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CESSNA 400B AUTOPILOT
(TYPE AF-550A)
PILOT'S OPERATING HANDBOOK
SUPPLEMENT
8
heading indicated by the compass. The unslaved directional gyro's (19) compass
card (22) must be manually reset periodically to compensate for precessional
.,,,..._.
errors in the gyro. The slaved directional gyro's (37) compass card (22) 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.
25.
NON-SLAVED HORIZONTAL SITUATION INDICATOR (HSI) - Provides a
pictorial presentation of aircraft deviation relative to VOR radials and localizer
beams. It also displays glide slope deviations and gives heading reference with
respect to magnetic north. The unslaved HS I's directional gyro compass card (22)
must be manually reset periodically to compensate for precessional errors in the
gyro.
26.
OMNI BEARING POINTER - Indicates selected VOR course or localizer course
on compass card (22). The selected VOR radial or localizer heading remains set on
the compass card when the compass card (22) is rotated.
27.
HEADING WARNING FLAG (HDG) - When flag is in view, heading display is
invalid due to the slaving system power being interrupted or the HSI vacuum
~
powered gyro speed being low.
28.
NAV FLAG - Flag is in view when the NA V receiver signal is inadequate.
29.
COURSE DEVIATION BAR - Bar is center portion of omni bearing pointer and
moves laterally to pictorially indicate relationship of aircraft to selected course.
It relates in degrees of angular displacement from VOR radials or localizer beam
center.
30.
COURSE DEVIATION DOTS - A course deviation bar displacement of 2 dots
represents full scale (VOR
=
±10° or LOC
=
±2½
0
)
deviation from beam centerline.
31.
TO/FROM INDICATOR FLAG - Indicates direction of VOR station relative to
,
-.
selected course.
32.
HEADING SELECTOR KNOB (PUSH/CARD SET /6) - Positions heading "bug"
on compass card (22) by rotating the CARD SET knob. Pushing in and rotating the
CARD SET knob sets the compass card. The "bug" (36) rotates with the compass
card. Also used to select VOR or !LS course when the autopilot is installed with
300 Series Radios or 400 Series Radios without course datum.
33.
COURSE SELECTOR KNOB - Positions omni bearing pointer (26) on the com-
pass card (22) by rotating the course selector knob.
34.
GLIDE SLOPE SCALE - Indicates displacement from glide slope beam center. A
glide slope deviation bar displacement of 2 dots, represents full scale (0.7°)
deviation above or below glide slope beam centerline.
35.
GLIDE SLOPE FLAG - When in view, indicates glide slope receiver signal is not
reliable.
Figure
1.
Cessna 400B Navomatic Autopilot (Type AF-550A)
(Sheet 5 of 6)
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