Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Pratt & Whitney R-1340 series reciprocating engines. This proposal would require initial and repetitive visual and fluorescent penetrant inspections of cylinders, Part Number 399359, for head cracking. This proposal is prompted by reports of cylinder head cracking. The actions specified by the proposed AD are intended to prevent cylinder head cracking, which can result in engine power loss, forced landing, and damage to the aircraft.