Airworthiness Directive · Amendment 39-9693 · Pratt & Whitney Division Engines
Pratt & Whitney Division Engines
This AD applies to Pratt & Whitney Division Military R-1340 Series, Wasp S1H1, Wasp S1H1-G, Wasp S3H1, Wasp S3H1-G.
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) that is applicable to Pratt & Whitney Wasp series and R-1340 series (military) reciprocating engines. This action requires initial and repetitive visual and dye penetrant inspections of the crankshaft counterweights for cracks, and replacement of cracked crankshaft counterweights with improved crankshaft counterweights. This amendment is prompted by reports of crankshaft counterweight cracking. The actions specified in this AD are intended to prevent engine failure due to crankshaft counterweight failure, which could result in damage to or loss of 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.
