(2)
At high temperatures, the fire-resistant hydraulic fluid can react with the titanium and cause it to deteriorate. The ducts that deteriorate must be replaced.
B. References
(1)
AMM 05-51-12/201, Fire-Resistant Hydraulic Fluid Reaction with Titanium
(2)
AMM 06-09-03/201, Body Section 44 Access Doors and Panels
(3)
AMM 06-09-09/201, Nacelle and Engine-to-Wing Fairing Access Doors and Panels
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747-400
MAINTENANCE MANUAL
(4)
AMM 27-81-00/201, Leading Edge Flap System
(5)
AMM 36-11-01/401, Pneumatic Manifold
(6)
AMM 78-31-00/201, Thrust Reverser System
C.
Access
(1)
Location Zone
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 Panel
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.
Procedure
S 046-002
WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER FOR GROUND MAINTENANCE.
_______ OPERATION OF THE THRUST REVERSER DURING MAINTENANCE CAN CAUSE INJURY AND DAMAGE.
(1)
Open the applicable left thrust reverser half (AMM 78-31-00/201).
S 016-007
(2)
Open the applicable airplane access panels (AMM 06-09-03/201 and 06-09-09/201).
S 866-018
WARNING: CHECK THAT PERSONNEL AND EQUIPMENT ARE CLEAR OF TE AND LE FLAPS
_______ BEFORE MOVING 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 PRIOR TO LEADING EDGE FLAP OPERATION. FAILURE TO DO SO MAY RESULT IN DAMAGE TO ENGINE COWLING OR THRUST REVERSER HALVES.
(3) Extend the leading edge flaps (AMM 27-81-00/201).
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747-400 MAINTENANCE MANUAL
S 116-009
(4)
Clean the titanium pneumatic and thermal anti-ice supply ducts (AMM 05-51-12/201).
S 026-010
(5)
Remove and replace the ducts that have deterioration (AMM 36-11-01/401).
S 446-014
(6)
Close the left thrust reverser half (AMM 78-31-00/201).
S 416-016
(7)
Close the applicable airplane access panels (AMM 06-09-03/201 and 06-09-09/201).
S 866-019
WARNING: CHECK THAT PERSONNEL AND EQUIPMENT ARE CLEAR OF TE AND LE FLAPS
_______ BEFORE MOVING 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 PRIOR TO LEADING EDGE FLAP OPERATION. FAILURE TO DO SO MAY RESULT IN DAMAGE TO ENGINE COWLING OR THRUST REVERSER HALVES.
(8) Retract the leading edge flaps (AMM 27-81-00/201).
TASK 36-11-01-206-029
4. Leakage Check of the Flexible Ball Joints of the Pneumatic Duct
_______________________________________________________________
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