Airworthiness Directive · Amendment 39-9820 · Pratt & Whitney Division Engines
Pratt & Whitney Division Engines
This AD applies to Pratt & Whitney Division JT8D-1, JT8D-11, JT8D-15, JT8D-15A, JT8D-17, JT8D-17A, JT8D-17AR, JT8D-17R, JT8D-1A, JT8D-1B, JT8D-7, JT8D-7A, JT8D-7B, JT8D-9, JT8D-9A.
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 two existing airworthiness directives (ADs), applicable to Pratt & Whitney (PW) JT8D series turbofan engines, that currently require repetitive eddy current, fluorescent penetrant, fluorescent magnetic penetrant, or visual inspections for cracks in the rear flange, and ultrasonic, fluorescent penetrant, or fluorescent magnetic penetrant inspections for cracks in the PS4 boss, and drain bosses of the combustion chamber outer case (CCOC); and an additional inspection of the CCOC rear flange for intergranular cracking. This amendment requires reducing the rear flange inspection interval for CCOCs when only the aft face of the rear flange has been inspected, and introducing an improved ultrasonic probe assembly. In addition, this amendment introduces a rotating eddy current probe for shop inspections in which the case is removed from the engine. Also, this amendment eliminates fluorescent penetrant inspection (FPI), fluorescent magnetic particle inspection (FMPI), and visual inspections from hot section disassembly level inspection procedures. This amendment is prompted by reports of crack origins in the forward face of the rear flange that could not be detected by the inspection methods for installed CCOC's that were mandated in the current ADs. The actions specified by this AD are intended to prevent uncontained engine failure, inflight engine shutdown, engine cowl release, and airframe damage.
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.
