Airworthiness Directives; Rolls-Royce Limited, Aero Division-Bristol, S.N.E.C.M.A. Olympus 593 Mk. 610-14-28 Turbofan Engines

This amendment adopts a new airworthiness directive (AD) that is applicable to Rolls-Royce Limited, Aero Division-Bristol, S.N.E.C.M.A. (RR) Olympus 593 Mk. 610-14-28 turbofan engines. This action requires replacement of the low-oil pressure (LOP) switch. This amendment is prompted by a report of the failure of the low pressure (LP) and high pressure (HP) rotor thrust bearings due to oil starvation that was caused by the loss of the LOP switch function and resulted in a delayed engine shutdown. The actions specified in this AD are intended to prevent the failure of the LOP switch to indicate an LOP event, which could contribute to uncontained engine failure due to oil starvation in the thrust bearings.