(c)
Install the retract line flex hose to the strut hydraulic connection.
(d)
Do the activation procedure for the thrust reverser
(AMM 78-31-00/201).
(e)
Remove the DO-NOT-OPERATE tags from the forward thrust lever and the reverse thrust lever.
(f)
Do the operational test for the thrust reverser (AMM 78-31-00/501). 1) Operate the thrust reverser through three full deploy and
stow cycles.
(g)
Close the fan cowl panels (AMM 71-11-04/201).
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78-31-17
ALL ú ú N01 Page 210 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
THRUST REVERSER HYDRAULIC ACTUATORS - REMOVAL/INSTALLATION
__________________________________________________________
1. General
_______
A. The hydraulic actuating system on the thrust reverser has two types of hydraulic actuators: locking and non-locking. Each thrust reverser has six hydraulic actuators. There are two locking type while the other four are non-locking. The locking hydraulic actuators have more hardware and linkages on the head end which make them different from the non-locking hydraulic actuators. The locking hydraulic actuators are adjacent to the horizontal centerline of each engine. The removal and installation procedures are different in some steps.
B. The hydraulic actuators are attached at one end on the perimeter of the fan cowl on the inner side of the aft end of the fan cowl. You can get access to the hydraulic actuators through the fan cowl panels.
C. The rod ends of the hydraulic actuators are attached in the thrust reverser behind the access panels for the hydraulic actuators. You can get access to the rod ends through the access panels.
TASK 78-31-17-004-001-N00
2. Remove the Thrust Reverser Locking Hydraulic Actuator
_____________________________________________________
A. References
(1)
AMM 27-62-00/201, Speed Brake Control System
(2)
AMM 27-81-00/201, Leading Edge Flap System
(3)
AMM 71-11-04/201, Fan Cowl Panels
(4)
AMM 78-00-00/601, Exhaust
(5)
AMM 78-00-00/801, Exhaust
(6)
AMM 78-31-00/201, Thrust Reverser System
(7)
AMM 78-36-01/401, Thrust Reverser Proximity Sensors
B.
Access
(1)
Location Zone 415 and 416 Engine 1 - Thrust Reverser Halves 425 and 426 Engine 2 - Thrust Reverser Halves 435 and 436 Engine 3 - Thrust Reverser Halves 445 and 446 Engine 4 - Thrust Reverser Halves
(2)
Access Panels
413 and 414 Fan Cowl Panels - Engine 1
423 and 424 Fan Cowl Panels - Engine 2
433 and 434 Fan Cowl Panels - Engine 3
443 and 444 Fan Cowl Panels - Engine 4
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ALL ú ú N01 Page 401 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
C. Prepare to Remove the Locking Hydraulic Actuator
S 044-002-N00
WARNING: DO THE DEACTIVATION PROCEDURE FOR THE SPEED BRAKE CONTROL
_______ SYSTEM. IF YOU DO NOT DO THIS, THE SPOILERS CAN MOVE QUICKLY WHEN YOU MOVE THE THRUST LEVERS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1)
Do the deactivation procedure for the Speed Brake Control System (AMM 27-62-00/201).
S 864-003-N00
(2)
Make sure the forward thrust levers are in the idle position and the reverse thrust levers are fully forward.
(a) Install the DO-NOT-OPERATE tags on the forward and reverse thrust levers.
S 044-083-N00
WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE
_______ THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(3) Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).
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