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20 Jan 2018, 20:49 [ UTC - 5; DST ]


Greenwich AeroGroup



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 Post subject: Re: Garmin GAD 29B
PostPosted: 05 Nov 2017, 23:06 
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I was excited to see Cessna 300A in the install manual, but on further inspection, this is only the 300A IFCS (and 400A IFCS) and not the single axis 300A nor the 2 axis 400A.

Maybe another time?


I have a 400a without IFCS and a Garmin stack and a G5. So disappointed.


If I were you I would take a look at the latest install manual. It says 400A is compatible.
I was like you, disappointed that previous versions of the install manual had said IFCS models. It didn’t make sense to me since the 300 and 400 and the “A” models are all 10 volts AC. I was pleased when version 9, page 126 of that manual cleared that roadblock up. Once the back orders clear up I’m installing 2 of these, to replace my HSI and I’m putting the G5 Attitude indicator above the G5 HSI and the vacuum Attitude Indicator is going to sit where the Turn indicator is sitting today.

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 Post subject: Re: Garmin GAD 29B
PostPosted: 05 Nov 2017, 23:33 
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What if I already have a GPSS switch installed? Can that be accommodated to the new HSI and GAD 29B? My Stec 50 interfaces with that and my 530W.

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 Post subject: Re: Garmin GAD 29B
PostPosted: 06 Nov 2017, 00:40 
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Username Protected wrote:
What if I already have a GPSS switch installed? Can that be accommodated to the new HSI and GAD 29B? My Stec 50 interfaces with that and my 530W.


You possibly could do that, but why? That GPSS system will be removed as it's redundant with the G5. With the G5 HSI you will make the Heading/GPSS selection right on the G5. No longer a need for that other switch.

It's probably an Stec ST-901 which will fetch a few bucks on the used equipment market.


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 Post subject: Re: Garmin GAD 29B
PostPosted: 06 Nov 2017, 01:38 
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Username Protected wrote:
What if I already have a GPSS switch installed? Can that be accommodated to the new HSI and GAD 29B? My Stec 50 interfaces with that and my 530W.


You possibly could do that, but why? That GPSS system will be removed as it's redundant with the G5. With the G5 HSI you will make the Heading/GPSS selection right on the G5. No longer a need for that other switch.

It's probably an Stec ST-901 which will fetch a few bucks on the used equipment market.


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 Post subject: Re: Garmin GAD 29B
PostPosted: 06 Nov 2017, 01:48 
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Username Protected wrote:
If I were you I would take a look at the latest install manual. It says 400A is compatible. I was like you, disappointed that previous versions of the install manual had said IFCS models. It didn’t make sense to me since the 300 and 400 and the “A” models are all 10 volts AC. I was pleased when version 9, page 126 of that manual cleared that roadblock up.
Perhaps, but if you look at page 125 (the wiring), you see that the connections are all to lettered terminals in the ARC controller. This is unique to the IFCS versions. Compare the wiring to that shown in the Aspen PFD install manual, figures 19 (-A, -B, -C) pages 181-185.


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 Post subject: Re: Garmin GAD 29B
PostPosted: 06 Nov 2017, 10:41 
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I suggest looking at Paragraph 5.12 which starts on page 121 of the R9 manual.
Table 5-1:
Quote:
This section only applies to installations using a GAD 29B data converter and an interface to one of the autopilots listed in Table 5-1. Specific configuration details are covered in the following sections.

The subject autopilot listed is the 300A, 400A, 800A. IFCS isn't mentioned till that drawing.
I'm going forward with the interface to the 400A C530A controller and CA530A Computer.
Question: Is there such a thing as a 300A IFCS?


Last edited on 06 Nov 2017, 10:53, edited 1 time in total.

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 Post subject: Re: Garmin GAD 29B
PostPosted: 06 Nov 2017, 10:51 
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Let us know how that goes. One other thing to note is that the G5 doesn't have Left/Right outputs, so it can only drive the autopilot in Heading mode, not Approach mode.


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 Post subject: Re: Garmin GAD 29B
PostPosted: 06 Nov 2017, 11:09 
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The G5 doesn't have any left right, or up down analog outputs.
It does communicate via the CAN Bus to the GAD29B and then back to the Garmin GPS/VHF navigator (GNS/GTN) via ARINC 429 which is going to generate those signals, the tuning of a localizer channel or selection of a GPS approach with vertical guidance is going to trigger the ILS mode and step up the sensitivity on the 400A.
The GAD29B is simply mimics the type of outputs the autopilot DG would have.


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 Post subject: Re: Garmin GAD 29B
PostPosted: 06 Nov 2017, 14:26 
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Ahh, right. I was getting ahead of myself, since the Aspen regenerates the CDI function. I've got a 300A, so I'll be waiting for your pirep on the 400A.


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 Post subject: Re: Garmin GAD 29B
PostPosted: 06 Nov 2017, 14:58 
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What air data is shared between devices when the GAD 29B is used? For example, if dual G5s + GAD29B + GTX345 (with OAT) + GNS530W is installed, will heading, altitude, OAT, IAS, and Baro auto-populate in the AUX page on the 530 for calculating winds and TAS?

I'm curious about this too ... it would be great to get an answer from Trek.


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 Post subject: Re: Garmin GAD 29B
PostPosted: 07 Nov 2017, 20:09 
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Username Protected wrote:
Let us know how that goes. One other thing to note is that the G5 doesn't have Left/Right outputs, so it can only drive the autopilot in Heading mode, not Approach mode.

That's very interesting.

Can we a hard yes or no from Garmin on this one?

Thanks,

John


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 Post subject: Re: Garmin GAD 29B
PostPosted: 07 Nov 2017, 21:42 
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Username Protected wrote:
Let us know how that goes. One other thing to note is that the G5 doesn't have Left/Right outputs, so it can only drive the autopilot in Heading mode, not Approach mode.


Hello Marc,

Page 23 of the Rev. 3 G5 Pilot Guide explains the GPSS (GPS roll steering) capability provided by the GAD 29B when a Garmin GPS navigator is connected.

The GPSS feature drives the HDG output to follow the lateral roll steering guidance for a GPS approach (e.g. LPV).

You just leave the autopilot in HDG mode, enable GPSS mode on the G5 HSI, and as long as GPS is the active navigation source on the HSI, roll steering guidance is provided to the autopilot via the HDG error output signal.

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 Post subject: Re: Garmin GAD 29B
PostPosted: 07 Nov 2017, 22:10 
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My avionics technician informed me that the G5 with the GAD 29B does not have the GPSS function available with an Stec-50 autopilot? Is that true? I have GPSS with my King HSI and Stec-50. He said he is going to call Garmin tomorrow.

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 Post subject: Re: Garmin GAD 29B
PostPosted: 08 Nov 2017, 00:03 
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Username Protected wrote:
My avionics technician informed me that the G5 with the GAD 29B does not have the GPSS function available with an Stec-50 autopilot? Is that true? I have GPSS with my King HSI and Stec-50. He said he is going to call Garmin tomorrow.


Hello James,
I'd be interested to know where the avionics tech is understanding this from. the G5/GAD 29B combo is the GPSS or roll steering converter for these third party autopilot interfaces and basically provides roll steering of the system with the autopilot in a heading mode. the STEC 50 system along with the other STEC systems are covered for this.

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 Post subject: Re: Garmin GAD 29B
PostPosted: 08 Nov 2017, 00:19 
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Username Protected wrote:
Let us know how that goes. One other thing to note is that the G5 doesn't have Left/Right outputs, so it can only drive the autopilot in Heading mode, not Approach mode.



Hello everyone,
apologies for the delay in getting to everyone, but I did verify this is unfotunately an error in the revision 9 G5 manual. the Cessna autopilots are misrepresented in this manual and should read as

300 Navomatic, 300A Navomatic, 400 Navomatic and 400A Navomatic are not currently supported
References to 300A, 400A & 800A should be to 300, 400 & 800 IFCS
References to 300B, 400B & 800B should be to 300B, 400B & 800B IFCS

the "A" models are currently not approved. this is being corrected as quickly as possible. my apologies for the confusion.

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