Cessna 172S Nav III Information Manual page 309

CESSNA SECTION 9 - SUPPLEMENTS
MODEL 172S NAV III SUPPLEMENT 3
GENERAL (Continued)
9. VERTICAL SPEED (UP/DN) MODE BUTTONS - The action
of these buttons depends on the vertical mode selection
when pressed. If VS mode is active (AP plus any lateral
mode) and the UP button is pressed, the autopilot will
modify the displayed VS command (FPM) in the up
direction. Single momentary cycles on either the UP or DN
button will increment the VS command by 100 FPM per
cycle. When either button is continuously held in, it will
modify the vertical speed command by 300 fpm per second.
If ALT mode is active, pressing the UP/DN buttons will
modify the captured altitude by 20 feet per cycle, or if held
continuously will command the airplane up or down at the
rate of 500 FPM, synchronizing the ALT reference to the
actual airplane altitude upon button release.
10. AUTO PILOT CIRCUIT BREAKER - A 5-amp pull-off circuit
breaker supplies 28 VDC to the KAP 140 system.
11. WARN C/B - Power to the autopilot disconnect horn and the
annunciator (PITCH TRIM).
12. AUTOPILOT DISCONNECT (A/P DISC/TRIM INT) SWITCH -
When depressed will disengage the autopilot and interrupt
manual electric trim (MET) power. An autopilot disconnect
will be annunciated by a continuous 2 second tone
accompanied by flashing "AP" annunciations on the
autopilot computer display.
13. MANUAL ELECTRIC TRIM (MET) SWITCHES - When both
switches are pressed in the same direction, the trim system
will provide pitch trim in the selected direction. Use of
manual electric trim during autopilot operation will
disengage the autopilot.
(Continued Next Page)
FAA APPROVED
172SPHAUS-S3-00 U.S. S3-11