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JeffEvans

747-X Autothrottle problem inflight

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Occasionally during a flight the autothrottle will not control the throttles. The AT is turned on and I have tried turning it off and then on again... still no help. What can cause this and how can it be remedied in flight. The only alternative is to manually control the throttles which can be a pain on an extremely long flight. By the way, I do not have any failures turned on in the sim.Thanks, Jeff EvenRocklin, CA, USA

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Might have been a soft A/T disconnect due to turbulence. Confirm the FMA readout that a A/T mode is active. If the FMA is blank, you'll need to exit VNAV by pressing Altitude Hold, then select Speed on the MCP. Once the Speed buttin is illuminated and the FMA reads a active A/T mode, you can then go back to VNAV.

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Might have been a soft A/T disconnect due to turbulence. Confirm the FMA readout that a A/T mode is active. If the FMA is blank, you'll need to exit VNAV by pressing Altitude Hold, then select Speed on the MCP. Once the Speed buttin is illuminated and the FMA reads a active A/T mode, you can then go back to VNAV.
Thanks. I'll keep this ino handy and try it next time it happens.

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