What nav/comm radios will talk to the G5?

[ArrowBerry]

Hi all,

I have a 67E and we’re looking into some panel upgrades. Still fairly new to the avionics and ownership world.

This is my current panel. In the future we would like to add a second G5 and replace one of the comms with a nav/comm unit which can send the nav data to the G5 to be able to couple them for VOR and ILS purposes. I’m not going in the direction of an entirely glass panel, but ideally I’d like the GNX 375 and a nav source to be able to talk to the G5 and get rid of the current VOR which is U/S.

Also, with the addition of the second G5 does that mean that the vacuum system can be removed?

Thanks!

[ArtVandelay]

A 2nd G5 gives you a backup AI, so if you don’t need vacuum for anything else (speed brakes, etc) then you can get rid of vacuum and the mechanical AI.

A HSI G5 can talk to a gnc 255 radio.

[Guest]

You may need to keep the vacuum pump for your vacuum step if you still have it.

Clarence

[David Lloyd]

For certified aircraft, the STC limits the G5 to be connected to only one navigation device. Your 375 will work, or the 255 mentioned will work, but not both.  A switch could allow either would work, but not allowed by the STC.  An all-in-one radio such as the Garmin 650/ 750 or Avidyne 440/540 will display GPS, VOR or ILS on the G5.

I'm in somewhat the same boat: have a GNX375 and about to have G5s installed.  Right now the 375 drives an HSI and my old KX165 drives a separate indicator.  New G5s will be the same way.  If I had expected to replace the HSI with G5s, I would have installed a all-in-one radio.

[ArtVandelay]

For certified aircraft, the STC limits the G5 to be connected to only one navigation device. Your 375 will work, or the 255 mentioned will work, but not both.  A switch could allow either would work, but not allowed by the STC.  An all-in-one radio such as the Garmin 650/ 750 or Avidyne 440/540 will display GPS, VOR or ILS on the G5.
I'm in somewhat the same boat: have a GNX375 and about to have G5s installed.  Right now the 375 drives an HSI and my old KX165 drives a separate indicator.  New G5s will be the same way.  If I had expected to replace the HSI with G5s, I would have installed a all-in-one radio.

Are you sure it’s “1 device” and not limited to 1 VOR, 1 GPS....but they can be 2 devices.

[JimB]

1 hour ago, David Lloyd said:

For certified aircraft, the STC limits the G5 to be connected to only one navigation device. Your 375 will work, or the 255 mentioned will work, but not both.  A switch could allow either would work, but not allowed by the STC.  An all-in-one radio such as the Garmin 650/ 750 or Avidyne 440/540 will display GPS, VOR or ILS on the G5.

I'm in somewhat the same boat: have a GNX375 and about to have G5s installed.  Right now the 375 drives an HSI and my old KX165 drives a separate indicator.  New G5s will be the same way.  If I had expected to replace the HSI with G5s, I would have installed a all-in-one radio.

That's not really true anymore. It was that way some time ago but Garmin now allows 2 Nav sources to the G5 and you can select them. I have a GNC 255 and GNX 375 wired to GAD 29 and it is selectable between the GPS and the VOR. 

Edited December 28, 2020 by JimB

[Skates97]

4 hours ago, M20Doc said:

You may need to keep the vacuum pump for your vacuum step if you still have it.

Clarence

If you have the vacuum step you can install @takair's electric step. It's a straightforward installation.

http://flightenhancements.com/index.html

[RobertGary1]

Btw I upgraded to the gi275. A world of difference vs the g5. Not sure if the old g5 can be a legal backup for the 275. 

[ArrowBerry]

On 12/28/2020 at 7:26 AM, JimB said:

That's not really true anymore. It was that way some time ago but Garmin now allows 2 Nav sources to the G5 and you can select them. I have a GNC 255 and GNX 375 wired to GAD 29 and it is selectable between the GPS and the VOR. 

That’s the route I’m aiming for, do you mind posting a picture of your panel?

Also, does the SL30 provide a digital output that could work with the G5? Considering the cost of a new GNC255, maybe another option could be to find a used SL30? 

Edited December 30, 2020 by ArrowBerry

[Ragsf15e]

1 hour ago, ArrowBerry said:

That’s the route I’m aiming for, do you mind posting a picture of your panel?

Also, does the SL30 provide a digital output that could work with the G5? Considering the cost of a new GNC255, maybe another option could be to find a used SL30? 

I have an SL30 as #2 and it does have digital output, however I didn’t elect to connect it to my G5s as the GNS-430W I have in #1 has both gps/vhf.  So yes it’s digital, but I can’t say for certain it works as I didn’t do it.

[ZuluZulu]

On 12/28/2020 at 4:20 AM, David Lloyd said:

For certified aircraft, the STC limits the G5 to be connected to only one navigation device. Your 375 will work, or the 255 mentioned will work, but not both.  A switch could allow either would work, but not allowed by the STC.  An all-in-one radio such as the Garmin 650/ 750 or Avidyne 440/540 will display GPS, VOR or ILS on the G5.

I'm in somewhat the same boat: have a GNX375 and about to have G5s installed.  Right now the 375 drives an HSI and my old KX165 drives a separate indicator.  New G5s will be the same way.  If I had expected to replace the HSI with G5s, I would have installed a all-in-one radio.

As @JimB said, not true.  My G5s can select between GPS (GTN 750), NAV1 (GTN 750), and NAV2 (GNC 255A).

[vorlon1]

On 12/28/2020 at 3:33 PM, RobertGary1 said:

Btw I upgraded to the gi275. A world of difference vs the g5. Not sure if the old g5 can be a legal backup for the 275. 

Would be interested in reading a pirep of the process, your impressions,  etc.

[David Lloyd]

Why would I have said such a thing about the beloved G5 if not so?  Where did I come up with the idea that only one nav radio could be connected?  Yesterday I read thru much of the G5 install manual again an could not find any such limitation.  The I saw the list of changes. # 19 07/18/2019 Added dual nav interface.  Ah, there was a change an I had read an earlier manual. I'm old and forget stuff.  And make stuff up.  But not all the time.   I stand corrected.

[Ragsf15e]

On 12/28/2020 at 12:33 PM, RobertGary1 said:

Btw I upgraded to the gi275. A world of difference vs the g5. Not sure if the old g5 can be a legal backup for the 275. 

Does the Gi275 need an AI backup?  The G5 wasn’t certified the same, so it doesn’t.  You could swap out a mechanical adi, keep the TC “backup” and be legal.  That also may let you get rid of vacuum.

 

[JimB]

3 hours ago, David Lloyd said:

Why would I have said such a thing about the beloved G5 if not so?  Where did I come up with the idea that only one nav radio could be connected?  Yesterday I read thru much of the G5 install manual again an could not find any such limitation.  The I saw the list of changes. # 19 07/18/2019 Added dual nav interface.  Ah, there was a change an I had read an earlier manual. I'm old and forget stuff.  And make stuff up.  But not all the time.   I stand corrected.

No worries at all! As you said the limitation was there before for the certified version. I really wish Garmin would allow you to remove the old ASI, ALT, VSI in the dual G5 installation. You can with the GI 275. 

[JimB]

13 hours ago, ArrowBerry said:

That’s the route I’m aiming for, do you mind posting a picture of your panel?

Also, does the SL30 provide a digital output that could work with the G5? Considering the cost of a new GNC255, maybe another option could be to find a used SL30? 

I have been pretty happy with it but if I had to do it all over again there is some things I would change. 

[RobertGary1]

52 minutes ago, Ragsf15e said:

Does the Gi275 need an AI backup?  The G5 wasn’t certified the same, so it doesn’t.  You could swap out a mechanical adi, keep the TC “backup” and be legal.  That also may let you get rid of vacuum.

 

The ai can be installed as primary and you can remove your old attitude and even airspeed and altimeter. The gi275 was designed for certified aircraft. The g5 was designed for experimental and later certified. 

[Ragsf15e]

3 minutes ago, RobertGary1 said:

The ai can be installed as primary and you can remove your old attitude and even airspeed and altimeter. The gi275 was designed for certified aircraft. The g5 was designed for experimental and later certified. 

Yes, but does it need a backup ai, second gi275, or just keeping the “partial panel” instruments.  
 

Since you can remove the aspd, and alt which are part of a partial panel scan, I’m guessing you are required to have a backup attitude or second gi275 that can revert to an AI.

[RobertGary1]

7 hours ago, Ragsf15e said:

Yes, but does it need a backup ai, second gi275, or just keeping the “partial panel” instruments.  
 

If you want to fly ifr you have to have some secondary gyro. I don’t think anyone would launch into the clouds without that. Unless I’m misunderstanding. 

[Ragsf15e]

2 hours ago, RobertGary1 said:

If you want to fly ifr you have to have some secondary gyro. I don’t think anyone would launch into the clouds without that. Unless I’m misunderstanding. 

The traditional backup for the vacuum ADI was the TC along with the other “performance” instruments.  So yes, the TC is a gyro but clearly not an attitude indicator.  I understand the G5 was certified under different rules than the -275.  The G5 can however be a 1 for 1 swap with an ADI and you’re perfectly legal to fly IFR.  Probably safer than with a vac ADI.  Either way, you are only backed up the TC, Aspd, Alt, VSI and a well rehearsed PP scan.
 

My question was this, does the gi-275 need a backup ADI or do the traditional “partial panel” instruments suffice?

[jetdriven]

You can have back up instruments, or you can have a second 275 to meet the requirements.

[tmo]

20 hours ago, JimB said:

if I had to do it all over again there is some things I would change

Do tell...

[McMooney]

On 12/29/2020 at 9:01 PM, ArrowBerry said:

That’s the route I’m aiming for, do you mind posting a picture of your panel?

Also, does the SL30 provide a digital output that could work with the G5? Considering the cost of a new GNC255, maybe another option could be to find a used SL30? 

unfortunately, people are very proud of their sl30's, unless you get lucky used isn't much cheaper than a new gnc255

[JimB]

40 minutes ago, tmo said:

Do tell...

I think it would have made more sense to go with a G3X with remote units for the VHF nav/coms. Even the smaller size G3X would have been nice. Of course its all about money and going from what I had before to what I have now, I really cannot complain. It was probably the least expensive upgrade path I could have chosen.