Summary
The Federal Aviation Administration (FAA) proposes to adopt a new airworthiness directive (AD) that is applicable to Rolls-Royce plc (RR) Spey 506-14A, 555-15, 555-15H, 555-15N, and 555-15P turbojet engines. This proposal would require replacing certain stage 2 low pressure turbine (LPT) blades with new redesigned stage 2 LPT blades. This proposal is prompted by several reports of failures of stage 2 LPT blades. The actions specified by the proposed AD are intended to prevent failure of the stage 2 LPT blades, which could result in an engine shutdown.