-042
WARNING: MAKE SURE THAT PERSONNEL AND EQUIPMENT ARE CLEAR OF TE AND LE
_______ FLAPS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER OFF, TRAILING EDGE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN THE FLAP CONTROL LEVER IS MOVED.
CAUTION: MAKE SURE INBOARD FAN COWL PANELS AND INBOARD REVERSER HALVES
_______ FOR NO. 1 AND 4 ENGINES ARE LOWERED BEFORE LEADING EDGE FLAP OPERATION. FAILURE TO DO SO CAN CAUSE DAMAGE TO ENGINE COWLING OR THRUST REVERSER HALVES.
(4) Extend the leading edge flaps (AMM 27-81-00/201).
E. Flexible Ball Joint Leak Test
S 216-059
(1)
Do these steps to do a leakage check of the flexible ball joints:
(a)
Install a 1x2-foot sheet of aluminum foil over each flexible ball joint. 1) Wrap the aluminum foil around the flexible ball joint and
coupling and fold the edges of the foil to make a seal.
2) Make sure the aluminum foil is installed completely around the flexible ball joint and that the foil extends more than one-inch beyond each end of the ball joint.
3) Wrap a wire around the ends of the aluminum foil to install the foil onto the HP duct assembly. 4) Make sure there are no punctures or tears in the aluminum foil.
(b)
Close the left thrust reverser half (AMM 78-31-00/201).
(c)
Start the applicable engine (AMM 71-00-00/201).
(d)
Run the applicable engine at maximum continuous power for 60 to 120 seconds (AMM 71-00-00/201).
(e)
Shutdown the applicable engine (AMM 71-00-00/201).
(f)
Wait for the engine to cool down sufficiently before you get access to the HP duct assembly.
(g)
Open the applicable left thrust reverser half (AMM 78-31-00/201).
(h)
Do an inspection of the aluminum foil installed around the flexible ball joints. 1) If the aluminum foil shows signs of leakage (large
punctures, tears, or foil is missing), replace the entire HP duct assembly (AMM 36-11-01/401).
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