Airworthiness Directive · Amendment 39-8927 · Pratt & Whitney Canada Corp. Engines
Pratt & Whitney Canada Corp. Engines
This AD applies to Pratt & Whitney Canada Corp. PW118A, PW123, PW124B, PW125B, PW126A.
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 airworthiness directive (AD), applicable to Pratt & Whitney Canada PW100 series turboprop engines, that currently requires rework or replacement of the intercompressor case (ICC), and replacement of the low pressure rotor speed (NL) sensor port sealing tube and the external air tube connecting the P2.5/P3 switching valve to the rear inlet case. This amendment additionally requires installation of an airflow deflector bracket nozzle assembly, or modification of the No. 5 bearing pressure air system. Finally, this action requires installation of a No. 5 bearing vent tube assembly and allows extension of the compliance interval for reworking or replacing the ICC. This amendment is prompted by the development of additional hardware that will further reduce the risk of internal oil fires in the ICC. The actions specified by this AD are intended to prevent fire in the engine ICC and nacelle cavities, inflight engine shutdown, and aircraft 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.
