Loss Of Airspeed Data; Loss Of Altitude Data; Loss Of Gps Information - Piper CHEROKEE ARCHER II Pilot Operating Handbook

LOSS OF AIRSPEED DATA

(Red X through airspeed tape on the G5 display, amber AP with a red X in autopilot status box.)
If airspeed data is lost while the autopilot is tracking airspeed, the flight director will default to
pitch mode (PIT).
1. AP DISC / TRIM INT Button ........................................................................ PRESS AND RELEASE
2. Aircraft Attitude ........................................................... MAINTAIN / REGAIN AIRCRAFT CONTROL
3. Manual Elevator Trim ............................................................................................. TRIM as required
The autopilot cannot be re-engaged. The flight director is available however IAS mode cannot
be selected. Loss of airspeed will be accompanied by a red PTRIM indication on the G5 (if a
pitch trim servo is installed).

LOSS OF ALTITUDE DATA

(Red X through altitude tape on the G5 display.)
If altitude data is lost while the autopilot is tracking altitude, the autopilot will default to pitch mode
(PIT).
1. Autopilot .......................................................................................... SELECT different vertical mode

LOSS OF GPS INFORMATION

(GPS position information is lost to the autopilot.)
If GPS position data is lost while the autopilot is tracking a GPS, VOR, LOC or BC course, the
autopilot will default to roll mode (ROL).
information is lost while tracking an ILS. The autopilot uses GPS aiding in VOR, LOC and BC
modes.
1. Autopilot ................................................ SELECT different lateral and vertical mode (as necessary)
If on an instrument approach:

AP DISC / TRIM INT button ................................... PRESS, Continue the approach manually
Or

Missed Approach Procedure .......................................................... EXECUTE (as applicable)
AFMS – GFC 500 Autopilot in Piper PA-28 Series
Page 3–6
NOTE
NOTE
NOTE
NOTE
The autopilot will default to pitch mode if GPS
(to cancel disconnect tone)
190-02291-07 Rev. 4