correct as is ATC doesn't hold speed.

[Yeti42]

I noticed while doing a nav exercise that ATC hold doesn't hold speed over a long period of time, the speed gradually decreases, by the end of a 30 minute leg I've lost 5 knots.   This is a bit of a pain for TOT calculations and navigation.  Is this a bug or is it intended?  I can't see how it could be anything but a bug.

Method:
1. Set ATC at 420 kts
2. Engage BALT and CPL AP modes
3. Jet holds 420
4. Change pitch in order to force increase or decrease in speed > return to level flight (ATC remains engaged, not flashing)
Expected result:
ATC alters throttle to resume 420 Kts

Actual result:
ATC fails to target 420 kts, throttle does not move, ATC remains at the lowest speed reached during the pitch maneuver

 

 

ATC_test.miz.zip

[Coyle]

ATC holds true air speed, not what's in the HUD. It's working as intended.

[Yeti42]

9 minutes ago, Coyle said:

ATC holds true air speed, not what's in the HUD. It's working as intended.

Thanks, that explains it, the HUD is indicating CAS

[BIGNEWY]

Hi, thanks for the replies, yes this is correct as is.