Regulacje i polityka gospodarcza · 15.11.2002

Airworthiness Directives; Rolls-Royce plc Model RB211 Turbofan Engines

The Federal Aviation Administration (FAA) proposes to adopt a new airworthiness directive (AD) that is applicable to Rolls-Royce plc (RR) model RB211-535E4-B-37 and RB211-535E4-B-75 turbofan engines. This proposal would require removal from service of certain high pressure (HP) turbine discs before they reach newly established life limits. This proposal is prompted by the manufacturer's inspections and analysis of HP turbine discs that have accumulated high cycles. The analysis reveals these discs to be sensitive to corrosion-induced cracking in the disc rim cooling hole area, which could result in uncontained HP disc failure. The actions specified by the proposed AD are intended to prevent corrosion-induced cracking of the HP turbine disc which could cause an uncontained HP turbine disc failure and damage to the airplane.