Cessna 172R Pilot Operating Handbook page 317

CESSNA
SECTION 9 - SUPPLEMENTS
MODEL 172R
SUPPLEMENT 7 - FAA APPROVED
Note that the emergency procedure for any malfunction is
essen-
tially the same: immediately grasp the control wheel and regain
air-
plane control while pressing and the holding the A/P
DISC switch
down.
lt is important that all portions of the autopilot system are preflight
tested
prior to each flight
in accordance with the procedures
published herein in order to assure their integrity and continued
safe
operation during flight.
A flashing mode annunciation on the face of the autopilot
is
normally an indication of mode loss.
NOTE
An exception to this is HDG annunciation which will flash for
5 seconds along
with
steady NAVARM, APRARM,
or
REVARM annunciation to remind the pilot to set the HDG
bug for course datum use.
Flashing HDG -- Indicates a failed heading.
PRESS HDG
button to terminate flashing. ROL will be displayed.
Flashing NAV, APR or REV -- Indicates a flagged navigation
source.
If no NAV source is flagged, a failed heading mode
can be the cause.
PRESS NAV, APR or REV button to
terminate flashing. ROL will be displayed.
NOTE
At the onset of mode annunciator flashing, the autopilot
has already reverted to a default mode of operation,
(i.e., ROL mode).
An immediate attempt to reengage
the lost mode may be made if the offending navigation
flag has cleared.
SECTION 4
NORMAL PROCEDURES
PREFLIGHT (PERFORM PRIOR TO EACH FLIGHT):
1. GYROS -- Allow time for the turn coordinator to come up to
speed, as evidenced by the turn coordinator flag being pulled.
Dec 2/96
S7-9
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