Airworthiness Directive · Amendment 39-10133 · Pratt & Whitney JT8D Series Turbofan Engines
Pratt & Whitney JT8D Series Turbofan Engines
Pratt & Whitney (PW) Models JT8D-1, -1A, -1B, -7, -7A, -7B, 9, -9A, -11, -15, -17, and -17R turbofan engines, with 4th stage low pressure turbine (LPT) hubs identified by serial number (S/N) in Table A of PW Alert Service Bulletin (ASB) No. A6274, Revision 1, dated December 9, 1996. These engines are installed on but not limited to Boeing 727 and 737 series, and McDonnell Douglas DC-9 series aircraft.
This amendment adopts a new airworthiness directive (AD), applicable to Pratt & Whitney JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, -17, and -17R series turbofan engines, that requires initial and repetitive fluorescent penetrant and eddy current inspections of 4th stage low pressure turbine (LPT) hubs for cracks, and, if necessary, replacement with serviceable parts. This amendment is prompted by a report of an uncontained 4th stage LPT blade release. The actions specified by this AD are intended to prevent a 4th stage LPT blade release due to hub cracking, which can result in an uncontained engine failure and damage to the aircraft.
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.
