Airworthiness Directive · Amendment 39-8861 · Honeywell International Inc. Engines
Honeywell International Inc. Engines
This AD applies to Honeywell International Inc. TFE731-2A, TFE731-3, TFE731-3A, TFE731-3AR, TFE731-3B, TFE731-3BR, TFE731-3R.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment supersedes an existing priority letter airworthiness directive (AD), applicable to certain AlliedSignal, Inc. TFE731-2A and -3 series turbofan engines, that currently requires a revision to the Limitations Section of the Airplane Flight Manual (AFM) to provide procedures for monitoring engine performance in order to detect A5 seal cracking and opening before first stage low pressure (LP) turbine disk failure. Additionally, the revision to the AFM requires a procedure for verification of LP rotor (N1) rotation during engine start to detect rotor lockup due to first stage LP turbine rotor creep. This amendment maintains those requirements for engine and flight data monitoring, adds a more stringent procedure for verifying rotor lockup during engine start and for detection of rubbing noises, and requires replacement of A5 seals with a redesigned seal. Replacement of A5 seals with a redesigned seal constitutes terminating action to the monitoring requirements.This amendment is prompted by reports of an additional first stage LP turbine disk failure due to A5 seal cracking. The actions specified by this AD are intended to prevent uncontained failure of the first stage LP turbine disk.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Engines
