Can't get the CDI to work.

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caleb1
Senior Airman
Posts: 215
Joined: 15 Dec 2016, 18:44

Can't get the CDI to work.

Post by caleb1 »

I have the A2A Comanche configured with the GTN 750, and I cant seem to get the CDI to work.
It doesnt work no matter how the CDI option is set on the GTN 750, whether GPS or VLOC.
I had a RNAV/GPS approach dialed in the GTN, and the CDI set to GPS, and the CDI just sits seemingly disabled. (see screenshot)

Does anyone know if I am doing something wrong or skipping a step?
Thanks.

Image
Caleb Byers

A2A Hanger: C182, C172, PA-28, PA-24, J3

PC: Intel Core i7 6700 @ 3.4 GHz to 4.0 GHz, 24GB RAM, GTX 745 with 4GB VRAM, 2TB SSHD, Win 10 Home x64.

Simulators: P3D v3.4, P3D v4.5, FSX:SE

Real Hanger at FD08: 1956 C172, 1964 PA-24 400

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Nick - A2A
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Joined: 06 Jun 2014, 13:06
Location: UK

Re: Can't get the CDI to work.

Post by Nick - A2A »

Hello Caleb,

The Comanche supports just the one GTN 750, so the CDI on the NAV2 gauge shown in your screenshot will be driven by the default NAV2 radio. The GTN 750 you've installed (NAV1) should be driving the CDI on the Century NSD-360A HSI which is directly below the attitude indicator. (The edge of it is just visible at bottom left of your picture.) You can find the manual for this instrument here.

Thanks,
Nick
A2A Simulations Inc.

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caleb1
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Posts: 215
Joined: 15 Dec 2016, 18:44

Re: Can't get the CDI to work.

Post by caleb1 »

Thanks for the reply nick.
This makes sense, I did see the other instruments moving with the gtn.
But my next question is, is there a way to get vertical guidance from the gtn? Like in the case of a GPS instrument approach.
It seems as if the two instruments mentioned that do work with the gtn dont have vertical guidance, unless I am missing something.
Is the only way to get vertical guidence is by having a ILS tuned into NAV2?

Thanks
Caleb Byers

A2A Hanger: C182, C172, PA-28, PA-24, J3

PC: Intel Core i7 6700 @ 3.4 GHz to 4.0 GHz, 24GB RAM, GTX 745 with 4GB VRAM, 2TB SSHD, Win 10 Home x64.

Simulators: P3D v3.4, P3D v4.5, FSX:SE

Real Hanger at FD08: 1956 C172, 1964 PA-24 400

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Nick - A2A
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Posts: 13728
Joined: 06 Jun 2014, 13:06
Location: UK

Re: Can't get the CDI to work.

Post by Nick - A2A »

Yes, it's possible to receive vertical guidance via the HSI on NAV1 Caleb, the glideslope pointer is on the left side of the instrument. If you're using a GPS approach rather than an ILS approach, bear in mind that you'll need to make sure it's something like an LPV approach which includes vertical guidance; not all GPS approaches do.

Your best bet is probably to give us a specific example of an approach you're trying to use.

Thanks,
Nick
A2A Simulations Inc.

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caleb1
Senior Airman
Posts: 215
Joined: 15 Dec 2016, 18:44

Re: Can't get the CDI to work.

Post by caleb1 »

Ok I see now. I guess I just wasn't familiar with the HSI so didn't know what I was looking at.
And yes, I will make sure it is an LPV approach with vertical guidance.

Thanks for your help.
Caleb Byers

A2A Hanger: C182, C172, PA-28, PA-24, J3

PC: Intel Core i7 6700 @ 3.4 GHz to 4.0 GHz, 24GB RAM, GTX 745 with 4GB VRAM, 2TB SSHD, Win 10 Home x64.

Simulators: P3D v3.4, P3D v4.5, FSX:SE

Real Hanger at FD08: 1956 C172, 1964 PA-24 400

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Nick - A2A
A2A Captain
Posts: 13728
Joined: 06 Jun 2014, 13:06
Location: UK

Re: Can't get the CDI to work.

Post by Nick - A2A »

You're welcome Caleb.

Thanks,
Nick
A2A Simulations Inc.

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