190-02011-11 Rev. 2
GFC 600 Autopilot Installed in Piper PA-46-310P/350P
Page 17 of 46
Section 3A – Abnormal Procedures
AUTOPILOT PRE-FLIGHT TEST FAIL
(Red LED illuminated next to AP key, AP FAIL in Message Window on GMC 605 display)
Indicates the AFCS system failed the automatic Pre-Flight test. The autopilot, yaw damper (if installed),
ESP, and electric elevator trim are inoperative. Flight Director may still function.
LOSS OF AIR DATA
(AIRDAT FAIL in Message Window on GMC 605 display)
If pressure altitude, indicated airspeed, or true airspeed is invalid or missing, AIRDAT FAIL is displayed in
the message window. This indicates that any mode dependent on air data may not be supported such
as ESP high speed, ESP low speed, OSP, USP, IAS, VS, or ALT modes.
MANUAL AUTOPILOT DISCONNECT
If necessary, the autopilot may be manually disconnected using any one of the following methods.
1. AP DISC / TRIM INT Button ................................................................................. PRESS and RELEASE
(Pilot’s control wheel)
2. AP Button (GMC 605 mode control panel) ................................................................................. PRESS
(Yaw damper remains engaged)
3. Pitch Trim Switch………………...…............................................ ACTIVATE either half of the split switch
(Yaw damper remains engaged)
4. AUTOPILOT Circuit Breaker .......................................................................................................... PULL
Summary of Contents for GFC 600
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