completely torn down and all engine parts inspected.
2) If extinguishing agents have been applied to the engine, gaspath cleaning is to be accomplished per the appropriate engine manual, as quickly as practical, to prevent corrosion.
TASK 70-00-02-912-011-N00
5. "Impacted" and "Dropped" Engines________________________________
A. General
(1) The damage or circumstances which can result in an "Impacted" engine include impact with the ground, a collision with a service vehicle, etc. An engine dragged on the ground or against another object is considered an impacted engine. "Dropped" engines refer to engines which are dropped entirely or on either end.
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B. References
(1)
AMM 71-00-02/401, Power Plant
C.
Access
(1)
Location Zones
412 No. 1 Power Plant
422 No. 2 Power Plant
432 No. 3 Power Plant
442 No. 4 Power Plant
D.
Procedure
S 912-026-N00
(1) Inspection requirements for impacted and dropped engines are similar and progressive in scope; that is, proceeding with further teardown is dependent on the degree of damage found at each level of inspection.
(a)
For engine mounted on aircraft where pylon or nacelle damage has occurred, inspect engine mount flanges, cases, external components and plumbing, and gearbox housing and mounts. If the impact was such that debris may have entered the engine inlet, inspect engine for ingestion, and check bleed system filters and valves for debris. 1) If no damage is noted, no further action is required. 2) If damage is noted to external components and plumbing,
replace damaged items. 3) If damage is noted to mount flanges, gearbox, or gearbox mounts or cases, remove the engine (AMM 71-00-02/401). 4) Monitor chip detectors and oil filter on a more frequent basis during the initial return of the engine to service.
(b)
For dropped engines, removal and disassembly are required.
TASK 70-00-02-912-014-N00
6. Tailpipe Fires
______________
A. References
(1) AMM 71-00-02/401, Power Plant
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B. Access
(1) Location Zones
412 No. 1 Power Plant
422 No. 2 Power Plant
432 No. 3 Power Plant
442 No. 4 Power Plant
C. Procedure
S 912-027-N00
(1) In general, tailpipe fires of short duration and extinguished by "motoring" the engine will probably have little detrimental effect on exhaust area engine parts (Refer to PWA Operating Instructions 190).
(a) Inspect exhaust area for signs of scorching. Any parts which exhibit scorching including fan duct acoustic liners if so equipped, should be replaced.
S 912-028-N00
(2) Engines which experience a more persistent tailpipe fire, or when starting overtemperature limits are exceeded during a tailpipe fire, present a greater potential for thermal stress. Engine removal is required (AMM 71-00-02/401).
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ASSEMBLY AND INSTALLATION - MAINTENANCE PRACTICES
_________________________________________________
1. General
_______
A. This is the basic procedure to disassemble and assemble an engine.
B. This procedure gives the data for the tasks that follow:
(1)
Maintenance Procedures
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本文链接地址：747-400 AMM 飞机维护手册 STANDARD PRACTICES - ENGINE(7)
