Cessna SkyHawk SP 172S NAV III 2005 Pilot Operating Handbook page 349

SECTION 9 - SUPPLEMENTS
SUPPLEMENT 3
CESSNA
MODEL 172S NAV III
EMERGENCY PROCEDURES
(Continued)
NOTE
If the red P lamp comes on because of abnormal
acceleration of the airplane (due to turbulence), the
lamp should go off within approximately one minute
and normal operation of the autopilot will begin again.
2. A red R means that the autopilot roll axis system has been
disabled and cannot be engaged. The autopilot cannot be
engaged again.
If a flashing mode annunciation is shown on the face of the
autopilot:
1. HOG flashing - Shows a failed heading input. PUSH the
HOG button to change to ROL mode. ROL will be shown
on the face of the autopilot.
2. NAV, APR or REV flashing - Shows that the autopilot
navigation source is not working correctly (flag). The
navigation signal may have been lost or the navigation
source may have been switched at the PFD.
NOTE
NAV, APR or REV flashing can also be caused by a
failed heading input (during course capture).
3. GS flashing - Shows a failed glideslope signal or input (GS
will ARM again if a good glideslope signal comes back).
NOTE
• If the approach is continued using the localizer
only, make sure to obey the minimum descent
altitude (MDA) for the non-precision approach
procedure. Use ALT or VS mode as necessary to
control altitude.
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S3-20 U.S.
FAA APPROVED
172SPHAUS-S3-00