カンタス航空QF32便エアバスA380事故についてのオーストラリア政府説明。中圧タービンに疑いあり。

オーストラリア政府航空安全局(Australian Transport Safety Bureau)によると、中圧タービン・ディスクが破損しているようです。

failure of the Intermediate Pressure (IP) turbine disc

タービンそのものより、ディスクの破損は深刻です。材料欠陥か製造工程のミス(熱処理ミス、加工ミス)等が疑われます。(予断は危険ですが。)

今後の調査結果を注視していきましょう。

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原文です。
http://www.atsb.gov.au/publications/investigation_reports/2010/aair/ao-2010-089.aspx


On 4 November 2010, at 0157 Universal Coordinated Time (UTC), an Airbus A380 aircraft, registered VH-OQA (OQA), being operated as Qantas flight 32, departed from runway 20 centre (20C) at Changi Airport, Singapore for Sydney, New South Wales. On board the aircraft were five flight crew, 24 cabin crew and 440 passengers (a total of 469 persons on board).

Following a normal takeoff, the crew retracted the landing gear and flaps. The crew reported that, while maintaining 250 kts in the climb and passing 7,000 ft above mean sea level, they heard two almost coincident 'loud bangs', followed shortly after by indications of a failure of the No 2 engine.

The crew advised Singapore Air Traffic Control of the situation and were provided with radar vectors to a holding pattern. The crew undertook a series of actions before returning the aircraft to land at Singapore. There were no reported injuries to the crew or passengers on the aircraft. There were reports of minor injuries to two persons on Batam Island, Indonesia.

A subsequent examination of the aircraft indicated that the No 2 engine had sustained an uncontained failure of the Intermediate Pressure (IP) turbine disc. Sections of the liberated disc penetrated the left wing and the left wing-to-fuselage fairing, resulting in structural and systems damage to the aircraft.

As a result of this occurrence, a number of safety actions were immediately undertaken by Qantas, Airbus, Rolls-Royce plc and the European Aviation Safety Agency. On 1 December 2010, the ATSB issued a safety recommendation to Rolls-Royce plc in respect of the Trent 900 series engine high pressure/intermediate pressure bearing structure oil feed stub pipes. In addition, the Civil Aviation Safety Authority issued a Regulation 38 maintenance direction that addressed the immediate safety of flight concerns in respect of Qantas A380 operations with the Trent 900 series engine. On 2 December 2010, Qantas advised that the requirements of Rolls-Royce plc Service Bulletin RB211-72-G595 would take place within the next 24 hours on engines in place on A380 aircraft currently in service, and before further flighton engines on aircraft not yet returned to service.

The investigation is continuing.

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カンタス航空QF32便エアバスA380事故についてのロールス・ロイス社の声明(その2)。
http://44579446.at.webry.info/201011/article_47.html

カンタス航空QF32便/エアバスA380搭載のエンジンTrent900
http://44579446.at.webry.info/201011/article_15.html

カンタス航空QF32便エアバスA380事故についてのロールス・ロイス社の声明。
http://44579446.at.webry.info/201011/article_13.html

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