Textron Cessna 172S Skyhawk SP, Information Manual

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CESSNA
MODEU72S
SECTiON 9-:,SUPPLEMENTS
SUPPlEMENT 15 - FAA APPROVED
NOTE
3. Flashing GS -- Indication of a tlagged glideslope.
rearm automatically if a valid GS signal'is received.)
, ! ,:;.;". .
(GS will
I
• To continue tracking the localizer, observe the
• appropriate minimums for...a nonpreclslon,
approach. (Press AL T tWice in rapid succession to: •
terminate the flashing. Control the pitch axis in
the def~ult.llS .mode.):, ,. ,.. .','
• At the onset" of 'mode annunciator flaShing, the'
I.
autopilot has already reverted.to a default mode of
operation,
i.e., ROL and or VS mode. An
immediate 'attempt to reengage to lost' mode may
be made if the offending navigation, glideslope or
comrJas~ flag has cleared ... :.
EXCEPTION
L
-L~
~,i'
The HDG annunciation will flash .for. 5 . seconds upon
selection of NAV, APR, or REV modes to remind the pilot to
set the HDG bug for use as course datum.
Effects of instrument losses upon autopilot operation:
1. Loss of the artificial horizon -- no effect on the autopilot.
_ , • - "" r
.J _ .~~:...
2. Loss of the turn coordinator .,- autopilot inoperative.
~ ~ :.~ •. ~ ...•. ~.• ~. ., ~ .•.. __ f.
3. Loss of the Directional Gyro (DG) -- The directional gyro does
not provide any system valid flag. : If the DG fails to function
properly the autopilot heading and navigation mode will not.
function correctly. Under these. conditiohS, the only usable
lateral mode is ROL.
4. Loss of Horizontal Situation Indicator (HSi) (if installed) -- If
the HSI fails to function properly the autopilot heading and
navigation mode will not function correctly. .Under these
.' conditions, the only usable lateral mode is ROL.
5. Loss of Blind Altitude Encoder -- Altitude Alerter and Altitude
Preselect function inoperative.
Revision 5
S15-19