Rolls Royce Revises Service Bulletin On Trent 900 Engine
In the ongoing Australian Transportation Safety Bureau (ATSB)
investigation of an engine failure involving a Qantas A380 aircraft
over Batam Island, Indonesia on 4 November 2010, the ATSB issued a
safety recommendation that identified a potential manufacturing
defect with an oil tube connection to the high-pressure
(HP)/intermediate pressure (IP) bearing structure of the Trent 900
engine installed in some A380 aircraft.
That recommendation has prompted Rolls-Royce to immediately
issue Revision One to the non-modification service bulletin (NMSB)
72-G595 incorporating assessment and engine rejection criteria for
the measurement of potential oil feed stub pipe counter-bore
misalignment, and a tightening of the compliance time frame from 20
to 2 flight cycles.
Since the issue of that bulletin, 45 Trent 900 engines have been
inspected, and of those engines:
29 engines were installed on operating aircraft
8 engines were not installed on aircraft
4 engines were due to be delivered on a new aircraft
4 engines were on a flight test aircraft.
Three engines failed the inspection and were removed from
service for further examination. All Qantas aircraft engines
currently flying had no defects recorded and remain in
In addition, the European Aviation Safety Agency (EASA) approved
software updates to the Rolls-Royce plc change to the engine
electronic control system has now been incorporated in all
operating aircraft. The software upgrade predicts intermediate
turbine overspeed events and shuts the engine down before a turbine
disc failure occurs.