Oil pipes caused Qantas explosion: ATSB A QANTAS jumbo's engine blew up in mid-air over Indonesia in 2010 because oil feed pipes did not conform to design specifications, Australia's transport watchdog says. There were 469 passengers aboard the Sydney-bound QF32 when a loud bang was heard on November 4, 2010. The aircraft, which had left Singapore's Changi Airport 15 minutes before the explosion, littered debris over Indonesia's Batam Island before turning back. In pictures: The QF32 engine explosion QF32 'was a flying wreck' The plane landed safely and no-one onboard was physically injured. But the accident sparked calls to ground the global A380 fleet and led Qantas to ground its six A380s for three weeks. The Australian Transport Safety Bureau released its third and final report into the accident on Thursday, which found that oil feed stub pipes in the A380s No. 2 engine did not conform to design specifications. The pipes in the A380's Trent 900 engines, manufactured by Rolls Royce Plc, were too thin because the boring machine hadn't been set to specifications. A thin pipe cracked under pressure and oil poured out during the flight, causing an internal fire. The fire heated the engine, and separated the pressure turbine disc from the drive shaft. The loose, rapidly spinning disc tore apart the engine, scattering debris over Bantam Island. Rolls Royce has since taken a range of actions to identify Trent engine hub assembly plants manufacturing non-conforming oil feed stub pipes - and either remove them from service or ensure that all component were built to specification. The ATSB report also absolved the crew of any error, saying they had completed the required actions for the multitude of system failures and safely landed at Changi Airport. No-one was physically injured, but a group of QF32 crew members have launched a class action against Rolls Royce Holdings Plc in the NSW Supreme Court, claiming psychological trauma. A Qantas spokesperson said: "We welcome the release of the ATSB's final report, which follows a comprehensive two-and-a-half year investigation that looked at every aspect of the incident. The report once again underlines the calm, skilful actions of the Qantas crew in returning the aircraft and its passengers safely to Singapore. After the incident, we immediately grounded our A380 fleet, only returning the aircraft to service when we and our regulators were 100 per cent satisfied that it was safe to do so. The response of the crew and Qantas employees on the ground was a testament to the outstanding safety and training culture that Qantas is known for, and we're pleased that the report reflects that.