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.

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.