Report released on Qantas engine problem

AN Australian Transport Safety Bureau investigation has concluded a separated turbine blade led to an engine malfunction on an international Qantas flight last year.

A Qantas Boeing 747-400 aircraft, was en route from Sydney to Singapore on May 9, 2011 when - while climbing from 36,000ft to 38,000ft - the crew noticed abnormalities from the aeroplane's No.4 engine, the Australian Transport Safety Bureau (ATSB) said on Wednesday.

"The indications included an increase in both the exhaust gas temperature and vibration levels," ATSB said in a statement.

"The flight crew reduced the engines thrust, however, the vibration continued near maximum levels and the engine was subsequently shut down."

The plane continued to Singapore for a safe landing and disembarkation of the passengers and crew.

Following an investigation into the incident, ATSB said on Wednesday the jump in the exhaust gas temperature and vibration from the engine was "a direct result of the failure and separation of a single intermediate-pressure turbine blade", which fractured.

In its safety message, the bureau said operators and maintainers of Rolls-Royce RB211-524 engines should be aware of the "potential for wear and degradation of the intermediate-pressure turbine blade interlocking shrouds".

But it said the probability of an intermediate-pressure turbine blade failure is extremely low, with only three reported occurrences across the RB211-524 engine operating history.

"While blade separation will likely cause malfunctions necessitating an in-flight engine shut down, the associated risks to the safety of continued flight are minor."

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Report released on Qantas engine problem

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