IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM

AXP 322 fault

Printed From: Avidyne
Category: Avidyne General
Forum Name: IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM
Forum Description: Topics on Avidyne's IFD 5 Series and IFD 4 Series Touch Screen GPS/NAV/COM
URL: http://forums.avidyne.com/forum_posts.asp?TID=1804
Printed Date: 23 Apr 2024 at 2:03am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: AXP 322 fault

Posted By: embpic
Subject: AXP 322 fault
Date Posted: 17 Jul 2019 at 1:27pm

I recently had an IFD 540 installed with dual G5s, GAD29b and AXP322. I am getting a transponder fault and was hoping to get some help. My friend (Avionics tech) that installed it is unavailable for this week and I was hoping it might be something in the config settings. The install manual does not really reference the G5s or the GAD29b.

So here is the problem. After the install everything checked out fine. However after about 5 minutes in the air I get a 'Xpdr fault' message. The transponder does work until the fault message appears. I have had ATC radar identify me before the fault occurs. After the fault ATC only has a primary target on me. I cycled the power ater landing and the fault immediately appears again. Only after sitting for an extended period does the transponder work again for 5-10 minutes after takeoff. I am getting the correct GND and ALT indications for the transponder.

I am hoping it is something in the settings. Here is how it is currently set up.

Main ARINC 429 Config

Speed Data

-In1 Low Garmin GDU

-In2 Low off

-Out1 Low GAMA 429

-Out2 Low Off

Main RS232 config

Input Output

CH1 Off MapMx

CH2 AXP322 AXP 322

All other Channels are Off

Remote Xpdr

1090 Mhz receiver- Yes

UAT reciever - No

Squat input - Avidyne

Replies:

Posted By: embpic
Date Posted: 17 Jul 2019 at 1:31pm

Also the software has not been updated to 10.2.3.1 yet.

Posted By: eallevato
Date Posted: 18 Jul 2019 at 10:51am

I don't know about the AXP322, but on the Garmin GDL-82 the fault light comes on primarily under 2 conditions:

1) Loss of position data

2) Loss of altitude data

You did not indicate that you are losing GPS reception, so make sure that the 540 is getting altitude data from an encoder.

Gene

-------------
Gene

Posted By: embpic
Date Posted: 18 Jul 2019 at 8:04pm

Well I downloaded the logs and think I found the problem. Right before the fault message is displayed there is an error that says 'AXP322:Tx Power Low'. From what I can find it would seem the cable or antenna is causing a problem. My installer is going to make a new cable and bring a new antenna and see it that helps.