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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
~....................................................... | SB | Service Bulletin | ......................................................... | SSM | System Schematics Manual | ......................................................... | SW | switch | ......................................................... | TACH | Tachometer | ......................................................... | TAI | Thermal Anti-Ice | ......................................................... | TAP | Total Air Pressure | ......................................................... | TAT | Total Air Temperature | ......................................................... | TCA | Turbine Cooling Air | ......................................................... | TCC | Turbine Case Cooling | ......................................................... | TLA | Thrust Lever Angle | ......................................................... | TRA | Thrust Resolver Angle | ......................................................... | TSFC | Thrust Specific Fuel Consumption | ......................................................... | TT2 | Inlet Total Temperature | ......................................................... | TVBCA| Turbine Vane and Blade Cooling Air | ......................................................... | TVC | Turbine Vane Cooling | ......................................................... | V | Volt | ......................................................... | WDM | Wiring Diagram Manual | 2......…................................................1
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GUIDELINES FOR REUSE OF DAMAGED ENGINES AND ENGINE PARTS -
__________________________________________________________ MAINTENANCE PRACTICES
_____________________
1. General_______
A. This procedure has the tasks that follow:
(1)
Abnormal Operation Circumstances - Engines and Engine parts Unacceptable for Continued Aircraft Usage
(2)
Abnormal Operation Circumstances - Engines and Engine Parts Potentially Acceptable for Continued Aircraft Usage
(3)
Serious Operational Events
(4)
"Impacted" and "Dropped" Engines
(5)
Tailpipe fires.
B. The following guidelines are provided to assist owners, operators and maintenance facilities in the disposition of engines and engine parts involved in Abnormal Operational Circumstances. Abnormal Operational Circumstances are defined as accidents or other events which fall outside of the operating envelope for the engine, aircraft or engine/aircraft combination as originally verified and where inspection, refurbishment, and repair data are not addressed by FAA approved publications, i.e., engine manuals, service bulletins, etc. The data contained in these FAA approved publications normally address engine and engine parts which experience wear, deterioration, or damage through exposure to the normal day-to-day operating environment. The guidelines apply to the following engine associated abnormal operational circumstances:
(1)
Engine and Engine Parts Unacceptable for Continued Aircraft Usage.
(2)
Engines and Engine Parts Potentially Acceptable for Continued Aircraft Usage.
C. For Abnormal Operational Circumstances not addressed by these guidelines, Pratt & Whitney considers engines and engine parts unacceptable for continued aircraft usage unless reviewed and approved on a case-by-cae basis.
D. The guidelines are based upon Pratt & Whitney's general experience in this area and, therefore, are to be used as general guidelines. In any particular incident, however, more complete information or inspection results may require alternate action. The engine or engine parts owner should not rely upon the information in these guidelines without a thorough understanding of the damage to the engine or engine parts and its effect on engine operation. It should be understood that the
________________________________ following are only guidelines and that any and all responsibility for
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