78-31-15
ALL ú ú N01 Page 606 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
THRUST REVERSER CASCADE VANE SEGMENTS - REMOVAL/INSTALLATION
____________________________________________________________
1. General
_______
A. The cascade vane segments are aligned on the perimeter of the thrust reverser to point the fan flow forward and away from the airplane body. There is a limit to the interchangeable cascade vane segments. The configuration of the cascade vane segments is different between the engines installed on the left or right side of the airplane.
B. Some cascade vane segments are installed behind the hydraulic actuators. If you cannot get access to a cascade vane segment, you must remove the components that follow: the adjacent cascade vane segment, the access panel for the hydraulic actuator, and the rod end of the hydraulic actuator from the thrust reverser sleeve.
C. You cannot operate the engines in reverse thrust for ground maintenance if all of the cascade vane segments are not there.
D. You can operate the engines in forward thrust for ground maintenance only if you have the conditions that follow:
(1)
Deactivation of the thrust reverser for ground maintenance.
(2)
Not more than three cascade vane segments which are not there on each thrust reverser half.
(3)
No two adjacent cascade vane segments which are not there on each thrust reverser half.
(4)
The top and bottom cascade vane segments nearest the top and bottom of each thrust reverser half must be installed.
E.
Do not lift or move the thrust reverser halves unless a minimum of three cascade vane segments are installed. The three cascade vane segments must have equal distance between them on each thrust reverser half with no more than two adjacent open spaces.
TASK 78-31-16-004-001-N00
2. Remove the Thrust Reverser Cascade Vane Segments
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A. References
(1)
AMM 27-62-00/201, Speed Brake Control System
(2)
AMM 78-31-00/201, Thrust Reverser System
(3)
AMM 78-31-17/401, Thrust Reverser Hydraulic Actuators
(4)
IPC 78-31-01 Fig. 5
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78-31-16
ALL ú ú N01 Page 401 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
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
C.
Prepare to Remove the Cascade Vane Segments
S 044-002-N00
WARNING: DO THE DEACTIVATION PROCEDURE FOR THE AUTOMATIC SPEED BRAKES.
_______ IF YOU DO NOT DO THIS, THE AUTOMATIC SPEED BRAKES CAN RETRACT QUICKLY WHEN YOU MOVE THE THRUST LEVERS. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Do this procedure: Automatic Speed Brake System Deactivation (AMM 27-62-00/201).
S 014-003-N00
(2)
Use the power method to extend the thrust reverser
(AMM 78-31-00/201).
S 044-030-N00
WARNING: DO THE THRUST REVERSER 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 this procedure: Thrust Reverser Deactivation for Ground
Maintenance (AMM 78-31-00/201).
D.
Remove the Cascade Vane Segments (Fig. 401 and 402).
(1)
Remove the bolts which attach the cascade vane segment.
S 024-005-N00
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78-31-16
ALL ú ú N01 Page 402 ú Feb 10/94
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