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Boeing707

failure of the Auto Pilot, not able to activate the AP

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Hello!

Please could you help me?

After take off with the Boeing 737 900 NGX, I activated the Flight director and the speed control, all was working perfect

Then (of course) I wanted to activate the Auto Pilot and I pushed one of the four Auto Pilot buttons, BUT NO reaction of the system!

Only a little part of a second, the button flashed with a blue light, but this was all

According this, I was not able to cruise with AP and was not able to climb up automaticly to the selected flight high etc

What is the reason for this failure of the Auto Pilot ?

Thank you so much for your answer in advance

Best greetings

Arno

Vienna Austria

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Do you have service based failures on? How did you disconnect the autopilot on the previous flight? If you yanked the yoke violently, you could have broken the autopilot shear pins. Check the cdu maintenance page and see what it says.

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Hi Arno!

You also want to check that in the options page of the FMS if "realistic AP engagement" is selected on or off. If it is on the aircraft has to be correctly trimmed and stable before the AP can be engaged by pressing CMD A or B.

Hope it helps!

Matteo Capocefalo MED1473

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As Matteo mentioned if the aircraft is not correctly trimmed and settled nicely on the flight director it will not engage. Make sure you are not pulling, pushing etc on the stick before engaging and you should be ok.

 

Pretty sure this is explained in the tutorials though.

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Keep the control colunm and wheel in the center position before engaging the autopilot. Also make sure the Main and A/P Stab Trim cut out switch's on the control stand is in the normal position.

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You cant be pulling on the yoke an engage it at the same time. I had this problem as well. Just level out and let go and it will work

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