IFD540 & Stec-55x Glideslope Wiring |
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jonesronc
Newbie Joined: 31 May 2016 Status: Offline Points: 20 |
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Posted: 21 Aug 2016 at 5:31pm |
I have the above with an NSD-360A HSI installed in April; GS arms but won't couple. HSI GS indications normal. ILS & GPS with vertical guidance both don't couple. I thought at first I just didn't have the parameters just right, but after more than a dozen precision approaches I've definitely got the flying part down. It looks like the 540 has 3 GS output wires and the Stec wants 4. Has anybody had this problem or know of a likely fix? Thx.
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rolfe_tessem
Senior Member Joined: 06 Jan 2012 Location: Massachusetts Status: Offline Points: 189 |
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I had a 55x installed on my Bonanza with a 540 a few months ago by Stellar Avionics in Chester, CT. You might want to give them a call. I have a King HSI, although I can't imagine why that would make a difference. Mine works flawlessly after one initial glitch was fixed.
Edited by rolfe_tessem - 21 Aug 2016 at 10:40pm |
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wookie
Groupie Joined: 18 Feb 2015 Location: Colorado Status: Offline Points: 56 |
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Does your 55x have autotrim? BH
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BH
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rolfe_tessem
Senior Member Joined: 06 Jan 2012 Location: Massachusetts Status: Offline Points: 189 |
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Yes it does and it works perfectly! Rolfe
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wookie
Groupie Joined: 18 Feb 2015 Location: Colorado Status: Offline Points: 56 |
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Reason I ask is that there are some installations where auto trim is required
for GS coupling. Not an issue here, it's something else. BH |
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BH
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jonesronc
Newbie Joined: 31 May 2016 Status: Offline Points: 20 |
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My current aircraft doesn't have autotrim, but neither did my previous twin with a -30, and it coupled fine. Al at Avidyne tech support said go from GAMA 429 to GAMA 429 with Graphics/INT on the ARINC config page, but the aircraft couldn't hardly keep course with that. S-Tec said go with the plain ARINC 429 format. Which format are y'all using? Ron |
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rolfe_tessem
Senior Member Joined: 06 Jan 2012 Location: Massachusetts Status: Offline Points: 189 |
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I'm sure my avionics shop knows, but I haven't a clue. I'm due in there shortly for a Sandia Quattro and will ask... Rolfe |
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wookie
Groupie Joined: 18 Feb 2015 Location: Colorado Status: Offline Points: 56 |
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All the 429 affects is GPS steering.
The '30 only supports altitude hold as a vertical mode.... it does not have GS coupling FWIW. BH |
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BH
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jonesronc
Newbie Joined: 31 May 2016 Status: Offline Points: 20 |
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Regarding -30, come to think of it, you're right - I would set trim for Ground Speed/2 *100 = fpm and down I'd go; I was confusing that with a TruTrak I was flying at the time. Regarding ARINC, why did Avidyne think it was an ARINC issue when I called them? Ron |
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wookie
Groupie Joined: 18 Feb 2015 Location: Colorado Status: Offline Points: 56 |
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If the 429 isn't connecting, the symptom would be that the gpss would just wander around. There are several flavors and speeds on 429 -- I'm not conversant, sorry. bh
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BH
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jonesronc
Newbie Joined: 31 May 2016 Status: Offline Points: 20 |
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Fixed the problem; one of the high density pins on P1001 had lost its lock and was pushing in when the radio was loaded into its tray. Reset the pin and all works now. yay
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