Bearing box oil leak caused QF32 engine failure – Leahy

written by australianaviation.com.au | November 12, 2010
Open for inspection - a Trent 900 on Qantas A380 VH-OQC. (Damien Aiello)

Rolls-Royce has found a fix to its troubled Trent 900 engine in the wake of last week’s uncontained failure of one of the engines on a Qantas A380, Airbus chief operating officer – customers, John Leahy, previewed media in Sydney on November 12.

“Rolls knows they’ve found the solution to what caused the problem,” Leahy, in Sydney for Qantas’s 90th anniversary celebrations, said. “Oil could leak out of an engine bearing box,” he explained.

As an interim fix, Rolls-Royce has developed a software change to the engine’s FADEC system which will pre-emptively shut down an engine should it detect the preliminary signs of a failure.

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“We can see what happened now,” Leahy said of the QF32 failure. “The computer can see it.”

A more permanent fix will involve removing affected engines and disassembling them to fix the affected area, although Leahy couldn’t say how long that process would take per engine. New Trent 900 engines will also be removed from A380s on the production line in Toulouse and swapped onto airline customer aircraft replacing affected engines, although Leahy didn’t expect that process to affect the delivery of three A380s due to Qantas before the end of the year.

Leahy said engines on the production line have been built to a later design standard, and aren’t expected to have the same fault that led to the QF32 failure.

“These are all to a new build standard and they should not have any issues,” Leahy said, “we think the engines on the production line are fine”.

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Subsequent to Leahy’s comments, Rolls-Royce issued a statement detailing further information about the cause of the failure.

“These investigations have led Rolls-Royce to draw two key conclusions,” the November 12 statement reads. “First, as previously announced, the issue is specific to the Trent 900. Second, the failure was confined to a specific component in the turbine area of the engine. This caused an oil fire, which led to the release of the intermediate pressure turbine disc.”

Continues the statement, “Our process of inspection will continue and will be supplemented by the replacement of the relevant module according to an agreed program.”

“I am now delighted they have found a solution,” Leahy said.

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3 Comments

  • Alan Nicholson

    says:

    “release of the IP turbine disc”……….good grief, talk about understatment. How does an oil fire do that?

  • Neville Lee

    says:

    If RR knew there was a problem with the module how come Qantas and SIA didn’t know?

  • Kevin

    says:

    Why was there a up grade to the design standard that would now resolve the leek problem? Perhaps it was known there was a potential problem hence the up grade.

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