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Until the two units are talking you will never get GPSS to activate. You first need to fix the issue of why you don't get the flashing "A" when switched to the Aspen. Either miswired or misconfigured. After that you need an active flight plan for GPSS to be available. And just an FYI - you...

I know this is an old post but in case anyone runs across it before they buy the E5 let me clarify. For some unknown and stupid reason, that Aspen has yet to give me an acceptable answer for, the Aspen ACU (Analog Control unit) is REQUIRED even for Digital autopilots. Even though it does nothing...

Typical response from Bendix - so I guess we just try it and see if it works then complain if it doesn't (but according to the note they don't plan to update this AP anytime soon.) - Really wishing I'd of bought a different autopilot now. Here is the response: Thank you for contacting...

Lynn - just so we are clear - your setup is already using the Low speed setting. So you can ignore anything to do with the high speed as it's irrelevant. Your IFD540 is configured on the 429 bus that is connected to the AP switch and intern to the Autopilot, is set on low speed currently. The...

I'm sure they didn't take anything away and I assume someone tested that but who know. The list I gave above didn't show if a label was provided at both speeds so I assume that Select Course is actually what you are thinking about (label 100). On another note Bendix King is being their typical...

Here is the old list of labels for reference - read the notes at the bottom: ARINC Label EFD Parameter ARINC Transmit Rate* 100(1) Selected Course 200ms 105 Heading Datum 50ms 173 Lateral Deviation 50ms 174...

You are already using low speed as that is all the AP will take. So you will have everything you have now plus more from the Aspen once updated. I have a list somewhere in an old email sowing what labels were being sent before and it was a lot less than the new list. I spoke with BK and they...

I can't post links here yet but go to Aspens website for the E5 and look at the Service Bulletin TN2023-01. It lists all the low and high speed labels now included.

I understand that the Aspen E5 software 2.12 version released in Feb 23 now includes a number of additional labels on the 429 low speed bus. There should be enough now for vertical guidance and altitude bug functionality. Has anyone done the update and if so does the Aerocruze accept the labels...