BeechTalk - BT

Username Protected · **Posted:** 27 Oct 2025, 10:54

Username Protected wrote:

check out this airplane-

https://www.controller.com/listing/for- ... t-aircraft

duals G600s and dual 530s.

who does the STC on the G600s? and would this airplane have altitude preselect?
is that a well-worn path (G600s)?

Hi Gary,

What are they asking? Times look good - max seating configuration is nice. Panel is pretty good although it could really be cleaned up with a couple of 750s and remote xponders, audio panel, etc. My understanding is that there are 2 STCs for Garmin in a 501 - JetTech and Columbia (Blackhawk). They should send you the Traxall/SierraTrax report and that should tell you. On mine there are inspections for the JetTech STC that show up in the inspection list. I assume Columbia/Blackhawk would be the same.

For altitude preselect you need to confirm that it has a GAD-43e. That is the box that allows the G600 to talk to the Sperry Flight Director. Should be listed in the SierraTrax report.

Username Protected · **Posted:** 27 Oct 2025, 11:02

Username Protected wrote:

Hi Gary,

What are they asking? Times look good - max seating configuration is nice. Panel is pretty good although it could really be cleaned up with a couple of 750s and remote xponders, audio panel, etc. My understanding is that there are 2 STCs for Garmin in a 501 - JetTech and Columbia (Blackhawk). They should send you the Traxall/SierraTrax report and that should tell you. On mine there are inspections for the JetTech STC that show up in the inspection list. I assume Columbia/Blackhawk would be the same.

For altitude preselect you need to confirm that it has a GAD-43e. That is the box that allows the G600 to talk to the Sperry Flight Director. Should be listed in the SierraTrax report.

mid 800s I recall. maybe 830? seemed a tad on the high side.

Username Protected · **Posted:** 27 Oct 2025, 13:04

Username Protected wrote:

For altitude preselect you need to confirm that it has a GAD-43e. That is the box that allows the G600 to talk to the Sperry Flight Director.

The GAD 43e provides the attitude information to the AP, so it would be weird if they don't have it.

In my setup, Blackhawk/Columbia, GAD 43e provides the attitude information. The preselect is handled by an ADC adapter box that converts the digital air data from Garmin into analog signals the Sperry FD box uses. This replaces the Sperry ADC, but adds this adapter box.

In the JetTech STC, the Sperry ADC is retained, I think.

In any case, altitude preselect is there.

What is missing is VNAV. That will come with an AP STC from either Garmin or Genesys/STEC.

Mike C.

Username Protected · **Posted:** 27 Oct 2025, 18:47

Username Protected wrote:

For altitude preselect you need to confirm that it has a GAD-43e. That is the box that allows the G600 to talk to the Sperry Flight Director.

The GAD 43e provides the attitude information to the AP, so it would be weird if they don't have it.

In my setup, Blackhawk/Columbia, GAD 43e provides the attitude information. The preselect is handled by an ADC adapter box that converts the digital air data from Garmin into analog signals the Sperry FD box uses. This replaces the Sperry ADC, but adds this adapter box.

In the JetTech STC, the Sperry ADC is retained, I think.

In any case, altitude preselect is there.

What is missing is VNAV. That will come with an AP STC from either Garmin or Genesys/STEC.

Mike C.

Username Protected · **Posted:** 27 Oct 2025, 20:54

Username Protected wrote:

VNAV is working with the Jet Tech, I've seen it with my own eyes.

Curious how that works.

Quote:

The Columbia requires a Skylight 602 box that no longer exists.

Blackhawk has another method using an IS&S box now.

Quote:

You have a very big problem if it breaks.

I've fixed a number of them and helped people out.

Quote:

The Jettech reinstalls the removed original Sperry AZ-241.

Clunky.

Quote:

There's a playing card size magic box in the works to replace that AZ-241.

That wouldn't be hard technically.

The real solution is a digital AP and ditch as the interface box crap. It will save at least 100 lbs more and be vastly more reliable and effective. That is what I am waiting for.

Mike C.

Citation 501sp