A VALVE from an oxygen cylinder blasted a hole at least 20 centimetres in diameter in the floor of the passenger cabin of the Qantas 747 stricken in last week's mid-air emergency.
"We recovered a valve from an oxygen cylinder," Neville Blyth, a senior investigator with the Australian Transport and Safety Bureau, told a news conference yesterday. "It is likely that that valve is from the missing cylinder."
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An oxygen cylinder had never before exploded mid-air on a passenger aircraft, a Civil Aviation Safety Authority spokesman, Peter Gibson, said yesterday. He confirmed the oxygen cylinder was missing, and would be a key focus of the bureau investigation.
"If it turns out that is the cause of the accident, the cause of the hole in the side of the aircraft, obviously that will be a key part of the investigation - working out why a bottle would suddenly give way," he said.
Last night, a Melbourne-bound Qantas flight had to return to Adelaide soon after take-off because a mechanical problem.
A Qantas spokeswoman confirmed that flight QF692 "performed a routine air-turn back … due to an indication that one of their landing gear doors failed to retract".
"The aircraft (a Boeing 737-800) landed without incident and all passengers were accommodated on other flights. There was no safety risk at any time," she said.