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To the Editor
Re "Inquiry Suggests Chance That Mechanical Failure Had Role in Crash" (news article, July 10):
If it is found that the pilots needed to manually activate or set the minimum speed on the auto-throttles of the Asiana jet, that means that the design was totally unacceptable. Auto-throttle should be fully automatic, period.
It should automatically prevent the landing speed from dropping below a safe limit. It should never need manual activation, and in fact, the pilot should only be allowed to increase the safety margin, but not to decrease it or to disable the system.
Similarly, to protect against mechanical failure, full backup should always be provided.
BÉLA LIPTÁK
Stamford, Conn., July 10, 2013
The writer is an automation and safety consultant and the editor of the Instrument and Automation Engineers' Handbook.
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