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75-31-00
ALL ú ú N01 Page 602 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(12)
IPC 72-35-59 Fig. 1
(13)
IPC 75-31-02 Fig. 5
C.
Access
(1)
Location Zone
412 Engine 1 - HPC Fwd Case
422 Engine 2 - HPC Fwd Case
432 Engine 3 - HPC Fwd Case
442 Engine 4 - HPC Fwd Case
(2)
Access Panel
415 and 416 Thrust Reverser Halves - Engine 1
425 and 426 Thrust Reverser Halves - Engine 2
435 and 436 Thrust Reverser Halves - Engine 3
445 and 446 Thrust Reverser Halves - Engine 4
D.
Prepare for the Inspection
S 016-012-N00
(1) Open the fan cowl panels (AMM 71-11-04/201).
S 016-011-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.
(2)
Do this procedure: Thrust Reverser Deactivation for Ground Maintenance (AMM 78-31-00/201).
S 016-013-N00
(3)
Open the core cowl panels (AMM 71-11-06/201).
S 016-014-N00
WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00 WHEN YOU OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(4)
Open the thrust reversers (AMM 78-31-00/201).
S 216-003-N00
(5)
Visually examine the actuator of the variable stator vane for cracks.
(a) If the cracks cause fuel leakage, replace the actuator (AMM 75-31-02/401).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
75-31-00
ALL ú ú N02 Page 603 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 216-018-N00
(6)
Examine the variable vane actuating linkage for damage or looseness.
(a)
No worn areas or end play is permitted in the spherical rod end bearings in the connecting rods between the levers sets and the VSV unison rings.
(b)
If you find damage or looseness, you must replace the the worn or loose parts.
S 216-019-N00
(7)
Examine the stator vane arms and the retaining rivet pins of the Inlet Guide Vanes (IGV), and the 5th- thru 7th-stage vanes for correct installation, and for loose or detached vane arms.
(a)
If you find a loose vane arm, replace the synchronizing unison ring for that stage.
(b)
If you find a detached vane arm (the rivet pin is gone), remove the engine (AMM 71-00-02/401).
NOTE: A detached vane arm is a loss of a rivet pin attachment
____ to the synchronizing unison ring, an incorrect assembly of the vane trunnion, or a separation from the vane trunnion. Refer to PW Alert SB A72-419.
1) Refer to the PWA Engine CIR Manual for the applicable inspections.
(c)
Visually examine the bellcrank for damage.
(d)
Visually examine the unison rings for damage and cracks.
(e)
If the part(s) have damage, cracks, or if there are loose parts, replace or tighten as it is necessary.
(f)
If you replace a part because of this inspection, rig the stator vane control system.
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