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G1000 intermittent Heading problems

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G1000 intermittent Heading problems

Old 1st Jun 2009, 14:40
  #1 (permalink)  
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Join Date: Oct 2006
Location: Bristol
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G1000 intermittent Heading problems

Has anyone else experienced intermittent G1000 magnetometer/AHRS failures on the ground/in-flight, causing the Heading Indicator to red X? Particularly in very warm weather and/or after when the aircraft has been parked over steel tie-down wires? (Not fixed by pulling the CBs; sometimes 'fix themselves'. And of course no fault found when at the avionics organisation...)
tdbristol is offline  
Old 1st Jun 2009, 15:09
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I have a C182T -2008 model and have had 2 AHRS failures in flight...one in IMC !(Good practice though on standby's)! At first I thought there were spurious heading problems and then eventually the big red X appeared. This IS a known problem with Garmin 1000 ... AVwebFlash Complete Issue


Have a look at that link and if you need anything else let me know.

Easlily rectified by an approved centre by changing the AHRS unit which takes longer to do the paperwork than the change itself. Make sure you have the G1000 system CD as they will need to re-install the software to the correct configuration from your aircraft.
nav3 is offline  
Old 1st Jun 2009, 17:41
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Join Date: Feb 2005
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The first time I had that problem, on a DA40, it was fixed by replacing the right hand aileron to eliminate its steel counterbalance, and moving the magnetometer further out in the wing (see RSBD4-052/3 here). However, it's started again, so this time I'm having the wiring to the magnetometer checked. Of course, it's behaved perfectly since I booked it in, but I'll let you know if they find anything.
soay is offline  
Old 2nd Jun 2009, 08:55
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Join Date: Jun 2006
Location: Maders UK
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I had a similar problem with my G1000 equiped aircraft 4 years ago. Funnily enough I only lost the heading/CDI at night (when I most needed it).
Turned out there was some kind of short between the NAV light wiring and the magnetometer/AHRS - hence it only happening at night.

The aircraft manufacturer produced an SB which rectified the problem.

Pain in the butt was I had to pay for the work! (parts were free)
This is the downside of buying an aircraft with what was (at that time) breakthrough technology - you become a test pilot and help them iron out the defects in the system.

SB
scooter boy is offline  
Old 15th Nov 2012, 01:34
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Join Date: Nov 2012
Location: Sydney
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Hello Soay,
I am having a similar problem in a DA40 at the moment. i have replaced the GMU44, GRS77 and the config module. I am contemplating about relocating the GMU44. How did you end up going with your fault?
Any assistance will be greatly appreciated.
borgie is offline  
Old 16th Nov 2012, 00:06
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Join Date: Sep 2006
Location: UK
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I had it in a DA40 and it turned out to be bent pins connecting the loom to one of the boxes that you mention.

I'm sorry that I can't remember which, but ask the avionics chaps to check the loom for chafing and to check all the pins.

It was an intermittent problem and often impossible to reproduce on the ground. I took a picture of it at FL100 with a thumbs down...
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Old 16th Nov 2012, 08:00
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What aircraft?

The da40 problems mentioned hear i have experienced or heard of; they can take some fault finding so expect the red cross not to always go away after the first trip to the engineers in my experience.
Fuji Abound is offline  
Old 16th Nov 2012, 08:20
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Join Date: Feb 2005
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Originally Posted by borgie
Hello Soay, I am having a similar problem in a DA40 at the moment. i have replaced the GMU44, GRS77 and the config module. I am contemplating about relocating the GMU44. How did you end up going with your fault? Any assistance will be greatly appreciated.
Hello borgie, my magnetometer has behaved itself since I made that post in 2009. Diamond UK informed me that relocating the GMU44 was not a difficult job, so I recommend you go for it. It's equally important to replace the right hand aileron, if it has a steel counterbalance.
soay is offline  
Old 24th Mar 2013, 16:06
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Join Date: Dec 2011
Location: Canada
Age: 34
Posts: 6
Heading Problem

Hello Scooter Boy

We are having the same problem with the Heading Failure. We called the factory and they told us they do not have any SB out. Can you PLEASE help us out and tell us where you got the info or what you did?
Can you please email me!!!

Riaz

1 868 790 5277

[email protected]
diver-driver is offline  
Old 24th Mar 2013, 21:59
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Join Date: Oct 2006
Location: Bristol
Posts: 117
Hdg failure - wiring issue

After loads of time try ing to debug, turned out to be a simple set of bad crimps. Suggest you get this checked out first - as an example, with the problem I had [which had been looked at during two weeks by 4 avionics shops including the Dimaond factory in Canada], in the end IAE at Cranfield had it sorted in less than an hour (where others had spent days changing AHRS, magnetometer etc.) as IAE started at the 'simple' level of just checking the wiring properly first.

It is hard to do as it involves contortions to get into the various places in the wiring loom (and there are 4 connections between the AHRS in the rear avionics rack and the magnetometer in the wing) so lots of avionics shops seem to feel it is easier simply to swap units out in the rear avionics rack rather than properly trying the basics of checking reliable continuity at the connectors and pulling on the wiring into the connectors to see if the wires are secure.
tdbristol is offline  
Old 24th Sep 2017, 18:59
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Join Date: Sep 2017
Location: Houston
Posts: 1
Intermittent problem with Garmin G1000 heading

Originally Posted by nav3 View Post
I have a C182T -2008 model and have had 2 AHRS failures in flight...one in IMC !(Good practice though on standby's)! At first I thought there were spurious heading problems and then eventually the big red X appeared. This IS a known problem with Garmin 1000 ... AVwebFlash Complete Issue


Have a look at that link and if you need anything else let me know.

Easlily rectified by an approved centre by changing the AHRS unit which takes longer to do the paperwork than the change itself. Make sure you have the G1000 system CD as they will need to re-install the software to the correct configuration from your aircraft.
I have a Cessna 206T with G1000. The heading would intermittently fail with X over it during flight. Is there anyway I can test out the AHRS on my plane to make sure it is the problem before replacing it? Thanks.
bill_c_27 is offline  
Old 7th Jul 2020, 06:17
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Join Date: Jul 2020
Location: California
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I have a Cessna 206T with G1000 that has the same issue. Loosing Heading in the PFD for 2-5 min during flight (big red X for HDG and no compass rose) at random times during the flight. Ususally lasts less than 5 min. Exchanged the AHRS unit and that didn't fix the issue. Any tips and suggestions greatly appreciated.
Tom Siegel is offline  
Old 13th Jan 2021, 13:18
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Join Date: Jan 2021
Location: GA
Posts: 1
Originally Posted by Tom Siegel View Post
I have a Cessna 206T with G1000 that has the same issue. Loosing Heading in the PFD for 2-5 min during flight (big red X for HDG and no compass rose) at random times during the flight. Ususally lasts less than 5 min. Exchanged the AHRS unit and that didn't fix the issue. Any tips and suggestions greatly appreciated.
Have you had any luck with resolving this issue? I am having same problem with my 2011 T206. When it happens the status of the GDL 90 goes to a red x on status but I am told my plane doesn't have a GDL 90. Any help would be appreciated.
asb0774 is offline  

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