FMS managed autothrust on Cessna Citation longitude misconfigured

User Support Hub Aircraft & Systems
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1

ISSUE DESCRIPTION

Description of the issue:

The cessna citation longitude can not be run on Autothrust for longer when FMS managed. The speed target is set so high, that the plane will automaticly creep into overspeeding. The targetvalue is Mach 0.84, which results in overspeed. So you can’t trust the plane’s own selfmanagement. The target value should be mach 0.82 or so, that the plane’s own management respects the planes limitations.

FREQUENCY OF ISSUE

How often does this occur for you (Example: Just once, every time on sim load, intermittently)?

Always

REPRODUCTION STEPS

Please list clear steps you took in order to help our test team reproduce the same issue:

  1. Fly citation longitude at FL 410

  2. Activate autothrottle on fms managed mode.

  3. Watch the speed go into the red area and the alert go off.

YOUR SETTINGS

If the issue still occurs with no mods and add-ons, please continue to report your issue. If not, please move this post to the User Support Hub.

PS5, dualsense

2

Needs optimization.

Maybe there is a way the maximum speed of the fms speed management? If so, please tell me.

3

This is exactly how the default setting is in real life as well, this is not a bug. Pilots will fly the plane right up against the barberpole. Some real-world pilots find the slight flashing into overspeed annoying, so they’ll set it in the VNAV page on the GTC to 0.83 or 0.82. But it’s not harmful, and matches the real aircraft.

4

Yeah, I found out about this setting few days ago myself. Yes, I set it to 0.80 to be able to go to higher simrates. Fortunately these values seem to saved between flights.