Tuesday, February 15, 2011

"Unscheduled Maintenance" Grounds United 757 Fleet

"United grounds its Boeing 757 fleet"
CNN Travel (February 15, 2011)

"United Airlines has grounded 96 Boeing 757 airliners for 'unscheduled maintenance,' an airline spokesman said Tuesday.

"The grounding meant that some of the airline's flights would be canceled or delayed Tuesday night and Wednesday, spokesman Rahsaan Johnson said.

" 'Specifically ... United is performing follow-up maintenance checks starting today to the air data computers on its 96 Boeing 757s,' Johnson said. 'All of the air data computers are fully functional. The checks are necessary as part of a modification process to the system.'..."

That was "unscheduled maintenance," but apparently not unexpected. Work on the Boeing 757 computers connects with a 2004 Federal Aviation Administration airworthiness directive. The idea is that flight crews will now be able to stop an overspeed warning, or stall warning, that's going off when the airliner's flying normally.

Makes sense to the Lemming. Although it does raise the question of what happens if the airliner starts misbehaving - after the alarm's been turned off.

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