169. When do you place the transponder to the ALT position? Never. If the
transponder is in STBY, it automatically goes to ALT when airspeed reaches 35
knots, and it automatically returns to STBY when airspeed decreases below 35
knots.
GMC 707 Autopilot
170. Is the GMC 707 Autopilot POH required to be on the airplane during flight?
Yes, and it must be available to the pilot while in flight.
171. How can you disconnect the autopilot? Push in the Coolie Hat on the control
yoke or pull the autopilot circuit breaker on the non-essential avionics bus.
172. List and explain the autopilot pre-flight tests:
● When avionics power is turned on, all autopilot annunciators except CWS
and TRIM illuminate and then go off after 5 seconds. When the turn
coordinator reaches operating rpm, the RDY light will illuminate.
● Heading mode test: Center HDG bug under lubber line on HSI.
Momentarily press HDG button on autopilot and note that HDG
illuminates. Rotate HDG knob and note that control yoke follows
movement to the left and right.
● Vertical speed test: Press VS button and note that VS light illuminates
VS+0. Rotate the VS control knob to 500 fpm up and the control yoke
should move aft after a short delay. Rotate the VS control knob to 500 fpm
down and the control yoke should move forward after a short delay.
● Altitude hold test: Depress the ALT button. Note that ALT annunciator
comes on, VS annunciator goes out, and yoke does not move.
● Overpower test: Grasp control yoke and input left and right aileron and
nose up and nose down to overpower autopilot. Overpower action should
be smooth in each direction with no noise or jerky feel.
● Radio check: Turn on NAV 1 radio with a valid NAV signal and select
VLOC for display on the HSI. Engage NAV mode and move OBS so that
VOR deviation needle moves left or right. Note that control yoke follows
direction of needle movement.
● Autopilot disconnect test: Press the Coolie Hat switch on the control yoke.
Note that autopilot disconnects. Move control yoke to confirm that pitch
and roll control is free with no control restriction or binding. If a pilot is in
the copilot’s seat, repeat the disconnect test using the copilot’s disconnect
switch.
Cirrus SR-20 POH Summary
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