In a message dated 12/1/99 12:49:54 PM Mountain Standard Time,
2thman@olympus.net writes:

<< I need to know where it gets:
     a. altitude
     b. airspeed
     c. barometric pressure
     d. vertical speed >>

All these come from the EAU (engine/airdata unit) connected to your
pitot-static system.

<< If it gets most of these from the AHRS, can this data be used by the
 autopilot?  Can conventional instruments be rigged to provide backup for

 autopilot and EFIS in case the AHRS fails? >>

The AHRS is used for attitude and heading only.

<< I will be using an S-tec 55 autopilot with altitude preselect.  Can I

 the same input data as the EFIS to inform the autopilot of the data it
 needs?  Or will I need to use conventional instruments for the S-tec? >>

The EFIS will provide navigation information to the 55.  The AP uses it's

gyros for stabilization and it's own pressure sensors for altitude

 We are in the process of installing the same autopilot in our 210.

<<  Also, I think I've seen some of your literature indicating a VFR GPS

 packaged with both the EFIS 1000 and EFIS 2000, but one of your brochures
 shows the VFR GPS as not included with the EFIS 2000.  Which is true? >>

All systems include the Garmin GPS-35 (although that wasn't originally the
case).

Gordon Pratt
Sierra Flight Systems LLC