IFD540 out for maintenance no mode C

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   I think I know the answer after reading a few posts here and asking around, but just want to make sure it's the right answer and wether there is a way around it.
So my IFD540 was sent to the factory with a com issue. Since I have a #2 radio, I decided to continue my VFR flying using it and bringing a portable Vertex radio just in case. What's is the link with the transponder you'll say, well here it is; our IFD540 being out of it's rack, the connection between the mode C and the transponder seems to be interrupted and ATC doesn't receive our altitude, although the AXP340 is in the Alt mode and there is no altitude on the transmitted altitude display.

Questions for @AviSteve or somebody at Avidyne:
1- Is there a way around that situation not using the  controls on the IFD540?
2- When the IFD is back, is there a connection that can be made to make sure the AXP340 doesn't need the IFD for it's mode C information?

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drapo Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 27 Apr 2015 Location: Lachute QC Status: Offline Points: 19	Post Options Post Reply Quote drapo Report Post Thanks(0) Quote Reply Topic: IFD540 out for maintenance no mode C Posted: 26 Sep 2020 at 1:18pm
	I think I know the answer after reading a few posts here and asking around, but just want to make sure it's the right answer and wether there is a way around it. So my IFD540 was sent to the factory with a com issue. Since I have a #2 radio, I decided to continue my VFR flying using it and bringing a portable Vertex radio just in case. What's is the link with the transponder you'll say, well here it is; our IFD540 being out of it's rack, the connection between the mode C and the transponder seems to be interrupted and ATC doesn't receive our altitude, although the AXP340 is in the Alt mode and there is no altitude on the transmitted altitude display. Questions for @AviSteve or somebody at Avidyne: 1- Is there a way around that situation not using the controls on the IFD540? 2- When the IFD is back, is there a connection that can be made to make sure the AXP340 doesn't need the IFD for it's mode C information?

AviSteve Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 12 Feb 2018 Location: Melbourne, FL Status: Offline Points: 2246	Post Options Post Reply Quote AviSteve Report Post Thanks(0) Quote Reply Posted: 28 Sep 2020 at 8:55am
	The AXP340 can accept altitude inputs from other sources than the IFD. For instance, an Icarus encoder or an air data computer. Your installer probably already knows the options available to you given the equipment installed in your aircraft. Have him contact Avidyne tech support for assistance if necessary.
	Steve Lindsley Avidyne Engineering

drapo Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 27 Apr 2015 Location: Lachute QC Status: Offline Points: 19	Post Options Post Reply Quote drapo Report Post Thanks(0) Quote Reply Posted: 28 Sep 2020 at 3:25pm
	Thanks!