CESSNA
MODEL 172S NAV
III
SECTION 9 - SUPPLEMENTS
SUPPLEMENT 3
EMERGENCY PROCEDURES (Continued)
• When the mode annunciator starts to flash, the
autopilot has changed to a default mode of
operation:
ROL for lateral control and/or
VS
for
vertical control. The autopilot may be engaged
in
the previous mode again as soon as the correct
navigation,
glideslope or heading signal or source is
available.
•
The
HDG
annunciation will flash for 5 seconds
on
the selection of
NAV,
APR or REV mode to tell the
pilot to set the
HDG
bug (HSI) to the desired
course.
Effects of equipment failure
on
autopilot operation:
1.
Failure of Attitude Indicator -
No
effect
on
autopilot.
2.
Failure of AHRS - The autopilot will function only
in
ROL
mode.
3.
Failure of
DC
Turn Coordinator - Autopilot will disengage or
will not engage.
4.
Failure
of
HSI
-
If
HSI
fails to function correctly, no heading
signal will
be
available, so the autopilot
HDG,
NAV, APR
and
REV
modes will not function correctly. Only ROL mode
will function correctly.
5.
Failure of the Transponder Pressure Altitude Encoder - The
Altitude Alert and Altitude Preselect functions will not oper-
ate correctly (gray code signal not available).
6.
Failure of the
No.
2 GIA
63
Integrated Avionics Unit: If the
No.
2 G lA 63 unit fails, the autopilot will function only
in
ROLmode.
7.
Failure of the GMA 1347 Audio Panel -
No
aural annunciator
(Electronic sound or tone) will be heard when the autopilot
disengages.
FAA
APPROVED
172SPHAUS-S3-00
(Continued Next Page)
U.S.
S3-21
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