Trio Avionics Pro Pilot - Manual (Page 36)

Trio Pro Pilot Manual 3.8
36
In normal flight, unless remarkable barometric changes have
been experienced, the inactive ALT SEL display should also
agree with the current altimeter indication.
Press the V MODE button to return to the active screen.
Note: The mechanical aircraft altimeter is subject to small errors at different altitudes and should
calibrated according to FAA guidelines. The Pro Pilot contains an accurate model of the
atmosphere but may exhibit small errors attributed to normal manufacturing tolerances of the
precision sensors. Such accumulated errors between the two systems will typically be less than
1%. During rapid climbs and descents it may also be observed that the mechanical altimeter
“lags” the Pro Pilot altimeter BARO SET due to the faster response of the solid state sensors.
Entering a Target Altitude
To enter a target altitude, press the V MODE button to toggle to the ALT SEL screen
and rotate the encoder knob to select the desired altitude.
Let’s assume that we wish to climb to 7,500 feet. Rotating the encoder knob will increment the value by
100 ft. per click. Pressing and rotating the knob will increment the value by 1,000 ft. per click.
When the knob is rotated to enter the altitude, the ALT SEL LED will illuminate and the screen will show
the selected altitude. Once the proper altitude is entered, press the encoder knob to activate the climb to
altitude.
NOTE: If a climb/descent rate has previously been set in the SET VS screen, the climb/descent to
altitude will be at the rate that was entered. If no vertical rate was entered the default rate
(specified in the CONFIGURATION menu) will be automatically used.
The display screen will briefly show the BARO SET screen so the pilot can check the Pro Pilot altimeter
against the aircraft altimeter. If the autopilot altimeter does not agree with the aircraft primary altimeter,
adjust it to agree by rotating the encoder knob. This display automatically times out 5 seconds after a
change is made. Once the timeout occurs (or the encoder switch is pressed again) the climb will begin
and the display screen will show the default climb or descent rate, alternating with the destination
altitude.
NOTE:
During the climb, BOTH the AS/VS LED and the ALT SEL LED will flash unless otherwise
configured. This informs the pilot of the active modes, even if the pilot has pressed the H MODE
button to view only horizontal navigation information on the screen.
Once at the destination altitude of 7,500 feet, the system will enter the ALT HOLD mode and the aircraft
will level off and hold that altitude.
 To cancel the pre-selected altitude (but not the vertical rate), press the V MODE button until the
display shows the ALT SEL screen and then press and hold the encoder knob for 3 seconds.
The ALT SEL LED will turn off and the destination altitude will be canceled, but the climb or descent will
continue at the rate selected. The AS/VS LED will continue to flash.
 To cancel both the target altitude and the vertical rate, press and hold the V MODE button for 3
seconds.
Both LEDs will turn off and the green ALT HLD LED will illuminate as the aircraft maintains that altitude.