The Australian Transport Safety Bureau (formerly the Bureau of
Air Safety Investigation) recommends that the US Federal Aviation
Administration notify all operators under their jurisdiction using
Rolls Royce RB211-524D4 or similar engines, of the possibility of
failure of the cold stream nozzle during operation.
This memo is in response to Federal Aviation Administration
(FAA) Safety Recommendations 00.010 and 00.011. The recommended
action is to prevent conditions that caused an uncontained cold
stream nozzle failure in a Rolls-Royce plc RB211-524D4 engine
model. Cold stream nozzle failure is attributed to cracking and
delamination of the acoustic liner at the top right side of the
cold stream nozzles resulting in departure of nozzle sections from
the engine. The failure resulted in sections of the cold stream
nozzle departing the engine and impacting a number of the aircraft
wing leading edge panels and the number 1 flap fairing.
Recommendation 00.010: The Australian Transport Safety Bureau
(formerly the Bureau of Air Safety Investigation) recommends that
"the U.S. Federal Aviation Administration notify all operators
under their jurisdiction using Rolls Royce RB21 1 524D4 or similar
engines, of the possibility of failure of the cold stream nozzle
during operation."
Engine Certification Office (ECO) Response: The FAA agrees with
Recommendation 00.010, however, there are no operators at aircraft
powered by RB211-524D4 engines registered in the U.S. The action
required for recommendation 00.011 will provide sufficient notice
to any future operators of these engines.
