4
3700 Osuna Road NE
Suite 711
Albuquerque, NM 87109
www.sandia.aero
1.2.1
Functions
The SAI 340 performs the following functions:
Display of Indicated Airspeed (Knots or Mph)
Display of Barometric Altitude (Feet)
Display of Roll & Pitch (Fixed Pointer Format, Degrees)
Display of Slip Indication (Degrees)
Display of Vertical Speed Indication (feet per minute)
Pilot Entered Baro Correction (mb or inHg – Configurable Default Value)
Automatic and Manual Backlight Control (%)
Display of Battery Charge Status (% Remaining)
Display of V-Speed Limitations (Colored Bands)
Altitude Bug (Pilot Adjustable)
Various parameters can be configured by the installer (not pilot accessible):
Configuration of Roll & Tilt Offsets
Configuration of Airspeed and Altitude Trim
Configuration of Airspeed Units
Configuration of V-Speeds
Configuration of Baro Units
Configuration of Baro Default Value
Configuration of Battery Type
IVSI Filter Lag
1.2.2
System Interfaces
Airspeed and altitude are derived from internal pressure sensors that are connected to the
aircraft’s pitot and static lines. Airspeed is determined by the pressure difference between the
pitot and static ports, while altitude is determined by the pressure on the static port. Altitude is
barometrically corrected by the pilot entered baro value prior to being displayed.
Attitude is aided by airspeed to provide better pitch performance during takeoffs and in-flight
accelerations and decelerations. TSO performance levels are maintained with or without this
additional aiding.
Aircraft power is the only electrical interface present. No communication or data interfaces are
provided to other avionic systems in the aircraft.
