题目内容
Warning light and _____operate when any of the landing gear is not locked down and any of the engine throttles are retarded below a cruise power setting.
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Most airliners _____warning lights and horns.
A voice message system on some aircraft may give a clear _____ warning indication.
To _____ the ambiguity of a horn or buzzer, a voice message system is used in most airliners.
The _____ of advanced warning systems and effective crew training has made gear-up landing accidents in large aircraft extremely rare.
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