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When is the exact moment you are supposed to disconnect the A/T


Chris Catalano

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Straight off, I don't know. But I do know I would like to be in control of the throttle way before 50ft AGL. Wind strength and direction is not constant in the real world. You need to be ready for instant throttle input during approach and landing.

Bob

 

 

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Can someone please tell me the exact moment during a descent you are supposed to disconnect the Autothrottle?

For Cat 1, visual and non-precision, the answer is when you feel like it, but not below 50' (FAA) and 158' (JAA) or MDA.

 

Cat II and Cat III depends on equipment and SOPs.

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Since you didn't specify any other conditions than descent, the time to disconnect A/T is when you disconnect the autopilot, at whatever time that is, as you are not supposed to fly "half automatic" in the sense of A/P off, A/T on during any phase of flight other than takeoff or climb (FCTM 1.43). If that is at your TOD or on final doesn't make a great difference.

 

Other than that and as it has already been pointed out above, depending on the rules A/P and A/T need be disconnected as specified in FCOM 1 L.10.5 for single channel operation.

 

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777 this is normal, but that policy can't be implemented on a 737.

 

It can and that is exactly how it is done at my company.  The A/T is normally left engaged all the way until touchdown per our company procedures.  When left engaged they will begin to retard at 27' RA and will disengage two seconds after touchdown.

RL or virtual?

Very much real.

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