Textron Aviation Cessna 172S NAV III Skyhawk SP, Information Manual

Page: 339 / 490

CESSNA SECTION 9 - SUPPLEMENTS
MODEL 172S NAV III SUPPLEMENT 3
KAP 140 AUTOPILOT
U.S.
FAA APPROVED
GENERAL
(Continued)
6. Approach (APR) mode - locks on-course with greater sensitivity
than NAV mode. APR mode is used to lock on the final approach
course to the Final Approach Fix (FAF), and start the final
approach segment of the procedure. While operating on an
intercept heading or course, in either HDG or NAV mode, APR
mode is set or armed (ARM) to lock on to the final approach
course. APR mode will work for VOR, LOC and ILS approaches
using either the NAV 1 or NAV 2 VHF navigation radios with the
correct signal, the applicable radio set as the navigation source
on the HSI and the correct course (CRS) set on the HSI. APR
mode will automatically lock on the glideslope (GS) using
vertical speed mode during ILS approaches. APR supplies
vertical guidance only for ILS approaches, and then only when
established on the localizer before glideslope intercept. This
mode also works for GPS or RNAV/GPS approaches when GPS
is set as the navigation source on the HSI.
The KAP 140 autopilot gives the pilot altitude preselect and altitude
alert functions. The altitude preselect function lets the pilot set a limit or
target altitude before starting a climb or descent. The autopilot will
climb or descend, as applicable, at the preselected vertical speed and
will return to level flight at the preselected altitude. The altitude alert
function will supply an altitude alert, an electronic sound or aural tone,
at 1000 feet before the preselected altitude or when altitude changes
more than 200 feet from the altitude selection.
The KAP 140 autopilot elevator trim system supplies automatic
adjustment of elevator trim during normal autopilot operation. The
autopilot elevator trim system also supplies the pilot with a Manual
Electric Trim (MET) system when the autopilot is not engaged. The
MET system is controlled by using the DN-UP switches on the control
wheel. The elevator trim system is designed to default to a fail-safe
condition for any single trim system malfunction during flight. All trim
system malfunctions will produce warning annunciations on the face of
the KAP 140 autopilot display and on the upper right portion of the
Garmin G1000 PFD.
(Continued Next Page)
172SPHAUS-S3-01 S3-5
For
Training
Purposes
Only