Cessna TURBO CENTURION T210M 1978 Pilot Operating Handbook page 340

,.,...a.SNA
400 AUTOPILOT
~ TYPE AF-420A)
PILOT'S OPERA TING HANDBOOK
SUPPLEMENT
4
14. HEADING SELECTOR KNOB (HDG) - When pushed in, the heading bug (11)
may be positioned to the desired magnetic heading by rotating the HDG selector
knob. Also used to select VOR course when the autopilot is installed with
Nav/Com radios without course datum.
15. GYRO ADJUSTMENT KNOB (PUSH) - When pushed in, allows the pilot to
manually rotate the gyro compass card (13) to correspond with the magnetic
heading indicated by the compass. The unslaved gyro's (10) compass card (13)
must be manually reset periodically to compensate for precessional errors in the
gyro. The slaved directional gyro's (16) compass card (13) will automatically
realign itself due to the slaving features . However, the slaved DG may be
manually reset at any time in order to accelerate precession adjustment.
16. OPTIONAL SLAVED DIRECTIONAL GYRO - When properly set to agree with
the magnetic compass, the slaved DG will provide a magnetically stabilized
visual indication of aircraft heading and also provides electrical heading infor-
mation to the autopilot. The slaved DG eliminates the need to manua lly compen-
sate for precessional errors in the gyro.
17. GYRO SLAVING INDICATOR - Displays visual indication of heading indicator
and flux detector synchronization. When slaving needle is aligned with the DG 45°
right index, it shows that the heading indicator agrees with the aircraft m agnetic
heading. Off-center pointer deflections show the direction of heading indicator
error relative to aircraft magnetic heading. The gyro adjustment knob (15) may be
used at any time to more rapidly accomplish synchronization of the h eading
indicator reading with magnetic heading as indicated by the sla ving indica tor.
18. HEA DING SELECTOR KNOB (PUSH/
t.) -
When pushed in the he a ding bug (11)
may be positioned to the desired magnetic heading by rotating the PUSH/
t.
selector knob. Also used to select VOR course when an autopilot is insta lled with
Nav/Com radios.
19. SLAVING OFF WARNING FLAG - When out of view, indicates presence of
slaving voltage. When in view, indicates absent or low slaving voltage.
Figure 1. Cessna 400 Autopilot (Type AF-420A) (Sheet 3 of 3)