CESSNA
SECTION 9 - SUPPLEMENTS
MODEL 172S NAV III
SUPPLEMENT 3
NORMAL PROCEDURES
(Continued)
ALTITUDE HOLD
1. ALT Button - PUSH (Make sure that the ALT annunciator on
the front of the autopilot comes on). The autopilot will stay
at the set altitude.
NOTE
f
If the ALT button is pushed while the airplane is
climbing or descending, the airplane may go
through the altitude selection by approximately
10% of the vertical rate (example: 500 ft/min =
approximately 50 feet), but will quickly lock on
and correct to the target altitude.
f
In Advisory Circular AC00-24B "Thunderstorms",
the FAA recommends the use of "Pitch Attitude
Hold" for autopilot operation in severe
turbulence. The KAP 140 does not use pitch
reference, so it is recommended that the
autopilot be disengaged and the airplane flown
manually in severe turbulence.
CHANGING ALTITUDE
If the autopilot is engaged in ALT mode (Altitude Hold):
1. For small altitude changes (less than 100 feet), push the UP
or DN button momentarily to program an increase or
decrease to the altitude selection, as applicable, of 20 feet
each time the button is pushed. This lets the autopilot make
small corrections to the altitude selection.
2. For larger altitude changes, push and HOLD the UP or DN
button, as applicable, to start a 500 ft/min altitude change.
Release the button at the altitude the autopilot is to hold.
(Continued Next Page)
FAA APPROVED
172SPHAUS-S3-00
U.S. S3-31