Can 2 sources be wired into G5 w/GAD29B?

[BloodRedSkies]

I have dual G5s with a GAD29B and the GTN650 goes in to that, but not my 430w which is my number 2 it goes to a separate 106A. My question is what does it take to hook that up so I can select either GPS/NAV with the G5 HSI? 

[201Steve]

My G5 is hooked to a 650 and a 430. Can select number 1 or number 2 from the G5. It’s written in the install manual but that’s all I know to describe. 

[ArtVandelay]

I believe the first certified versions only supported 1 source, support for 2 came later.

[Jblanton]

Easy to do.  One twisted pair 22g wire.  The number 2 radio is hooked up via ARINC 429 to the GAD29B, and a couple settings changes in the 430 and G5.  You must remove the connections to the 106A to be legal.  Can't display on two indicators.

[N231BN]

8 hours ago, BloodRedSkies said:

I have dual G5s with a GAD29B and the GTN650 goes in to that, but not my 430w which is my number 2 it goes to a separate 106A. My question is what does it take to hook that up so I can select either GPS/NAV with the G5 HSI? 

Do you have an autopilot? The hangup with having two navigators connected to a GAD-29 is you can't utilize the autopilot outputs for a non-Garmin autopilot.

This is just one area where the GI-275 shines over the G5.

[BloodRedSkies]

1 hour ago, N231BN said:

Do you have an autopilot? The hangup with having two navigators connected to a GAD-29 is you can't utilize the autopilot outputs for a non-Garmin autopilot.

This is just one area where the GI-275 shines over the G5.

I do have an S-tech 30. It tracks high and low sensitivity, gpss off the 650 through the HSI. There just is no choice on the HSI screen for a gps2. 

 

By the way the our Mooney I grew up with was 231BM(25-0071). I have a 1000+ in it. 

[N231BN]

1 minute ago, BloodRedSkies said:

I do have an S-tech 30. It tracks high and low sensitivity, gpss off the 650 through the HSI. There just is no choice on the HSI screen for a gps2. 

 

By the way the our Mooney I grew up with was 231BM(25-0071). I have a 1000+ in it. 

Neat, 25-0083 here.

 

The S-TEC 30 uses the HDG error output from the G5/GAD29 so you cannot enable a second navigator input, not enough DAC's in the box to do it all I guess.

[Ragsf15e]

2 hours ago, N231BN said:

Neat, 25-0083 here.

 

The S-TEC 30 uses the HDG error output from the G5/GAD29 so you cannot enable a second navigator input, not enough DAC's in the box to do it all I guess.

I see your documentation there, so I’m not (fully) doubting, but I also think it’s allowed to connect two navs if they are both “digital”, as in a gtn or gns and an sl30 nav/com or other digital nav.  The installation manual is great Except it’s got so much information that it has sections for 1g5, 2g5s, gad29, no gad29, 1 g5 with ap, wo ap, w garmin ap, with non garmin ap, etc.  which section is that from above?

[N231BN]

I see your documentation there, so I’m not (fully) doubting, but I also think it’s allowed to connect two navs if they are both “digital”, as in a gtn or gns and an sl30 nav/com or other digital nav.  The installation manual is great Except it’s got so much information that it has sections for 1g5, 2g5s, gad29, no gad29, 1 g5 with ap, wo ap, w garmin ap, with non garmin ap, etc.  which section is that from above?

No worries, Section 2.1 "Installation Limitations."

It is interesting that they don't mention this in either the navigator connection or autopilot connection sections. I believe it is a limitation on how much the GAD 29 can handle.

[jamesm]

While I don't have GTN or GNS navigators installed.  I do have GNC255 (Nav/Com) and GNC355(GPS/Com) and wired it up that I can source GPS or VOR/LOC/ILS  using 2 G5's, it works ok. It's kind of PITA with having Old Eyes the nav source selector box on the G5 isn't that big and kind of subtle. I would be nice if Garmin would put fatter border around the Nav selector box for the selection Nav source on the G5 and also OBS Course will default to 360 when power is removed. So I only have one CDI  indicator the G5.

You probably already aware of this  but for the people that might not be aware...

I my case the GNC units are TX/RX(transmitting/Receiving) ARINC 429 and the purpose of the GAD29B is to Convert  ARINC429 Signal into CAN ( Controller Area Network)signal for the G5's.  If I recall correctly... there was a  setting I don't recall which one but it wasn't so intuitive  but I matched the  installation manual  it has worked great.

GNC units Don't speak CAN whereas the G5's speaks CAN and RS232 signal formats.

GNC navigator's speak RS232 (many different RS232 formats but you can only have one RS232 Format per port no format repeats across the other 2 ports. GNC355 has 3 ports and are commonly daisy chained for various equipment that needs GPS position (Engine monitors,LHS landing Height System, ELT, etc), sudo ARINC429 (it doesn't use the ARINC labels as far I can't tell it uses RS232 GPS position), Resolver, Syncro signals( a whole bunch of wires need think old school 70's CDI's and non digital Auto pilots) , composite signals, Ethernet not sure of the protocol, HSB bus not sure of the protocol, 1PPS I/O I think it's for precision timing.

you could in the  case of the GNC navigator have it talk to G5 via RS232 and that worked until I added the GNC355 ( my  2nd GNC navigator) with no panel space to spare for a 2nd CDI so I elected GAD29B which allows me to switch between two different nav sources. Since I wasn't allowed install or hook up the GFC500 ... I m not too sure what all signals besides CAN is being used for the GFC500 and GSA28 Servos.

GAD13 OAT (outside Air Temperature probe which I understand there couple different option on the probe which get converted to CAN used by G5 system.

GAD29B (there are few different variants of the GAD 29)  which converts ARINC429 and Resolver, Syncro signals in some case where applicable to  CAN so the G5  understands the signals being transmitted and received.

getting the correct RS232 format can be tricky  when connecting  to a non Garmin products such as Engine monitors, ELT LHS, etc etc.

for reference only and going my sketchy memory and limited understanding.

Hope this helps

James '67C

[201Steve]

11 hours ago, Jblanton said:

 You must remove the connections to the 106A to be legal.  Can't display on two indicators.

That’s the caveat I was trying to remember. I don’t understand why it would be frowned upon by the feds to be able to toggle your displays but…. I don’t understand a lot of things. 

[Pinecone]

Can it be installed with a switch to display on one or the other, but not both at the same time?

One of our CAP 182 has a 76-pack with Garmin 400.  There is a switch to select which one to display on the CDI.

[N231BN]

8 minutes ago, Pinecone said:

Can it be installed with a switch to display on one or the other, but not both at the same time?

One of our CAP 182 has a 76-pack with Garmin 400.  There is a switch to select which one to display on the CDI.

It's not approved or even recommended but still possible with a relay. I'm not sure what it would really achieve, there is the same chance of having a G5/GAD29 failure as there is a GTN failure. Not to mention the single avionics buss or master switch/relay. I would rather have the GNS separate with the GI-106A in case the G5 goes down.

IMHO, these airplanes aren't built with the redundancy of a Part-25 Jet so there isn't any reason to make the avionics more complicated than they need to be.