Trio Avionics Pro Pilot - Manual (Page 35)

Trio Pro Pilot Manual 3.8
35
Once the climb or descent is under way, the display will show the SET VS (Vertical Speed) screen. Here,
the pilot may adjust the current climb/descent rate to a different vertical speed as conditions demand.
NOTE: A vertical rate and target altitude may be entered prior to engaging the V NAV servo: e.g. prior
to takeoff. Once these parameters have been entered, the aircraft will immediately enter a
climb when the V NAV servo is engaged.
Entering the Current Altitude
For the altitude pre-select function to be accurate, it is important that the system be set to the current
local barometric pressure. Just as the primary aircraft altimeter must be adjusted to compensate for
barometric pressure changes, the Pro Pilot also provides a means for making such adjustments. While
the primary aircraft altimeter is adjusted using a scale calibrated in “inches of mercury” (e.g., 29.92), the
Pro Pilot is adjusted to agree with the altitude shown on the corrected primary altimeter.
Barometer Elevation/Altitude Set
If the aircraft is on the ground when the Pro Pilot system is
turned on the display screen will show the BARO SET display
and indicate the assumed field elevations.
The initial barometric elevation should be set to be as close to that of the airfield elevation as possible.
Any difference will be the result of barometer changes since the system was last used. Rotating the
encoder knob will change the baro elevation in 5 foot increments, and it should be set to be as close to
the actual airfield elevation as possible, in feet. This will assure that the internal Pro Pilot system
altimeter will agree closely with the aircraft altimeter that has also been corrected to airfield elevation.
In practice, during preflight checks the pilot will set the primary aircraft altimeter using a current
barometer setting. The aircraft altimeter will then be indicating the current elevation. The Pro Pilot
BARO SET should be set to agree with the corrected primary aircraft altimeter.
If the aircraft is in flight when the Pro Pilot is first turned on, the
screen will again show the BARO SET display and indicate
the assumed altitude as shown.
If this does not agree with the baro corrected primary aircraft altimeter, rotate the encoder knob to enter
the proper altitude. The aircraft should be level (not climbing or descending) so that the aircraft altimeter
needles are not moving. The initial altitude will likely be already close to that shown by the aircraft
altimeter. Here again, any differences will be the result of barometer changes since the last time it was
set. The system is now calibrated and ready to use. Press the encoder knob to exit or wait five seconds
for this screen to time out automatically.
Once the altitude has been set, it can be accessed and changed at any time. To see the BARO SET
screen in flight, press the V MODE button repeatedly and the display will increment as follows:
ALT HLD -SET VS - ALT SEL – BARO SET
The BARO SET may then be changed by rotating the encoder
until the indicated altitude agrees with the aircraft altimeter.
The display resolution is in 20 foot increments for the BARO
SET function in this mode.