Trio Avionics Pro Pilot - Manual (Page 13)

Trio Pro Pilot Manual 3.8
13
Chapter 3
Control and Display Overview
The control and display unit is designed to fit in a standard 3 1/8 inch instrument cutout in the instrument
panel and requires approximately a 7 inch clearance behind the instrument panel. The unit is powered
from the airframe +12V DC system. +28V DC systems are also available. All controls are located on the
front panel.
Switch Function and Operation
ON/OFF Switch
The ON/OFF switch applies aircraft power to the Pro Pilot. In the OFF position, the Pro Pilot is
disconnected from the aircraft control system. It is recommended that the Pro Pilot be turned on
immediately after engine start. Upon power up, the display presents a logo and the current Pro Pilot
firmware code version (or a customized screen) and sets several default conditions as follows:
Upon power up, the screen will display the un-calibrated field
elevation (if the aircraft is on the ground) or un-calibrated
altitude (if the aircraft is flying). The value is expressed in
feet.
The pilot must adjust this value to agree with the primary aircraft altimeter, which has been previously
adjusted to the reported barometer setting.
Once the Pro Pilot altimeter has been adjusted, pressing the encoder knob will enable the navigation
screen.
Operation
Initially, with GPS data available, the TRK (Track) mode is selected and the TRK LED is illuminated.
This mode is not fully operational until valid GPS data is available. When GPS is unavailable for seven
seconds, or after initial power up, the display will default to a flashing "NO GPS" message.
NOTE: No H MODE LEDs will illuminate until valid GPS data is available.
Without GPS input, the autopilot will still function as a wing leveler and the rotary encoder can be used to
initiate turns to the left or right or to correct airplane heading drift for straight ahead flight. Because the V
NAV function does not rely upon GPS, the altitude hold system will be unaffected.
Once GPS data is present and validated, full navigation functionality is available and the TRK LED will
illuminate.
If no flight plan or “GOTO” waypoint has been selected in the GPS receiver, a “NO FLTPLN” message
will appear and the course mode (CRS) is automatically selected (CRS LED illuminated).
All servo power is initially off on power up and the Pro Pilot is disconnected from the aircraft control
system.