Piper ARCHER II Pilot Operating Handbook page 272

SECTION 7 — SYSTEM DESCRIPTION
AFCS OVERVIEW
G3X Outputs to Autopilot — The G3X electronic flight instrument system provides attitude, rate, and
acceleration information to ihe servos. Additionally, indicated airspeed, vertical speed, pressure altitude and
GPS information are sent to the autopilot for mode control.
The flight director provides:
e Command Bars showing pitch/roll guidance
e Vertical / lateral mode selection and processing
Optional Electric Pitch Trim — The pitch trim servo provides manual electric pitch trim capability when the
aulopilot is not engaged. The trim servo provides automalic pitch trim when the autopilot is engaged and the
airplane is in the air. Automatic trim functionality is disabled on the ground.
Airspeed and Altitude Information — The GFC 500 requires airspeed and altitude information from the G5
instrument or the G3X system.
Underspeed Protection Is inhibited when the airspeed exceeds 70 KIAS (80 MPH).