Cherokee 180 with GNS 650 glide slope
Cherokee 180 with GNS 650 glide slope
I don't know whether or not I missed some documentation, but flying an ILS in the 180, I can't get the top CDI to display any vertical info when I put the GTN 650 in CDI LOC mode. I see the bottom Nav radio has the ILS freq and I get the Loc on the single needle, but the top doesn't give me the vertical deviation. Am I doing something wrong.
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Re: Cherokee 180 with GNS 650 glide slope
Afraid I'm not familiar with the GTN units, but it's worth bearing in mind that not all ILS's have a glideslope available; sometimes it's just a localiser. Which approach were you flying?
In any case, the bottom nav radio (NAV2) can't be used to fly a precision ILS approach (one with a glideslope) in the Cherokee because it's not linked to an OBI gauge with a glideslope needle. For these precision ILS approaches, you need to tune the ILS NAV frequency into NAV1 which in your case is the GTN 650.
Cheers,
Nick
In any case, the bottom nav radio (NAV2) can't be used to fly a precision ILS approach (one with a glideslope) in the Cherokee because it's not linked to an OBI gauge with a glideslope needle. For these precision ILS approaches, you need to tune the ILS NAV frequency into NAV1 which in your case is the GTN 650.
Cheers,
Nick
A2A Simulations Inc.
Re: Cherokee 180 with GNS 650 glide slope
I tried with several ILS's that I use all the time. The problem is when I set the LOC frequency in the GTN, it adjust the freq in Nav 2. and the lower indicator , works showing the LOC course. The only time the upper OBI gauge indicates anything is when I switch the GTN 650 to GPS instead of LOC, then the upper OBI indicates the correctly. It's as if the upper indicator does not work at all for LOC/GS. Maybe this is a GTN issue, but I thought that I read somewhere, that the GS doesn't work in the Cherokee 180.Nick M wrote:Afraid I'm not familiar with the GTN units, but it's worth bearing in mind that not all ILS's have a glideslope available; sometimes it's just a localiser. Which approach were you flying?
In any case, the bottom nav radio (NAV2) can't be used to fly a precision ILS approach (one with a glideslope) in the Cherokee because it's not linked to an OBI gauge with a glideslope needle. For these precision ILS approaches, you need to tune the ILS NAV frequency into NAV1 which in your case is the GTN 650.
Cheers,
Nick
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Re: Cherokee 180 with GNS 650 glide slope
As far as I'm aware, the GTN 650 config in the Cherokee should work fine with ILS glideslopes provided you've set the GTN CDI mode to VLOC as you mentioned. Maybe some GTN 650 users will be able to chime in here. It'll probably help if you post a couple of screenshots showing the issue you're describing.
Thanks,
Nick
Thanks,
Nick
A2A Simulations Inc.
Re: Cherokee 180 with GNS 650 glide slope
I think I found out the problem. I installed the default GPS in the panel, using the A2A config, and started the Cherokee, and the Nav com #1 is dead, it will not turn on and all. I guess I will have to reinstall the Cherokee.Nick M wrote:As far as I'm aware, the GTN 650 config in the Cherokee should work fine with ILS glideslopes provided you've set the GTN CDI mode to VLOC as you mentioned. Maybe some GTN 650 users will be able to chime in here. It'll probably help if you post a couple of screenshots showing the issue you're describing.
Thanks,
Nick
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Re: Cherokee 180 with GNS 650 glide slope
Sounds like something could be a little funky with the installation, but have you checked the fuse for "NAVCOM 1" just under the pitot heat switch?
Nick
Nick
A2A Simulations Inc.
Re: Cherokee 180 with GNS 650 glide slope
The sound you may here is me smacking myself in the head... I am a retired teacher of electronics, and you would think that the first thing I would look for is a blown fuse........Nick M wrote:Sounds like something could be a little funky with the installation, but have you checked the fuse for "NAVCOM 1" just under the pitot heat switch?
Nick
Thanks for your help, I really appreciate it...
Bob
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Re: Cherokee 180 with GNS 650 glide slope
Hey - you're welcome. Glad it was an easy fix with no reinstallation required. If it's any consolation, it seems the navcom 1 fuse implementation is a little dodgy when the GTN unit is installed, as rather than removing power to the entire unit, it appears to just remove its ability to tune navaids.
Nick
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Re: Cherokee 180 with GNS 650 glide slope
I found the problem. After I fixed the fuse, the top radio worked, but I was still controlling the bottom radio when I switched the Nav frequency in the GTN 650. Therefore I could not get a G/S indication because the CDI for the bottom Nav radio has no glide slope indicator. Then I decided to look on the GTN configurator, and found out that there was a setting in the config to determine which radio the GTN was controlling. It was set to Nav Com 2. So whatever frequency was set on Nav 1 when installing the GTN 650, it stayed there forever and of course the CDI never moved.I changed it to Nav Com 1 in the GTN configurator , and now everything is working perfectly.Nick M wrote:Hey - you're welcome. Glad it was an easy fix with no reinstallation required. If it's any consolation, it seems the navcom 1 fuse implementation is a little dodgy when the GTN unit is installed, as rather than removing power to the entire unit, it appears to just remove its ability to tune navaids.
Nick
Last edited by bobsk8 on 24 Jul 2016, 08:43, edited 3 times in total.
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Re: Cherokee 180 with GNS 650 glide slope
Okay - just out of interest, what happens if you try to tune the NAV1 frequency using the shift 6 'quick radios' panel rather than the GTN 650?
Nick
Nick
A2A Simulations Inc.
Re: Cherokee 180 with GNS 650 glide slope
See above solution I found.Nick M wrote:Okay - just out of interest, what happens if you try to tune the NAV1 frequency using the shift 6 'quick radios' panel rather than the GTN 650?
Nick
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Re: Cherokee 180 with GNS 650 glide slope
Aha - good to hear it's all sorted.
Nick
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A2A Simulations Inc.
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