Trio Avionics Pro Pilot - Manual (Page 42)

Trio Pro Pilot Manual 3.8
42
Operation Using Certified WAAS GPS Receivers
Certified panel mounted WAAS GPS receivers have proven accuracy that allows them to be used for
precision GPS approaches into airports, as well as en route navigation.
GPSS Guidance
When an approved WAAS enabled GPS receiver (such as the Garmin 400W/500W
and 650/750 series) is used, the Pro Pilot will follow the ARINC roll commands to
the extent that it will fly complete horizontal flight plans (as entered into the GPS
receiver), including procedure turns and some holding patterns.
For GPSS guidance to be active two conditions must be met:
 The
H MODE selection must be in the TRK mode to access the ARINC
signal.
 The
blue GPSS LED must be illuminated (indicating a valid ARINC 429
signal is available) and the autopilot is in the Track (TRK) mode.
When the GPSS option is installed the Pro Pilot (while in the TRK mode) will always default to the
GPSS mode when valid data is present.
GPSS LED Indicator
 In the event that the GPSS becomes inactive (i.e. on a
localizer approach) the GPSS LED extinguishes and the
Pro Pilot immediately begins to track the Aviation Data
(AVLINK or NMEA 0183) signal that it receives on the
RS-232 data input line.
 If the pilot presses the H MODE button the Pro Pilot will
enter the Course (CRS) mode, and the blue GPSS LED
will turn off. This indicates the Pro Pilot is no longer
using the ARINC signal for guidance and is now relying
on the RS232 signal for the course and intercept
functions.
Since the GPSV does not function without the GPSS, the GPSV LED will also turn off, and vertical
guidance will be controlled by the front panel of the Pro Pilot.
NOTE: When valid ARINC guidance is available and the Pro Pilot is in the Course (CRS) mode (not
using the GPSS and GPSV functions) the blue LEDs will blink briefly every two seconds to
indicate ARINC guidance is present but not being used. Putting the Pro Pilot into the Track
(TRK) mode will again activate the GPSS and GPSV.
GPSV Guidance
A certified WAAS GPS system allows vertical tracking of RNAV descents into approved airports.
This GPSV function will not be active during the en-route portion of a flight plan and becomes active only
when the WAAS GPS is configured for the approach and the final approach is initiated. At this point, the
receiver recognizes that the approach is valid and provides the proper data signal to the autopilot for
vertical navigation.