VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 8 of 16
IN-FLIGHT CONFIGURATION
When the aircraft is taxiing, the FLT lamp should be slowly flashing, indicating that the M-PWR-2A device
is receiving proper data from the EFIS. The FLT lamp flashing will stop when above approximately 20
knots indicated airspeed.
To set the airspeed threshold for speed scheduling, perform the following procedure:
1. With the autopilot turned off, in cruise flight at the desired threshold speed with the EFIS properly
configured, depress the FIX push-button for several seconds until the FLT lamp illuminates, then
release the push-button. This will permanently store the airspeed threshold value. This setting
procedure may be repeated as necessary.
For speeds above the airspeed threshold, the trim motors will operate at the speeds set in Ground
Configuration using the A+ and B+ potentiometers. Below this threshold, the trim motors will operate
at the speeds set by the A- and B- potentiometers.
Should the EFIS fail or be shut down in flight, selection of the motor speed settings will default to the
external flaps position or airspeed switch, if installed. Otherwise, the motor speeds will use the A-
and B- settings, which are normally the fastest speed of operation.
2. M-PWR-2AT and Dynon SkyView only: With the aircraft near neutral trim and the autopilot turned
on, observe the behavior of the aircraft. If the trim controller was installed correctly, every several
seconds the aircraft will automatically adjust pitch and roll trim as required to maintain neutral trim
and the FLT lamp will flash as the trim motors run. If the controller was not installed correctly, the
aircraft trim will diverge from a neutral trim state and the autopilot must be turned off until the
wiring is corrected or trim controller tuning is performed.
If the aircraft cannot converge to a smooth neutral trim setting, adjust the A+ and B+ potentiometers
on the trim controller anti-clockwise. These are the cruise flight pitch and roll trim speed
adjustments, respectively. Conversely, if it takes a long time to converge to a neutral trim setting, try
turning the potentiometers clockwise. This may take several tries to get the best setting.
Note that if manual trim operation is performed with the autopilot engaged, auto-trim functions will
turn off for several seconds. This is a safety feature to allow manual override of trim when the
autopilot is engaged.
Auto-trim functions do not operate with the Garmin G3X system.
