Dynon Avionics EFIS-D10A Pilots Users Guide - Manual (Page 68)

Autopilot Operation
ALT: ALTITUDE MODE – PITCH SERVO
When the AP is engaged in Altitude Mode, it uses the pitch servo to control the aircraft’s aircraft’s altitude. You may
adjust the altitude bug, causing the AP-controlled aircraft to climb or descend toward the new target altitude at the
average vertical speed defined during setup. In Altitude Mode, the AP’s goal in the pitch axis is to align the triangle of
the numeric altitude box with the inverted triangle of the altitude bug.
During AP-controlled altitude changes, the AP causes the aircraft to climb or descend at the target vertical speed
specified in EFIS > SETUP > AP > PITCH SERVO. When the AP is engaged and aircraft airspeed rises above the
maximum, the AP enters an airspeed hold mode, pitching the aircraft up to prevent exceeding the maximum airspeed.
When the aircraft’s altitude rises above the target ALT bug and the AP cannot pitch the aircraft down without going
above the maximum airspeed, the EFIS presents the prompt:
MAX AIRSPEED – REDUCE POWER
Likewise, when the AP is engaged and aircraft airspeed drops below the minimum, the AP enters an airspeed hold mode,
pitching the aircraft down to prevent dropping below the minimum airspeed. When the aircraft’s altitude drops below the
target ALT bug and the AP cannot pitch the aircraft up without going below the minimum airspeed, the EFIS presents
the prompt:
MIN AIRSPEED – ADD POWER
When the Autopilot is flying the aircraft in Altitude Mode, an out-of-trim indicator can
appear to the right of the AP Status Indicator. This alerts you when the pitch servo
detects excessive load on the elevator which would result in a large pitch excursion
when the AP is disengaged. The indicator instructs you in the direction to trim the nose
to produce more neutral trim. In the example at right, the indicator appears until the pilot trims the aircraft nose up until
neutral trim. During turbulence and small bumps the trim indicator may flash on and off. Do not take action based on the
trim indicator until it remains on for several seconds.
7-8 EFIS-D10A Pilot’s User Guide