MANUFACTURER: Rolls-Royce plc RB211-Trent 500, 700,
and 800 Series Turbofan Engines SUBJECT: Airworthiness Directive 2010-07-01
SUMMARY: This AD results from mandatory
continuing airworthiness information (MCAI) issued by an aviation
authority of another country to identify and correct an unsafe
condition on an aviation product, and results from the risk of
engine fuel-to-oil heat exchanger (FOHE) blockage. The MCAI
describes the unsafe condition as:
In January 2008, a Boeing 777 powered by RB211-Trent 800 engines
crashed short of the runway as a result of dual loss of engine
response during the final stages of approach. The investigation of
the incident has established that, under certain ambient
conditions, ice can accumulate on the walls of the fuel pipes
within the aircraft fuel system, which can then be released
downstream when fuel flow demand is increased. This released ice
can then collect on the FOHE front face and limit fuel flow through
the FOHE. This type of icing event was previously unknown and
creates ice concentrations into the fuel system beyond those
specified in the certification requirements.
In May 2009, an Engine Indicating and Crew Alerting System (EICAS)
surge message was set following a successful go-around maneuver on
a single RB211-Trent 700 engine of an A330 aircraft. Subsequent
analysis concluded the likely cause to be temporary ice
accumulation causing fuel flow restriction in the FOHE. The
incident has indicated the potential susceptibility to ice blockage
for Airbus aircraft in combination with Rolls-Royce engines that
feature similar fuel systems to the RB211-Trent 800.
We are issuing this AD to prevent ice from blocking the FOHE, which
could result in an unacceptable engine power loss and loss of
control of the airplane.
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