Airworthiness Directive · Amendment 39-10830 · Pratt & Whitney JT9D Series Turbofan Engines
Pratt & Whitney JT9D Series Turbofan Engines
Pratt & Whitney (PW) Model JT9D-59A, -70A, -7Q, - 7Q3, and JT9D-7R4 series turbofan engines, with the following 14th and 15th stage high pressure compressor (HPC) disks installed: Part Numbers (P/N's) 5000814-01, 790014, 789914, 790114, 5000815-01, 5000815-021, 704315, 704315-001, 786215, 786215-001, 704314, 789814, and 790214. These engines are installed on but not limited to Airbus A300 and A310 series aircraft, Boeing 747 and 767 series aircraft, and McDonnell Douglas DC-10 series aircraft.
This amendment adopts a new airworthiness directive (AD), applicable to Pratt & Whitney JT9D series turbofan engines, that requires initial and repetitive eddy current inspections (ECI) of 14th and 15th stage high pressure compressor (HPC) disks for cracks, and removal of cracked disks and replacement with serviceable parts. This amendment is prompted by reports of disk bore cracks found during shop inspections on both the 14th and 15th stage HPC disks. The actions specified by this AD are intended to prevent 14th and 15th stage HPC disk rupture, which could 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.
