Cessna TR182 1979 Pilot Operating Handbook page 307

PILOT'S OPERATING HANDBOOK
SUPPLEMENT
CESSNA 400 NAV/COM
(TYPE RT-485A)
8. AUTOPILOT COUPLED ANNUNCIATOR (AP/CPLD) - Illuminates amber
when a 400B or 400B IFCS autopilot is coupled to NAV VOR/LOC converter
output (non-operational with 200A, 300A, 400, 400A and 400A IFCS autopilots).
9. NAV VOLUME CONTROL (VOL) - Adjusts vo lum e of navigation receiver audio.
10. SQUELCH CONTROL - Used to adjust signal threshold necessary to activate
COM receiver audio. Clockwise rotation increases background noise (decreases
squelch action); counterclockwise rotation decreases background noise.
11. TRANSMIT ANNUNCIATOR (XMIT) - Illuminates green when transmitter
output is normal while mike is keyed.
12. COMMUNICATION RECEIVER FREQUENCY SELECTORS - Outer knob
changes COM frequency in i-MHz steps between 118 and 135 MHz; inner knob
changes COM frequency in .05 MHz steps between .025 and .975 MHz or between
.000 and .950 MHz depending on selection of C button.
13. COM OFF-VOLUME CONTROL (OFF-VOL) - Combination ON/OFF switch and
volume control; turns on Nav/Com set and controls volume of COM receiver
audio.
14. BACK-COURSE LAMP (BC) - Amber light illuminates when an autopilot with
reverse sense feature is installed and the reverse sense switch or autopilot's back-
course function is engaged and receiver is tuned to a localizer frequency;
indicates course deviation pointer is reversed.
15. COURSE INDEX - Indicates selected VOR COURSE.
16. COURSE DEVIATION POINTER - Indicates course deviation from selected
omni course or localizer centerline.
17. GLIDE SLOPE "GS" FLAG - When visible, red GS flag indicates unreliable glide
slope signal or improperly operating equipment. Flag disappears when a reliable
glide slope signal is being received.
18. GLIDE SLOPE DEVIATION POINTER - Indicates deviation from ILS glide
slope.
19. NA V/TO-FROM INDICATOR - Operates only with a usable VOR or localizer
signal. Red NAV position (Flag) indicates unusable signal. With usable VOH
signal, indicates whether selected VOR course is TO or FROM station. With
usable localizer signal, shows TO.
20. HECIPROCAL COURSE INDEX - Indicates reciprocal of selected VOR course.
21. AUTOMATIC HADIAL CENTERING (ARC) PUSH-TO/PULL-FR SELECTOR -
In center detent, functions as conventional OBS. Pushed to inner (Momentary On)
position, rotates OBS course card to center course deviation pointer with a TO
flag, then returns to conventional OBS selection. Pulled to outer detent, continu-
ously drives OBS course card to indicate bearing from VOH station, keeping
Figure 1. Cessna 400 Nav/Com (Type RT-485A), Operating Controls and
Indicators (Sheet 3 of 4)
1 October 1978
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