737 A/T ARM mode

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12th February 2014 | 02:44

#1 (permalink)

Swaccy

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Joined: Feb 2014

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From: sky

737 A/T ARM mode

Why Boeing didn't recommend the A/T to be armed during landing (deselect the existing) rather disengage the A/T? Doing this will let the auothrottle advance automatically to go around thrust during a single go around.

Q 2. I understand the A/T ARM mode provide underspeed protection, but why during takeoff mode thrust goes to THR HLD instead of ARM? If the mode would be "ARM" will this make the thrust to advance again in case of a rejected takeoff? If so, why? where is the "underspeed" in this situation?

12th February 2014 | 07:46

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aerostatic

Joined: Dec 2000

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From: Off track, again

Q1: My understanding is if a/c slightly slow approaching flare A/T will engage in MCP SPD and then at 27' RA engage in RETARD. If unexpected it could lead to a tail strike.

Q2: Actively prevents unwanted A/T activity, whereas ARM allows other modes to engage. This would be undesirable during takeoff.