Autopilot mode - heading hold (CAP)

[muffler]

Autopilot mode - heading hold (CAP).

According to manual - pilot can move heading index relative to compass card by menace roll trim control switch. This feature doesn't work now. Will it be implemented in the future?

[MAXsenna]

Does this mean we should be able to move the index with the trim hat?
If it doesn't work now, I would guess it's sort of the same issue with the trim hat, that works upside down now, when in autopilot mode.

[Fromthedeep]

Any update on this?

[IvanK]

This is subject to discussion in the Beta area. There would appear to be a couple of variations available in the F1 depending on the exact model and operator.

At present in the AERGES F1 you can utilize the CAP AFFICHE rotary control on the right console to set the Navigation index on the Nav display. If the AP is in CAP mode it will follow the heading bug. If however you use the Roll trim (AP engaged in CAP) in an attempt to set the index all that happens is roll trim is applied with obvious undesirable consequences. At present  in the F1 Roll trim beep function is not modeled.

Now the various publicly available F1 pilot manuals (F1CZ,F1AZ,F1ED,F1AD) make no reference to the CAP AFFICHE knob/control. They detail the procedure as described by Muffler excerpt in using Roll Beep trim to set the heading index for use by the AP in CAP mode to turn on to a selected heading. At all other times the heading index is locked to the lubber line. No CAP AFFICHE control fitted.

The CAP AFFICHE control does exist in at least some Mirage F1's at least it would seem in the F1CE (Spanish) and the F1CG (Greek). The question then is how is it used and how does it or does not interface with the AP ?

To me there are Three plausible options... needs to be confirmed by a Manual ref that details CAP AFFICHE operation .... anyone got one ?

OPTION 1

The CAP AFFICHE control is used with both AP OFF or ON to set the desired heading on the index. With AP Off it is a pilot convenience thing. With AP on and in CAP mode the AP  will fly to the selected heading. Beep roll trim not fitted in these aircraft. (Certification/logic/safety would require roll trim to be deactivated with AP on ... though a strange option given Pitch beep trim function is modeled)

OPTION 2

The second option is that it is used to preselect the desired heading with AP off. When CAP is then selected the AP flies to that heading. With AP on roll beep trim is then used to set the desired heading and CAP AFFICHE control is deactivated.

OPTION 3

Same as option 2 but either Beep roll trim or CAP AFFICHE input can be used to set the desired heading.

Edited August 30, 2022 by IvanK

[Vatikus]

I think that Omnibearing is used only in Radio navigation. Using trim hat (0.8deg in pitch, 2deg in az; new heading if longer hold) is to make fine corrections under AP however if used in active Radio navigation it should disengage from it to normal AP.

Edited August 31, 2022 by Vatikus