Airworthiness Directive · Amendment 39-8987 · Pratt & Whitney Division Engines
Pratt & Whitney Division Engines
This AD applies to Pratt & Whitney Division JT9D-20, JT9D-20J, JT9D-3A, JT9D-59A, JT9D-7, JT9D-70A, JT9D-7A, JT9D-7AH, JT9D-7F, JT9D-7H, JT9D-7J, JT9D-7Q.
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 adopts a new airworthiness directive (AD), applicable to Pratt & Whitney JT9D series turbofan engines, that requires a one-time modification and overhaul of engine control system accessories. This amendment is prompted by multiple engine surge and power loss events caused by deterioration of internal components of engine control system accessories. The actions specified by this AD are intended to prevent the loss of engine compressor surge margin caused by the deterioration of engine control system accessories, resulting in an engine surge, and subsequent power loss or inflight engine shutdown.
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.
