AD NUMBER: 2003-12-15
MANUFACTURER: Rolls Royce (Correction) SUBJECT: Airworthiness Directive 2003-12-15 SUMMARY: This amendment adopts a new airworthiness
directive (AD), that is applicable to Rolls-Royce (RR) plc
RB211-535E4-37, RB211-535E4-B-37, and
RB211-535E4-B-75 series turbofan engines.
This amendment requires introducing an alternative technique to
ultrasonically inspect installed fan blades on-wing using a surface
wave ultrasonic probe. This action also adds the application of
Metco 58 blade root coating as an optional terminating action. This
amendment is prompted by the discovery of cracks on LPC fan blade
roots during an engine overhaul. The actions specified by this AD
are intended to detect cracks in LPC fan blade roots, which if not
detected, could lead to uncontained multiple fan blade failure, and
damage to the airplane.