AD NUMBER: 2007-14-07
MANUFACTURER: Rolls Royce
SUBJECT: Airworthiness Directive 2007-14-07 SUMMARY: The FAA is adopting a new airworthiness
directive (AD) for certain Rolls-Royce plc (RR) RB211-524 and -535
series turbofan engines.
This AD requires initial and repetitive fluorescent penetrant
inspections (FPI) of the high pressure (HP) compressor stage 1 and
2 rotor discs for cracks.
This AD results from reports of low-cycle-fatigue cracks found
at overhaul in the interface weld between the HP compressor stage 1
and 2 rotor disc.
We are issuing this AD to prevent uncontained engine failure and
damage to the airplane.