karatecatman
Member
Joined: 19 Dec 2006
Posts: 8314
Location: Chennai -- INDIA
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 Posted: Wed Nov 04, 2009 12:44 am Post subject: Qantas pilots forgot to lower wheels |
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Qantas pilots forgot to lower wheels
Steve Creedy
November 04, 2009
QANTAS has stood down two pilots after a Boeing 767 landing in Sydney came within 700ft of the ground before the flight crew realised they had not lowered the plane's undercarriage.
The airline and the Australian Transport Safety Bureau have launched investigations into the October 26 incident. The pilots are due to be interviewed by authorities on Friday.
The crew on the Melbourne-Sydney CityFlyer service apparently recognised the problem and had started go-around procedures when they received a "gear too low" aural warning from the aircraft's enhanced ground proximity warning system.
It is understood investigators are looking at possible human error and a communication breakdown between the first officer and captain about who was lowering the landing gear.
According to a former Boeing 767 pilot, a crew on an instrument approach would normally start lowering the undercarriage when the plane was between 2000ft and 1500ft in order to ensure that it met requirements that the aircraft was stable and configured to land at 1000ft.
In visual conditions, the aircraft needed to be stable by 500ft, but lowering the gear at 700ft or even at 1000ft was still far too late, the pilot said.
Landing gear problems or gear-up situations were involved in 15 per cent of airline hull-loss accidents last year, according to an analysis by the International Air Transport Association.
But Qantas said yesterday that a crew failing to lower the undercarriage was extremely rare and it was taking the incident seriously. "The flight crew knew all required procedures but there was a brief communications breakdown," a spokeswoman said.
"They responded quickly to the situation and instigated a go-around. The cockpit alert coincided with their actions. There was no flight safety issue.
"The incident was reported to the ATSB and the pilots were stood down. We are supporting the ATSB's investigation and our own investigations will determine what further action might be warranted."
The 767 incident happened just two days before the autopilot disconnected on a Jetstar A330-200 on route to the Gold Coast from Tokyo after it experienced a speed-sensing problem similar to one linked to the crash of an Air France jet in June.
A pitot probe, a small sensor that measures air pressure and is crucial to calculating airspeed, may have iced up and caused an incorrect airspeed reading as the A330-200 travelled through a storm.
Crew on flight JQ12 received error messages from the aircraft's electronic management system and saw readings on an airspeed indicator drop for about 10 seconds. But the problem also disconnected the autopilot and caused the flight control computers to switch from normal operation to a degraded mode known as alternate law.
The jet's 200 passengers were unaware of the problem and it landed safely on the Gold Coast where its pitot probes were replaced.
Malfunctioning pitot probes and false airspeed readings have been raised as possible factors in June's Air France crash in the Atlantic, which killed all 228 people on board. Problems with the speed sensing system on A330s, which includes a unit known as an air data inertial reference unit, were also responsible for taking an A330-300 on a wild ride across West Australian skies last October.
The ATSB has launched an investigation into the incident involving the Jetstar A330 but a spokesman said it was too early to say what caused the problem.
"We're concerned about it," the spokesman said.
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