Glass version: Autopilot ALT ON light doesn't come up

[daemotron]

I was flying a short descent in cruise, using VS mode and ALT SEL armed, altitude pre-selected on the G500. When reaching the selected altitude, the VS and ALT SEL lights on the AP panel went off, and altitude was (at least seemingly*) captured, but the green ON light on the ALT button didn't light up. De-pressing and re-pressing the ALT button itself made the green ON light come up.

This seems to concern only the glass version, never had this in the GNS version.

*tbh I didn't wait long enough to determine whether it had really captured or not; my VS for the descent was pretty low (-200fpm).

[tkyler]

The MU2 autopilot has a "roundout" rate based feature.  So it should denote capture on the ALTSEL....but the ALT (hold) light itself won't illuminate until the final captured altitude...50' I IIRC.   It it doesn't illuminate at all clearly within 50' of target...certainly that's worth a look on my end.

TK