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AHRS Reboots (was Heads up - AFS 4500 potential in flight re

 
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Ron.McGann(at)ausawd.com
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PostPosted: Wed Apr 14, 2010 2:15 pm    Post subject: AHRS Reboots (was Heads up - AFS 4500 potential in flight re Reply with quote
There is nothing more disconcerting than an inflight reboot of your AHRS. I have a 3 screen GRT system with Com1 antenna on the belly and Com 2 behind the cabin top aft fuse intersection. My AHRS is located on a tray above and aft the battery box (‘standard location’), but within two feet of the com2 antenna. Com 1 is primary, com 2 is backup. I had a minor problem with the pax headset jacks that caused an intermittent open mic problem. When I attempted to correct the problem by selecting com 2, the open mic persisted, com 2 transmitted – the com 2 antenna being too close to the AHRS caused it to reboot. Having your PFD/MFD screens go blank at 3000’ aint pretty – but a great opportunity to use those backups (ASI, ALT) thought a good idea during panel design.

Fixed the open mic problem and found and fixed a dodgy BNC connector on the com2 antenna (RF leak). But only use com 2 for receive (tx still causes the AHRS to drift), pending relocation of the AHRS away from the antenna during the annual (this weekend!!)

Lessons learned:
  1. put the magnetometer in the wingtip.
  2. don’t have any tx antennas within 3’ of the AHRS
  3. don’t route any AHRS (or high sensitivity) electrical wiring in the same loom as a tx cable (including RG400)


Cheers
Ron
VH-XRM flying in Oz

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Jim Combs
Sent: Wednesday, 14 April 2010 8:45 PM
To: rv10-list(at)matronics.com
Subject: Heads up - AFS 4500 potential in flight reboot issue


Just a heads up for AFS 4500 users.

We have just recently installed a 4500 in addition to the 3500 and have discovered a potential in flight surprise. While dialing in the airport identifier for Georgetown Ky (27K) the 4500 will reboot while entering the airport identifier at the MAP / Direct to menu of the 4500. It reboots on the third letter. I am not sure if any other airport identifiers are triggers for the reboot.

If you enter the airport identifier at the 430W or on the 3500 there are no issues. Since we are using the 430W for the approaches anyway, there is a work around.

I talked to AFS about the problem and they said it was a known problem.  They currently don't have a planned software release to fix it. This problem exists using the latests firmware and map data release.

I found this while on the ground. I was glad I was not airborne. 

Thanks, Jim Combs

N312F - Flying
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jump2(at)sbcglobal.net
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PostPosted: Wed Apr 14, 2010 5:18 pm    Post subject: AHRS Reboots (was Heads up - AFS 4500 potential in flight re Reply with quote
You should have it right at rotation and both blank out, Thanks OP
Patrick Thyssen

--- On Wed, 4/14/10, McGann, Ron <Ron.McGann(at)ausawd.com> wrote:
Quote:

From: McGann, Ron <Ron.McGann(at)ausawd.com>
Subject: RV10-List: AHRS Reboots (was Heads up - AFS 4500 potential in flight reboot issue)
To: "rv10-list(at)matronics.com" <rv10-list(at)matronics.com>
Date: Wednesday, April 14, 2010, 5:13 PM


There is nothing more disconcerting than an inflight reboot of your AHRS. I have a 3 screen GRT system with Com1 antenna on the belly and Com 2 behind the cabin top aft fuse intersection.  My AHRS is located on a tray above and aft the battery box (‘standard location’), but within two feet of the com2 antenna. Com 1 is primary, com 2 is backup. I had a minor problem with the pax headset jacks that caused an intermittent open mic problem. When I attempted to correct the problem by selecting com 2, the open mic persisted, com 2 transmitted – the com 2 antenna being too close to the AHRS caused it to reboot. Having your PFD/MFD screens go blank at 3000’ aint pretty – but a great opportunity to use those backups (ASI, ALT) thought a good idea during panel design.

Fixed the open mic problem and found and fixed a dodgy BNC connector on the com2 antenna (RF leak). But only use com 2 for receive (tx still causes the AHRS to drift), pending relocation of the AHRS away from the antenna during the annual (this weekend!!)
 
Lessons learned:
  1. put the magnetometer in the wingtip.
  2. don’t have any tx antennas within 3’ of the AHRS
  3. don’t route any AHRS (or high sensitivity) electrical wiring in the same loom as a tx cable (including RG400)


Cheers
Ron
VH-XRM flying in Oz

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Jim Combs
Sent: Wednesday, 14 April 2010 8:45 PM
To: rv10-list(at)matronics.com
Subject: Heads up - AFS 4500 potential in flight reboot issue


Just a heads up for AFS 4500 users.

We have just recently installed a 4500 in addition to the 3500 and have discovered a potential in flight surprise. While dialing in the airport identifier for Georgetown Ky (27K) the 4500 will reboot while entering the airport identifier at the MAP / Direct to menu of the 4500. It reboots on the third letter. I am not sure if any other airport identifiers are triggers for the reboot.

If you enter the airport identifier at the 430W or on the 3500 there are no issues.  Since we are using the 430W for the approaches anyway, there is a work around.

I talked to AFS about the problem and they said it was a known problem. They currently don't have a planned software release to fix it. This problem exists using the latests firmware and map data release.

I found this while on the ground.  I was glad I was not airborne.

Thanks, Jim Combs

N312F - Flying
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speckter(at)comcast.net
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PostPosted: Thu Apr 15, 2010 1:57 pm    Post subject: AHRS Reboots (was Heads up - AFS 4500 potential in flight re Reply with quote
That same thing happened to me with my OP on my first flight. Both screens went black. Gives new meaning to “fly the plane”. Needless to say, I don’t have OP any longer.

Gary Specketer


From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Patrick Thyssen
Sent: Wednesday, April 14, 2010 8:15 PM
To: rv10-list(at)matronics.com
Subject: Re: AHRS Reboots (was Heads up - AFS 4500 potential in flight reboot issue)


You should have it right at rotation and both blank out, Thanks OP
Patrick Thyssen

--- On Wed, 4/14/10, McGann, Ron <Ron.McGann(at)ausawd.com> wrote:

From: McGann, Ron <Ron.McGann(at)ausawd.com>
Subject: AHRS Reboots (was Heads up - AFS 4500 potential in flight reboot issue)
To: "rv10-list(at)matronics.com" <rv10-list(at)matronics.com>
Date: Wednesday, April 14, 2010, 5:13 PM
There is nothing more disconcerting than an inflight reboot of your AHRS. I have a 3 screen GRT system with Com1 antenna on the belly and Com 2 behind the cabin top aft fuse intersection. My AHRS is located on a tray above and aft the battery box (‘standard location’), but within two feet of the com2 antenna. Com 1 is primary, com 2 is backup. I had a minor problem with the pax headset jacks that caused an intermittent open mic problem. When I attempted to correct the problem by selecting com 2, the open mic persisted, com 2 transmitted – the com 2 antenna being too close to the AHRS caused it to reboot. Having your PFD/MFD screens go blank at 3000’ aint pretty – but a great opportunity to use those backups (ASI, ALT) thought a good idea during panel design.

Fixed the open mic problem and found and fixed a dodgy BNC connector on the com2 antenna (RF leak). But only use com 2 for receive (tx still causes the AHRS to drift), pending relocation of the AHRS away from the antenna during the annual (this weekend!!)

Lessons learned:
  1. put the magnetometer in the wingtip.
  2. don’t have any tx antennas within 3’ of the AHRS
  3. don’t route any AHRS (or high sensitivity) electrical wiring in the same loom as a tx cable (including RG400)


Cheers
Ron
VH-XRM flying in Oz

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Jim Combs
Sent: Wednesday, 14 April 2010 8:45 PM
To: rv10-list(at)matronics.com
Subject: Heads up - AFS 4500 potential in flight reboot issue


Just a heads up for AFS 4500 users.

We have just recently installed a 4500 in addition to the 3500 and have discovered a potential in flight surprise. While dialing in the airport identifier for Georgetown Ky (27K) the 4500 will reboot while entering the airport identifier at the MAP / Direct to menu of the 4500. It reboots on the third letter. I am not sure if any other airport identifiers are triggers for the reboot.

If you enter the airport identifier at the 430W or on the 3500 there are no issues. Since we are using the 430W for the approaches anyway, there is a work around.

I talked to AFS about the problem and they said it was a known problem. They currently don't have a planned software release to fix it. This problem exists using the latests firmware and map data release.

I found this while on the ground. I was glad I was not airborne.

Thanks, Jim Combs

N312F - Flying
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