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Fri, Aug 29, 2003

AD: Rolls-Royce

AD NUMBER: 2003-17-15
MANUFACTURER:
Rolls Royce
SUBJECT: Airworthiness Directive 2003-17-15


SUMMARY: This amendment supersedes an existing airworthiness directive (AD) that applies to Rolls-Royce plc. (RR) models RB211-535E4-37, RB211-535E4-B-37, and RB211-535E4-B-75 turbofan engines, with certain part number (P/N) low pressure (LP) turbine stage 2 discs installed. That AD currently requires establishing new reduced LP turbine stage 2 disc cyclic limits. That AD also requires removing from service affected discs that already exceed the new reduced cyclic limits,and removing other affected discs before exceeding their cyclic limits, using a drawdown schedule. This amendment requires changing certain cyclic limits, changing the effective date ofcertain disc cyclic lives, and would allow intermix of Flight Plan A and Flight Plan B intermix calculations. This amendment is prompted by a reassessment of the thermal and stress data from recent operational experience and comments received from operators on the current AD. We are issuing this AD to prevent LP turbine stage 2 disc failure, which could result in uncontained engine failure and possible loss of the airplane.

FMI: www.avantext.com/DailyADIndex.ASP?AD=20031715

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