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PILOT'S OPERATING HANDBOOK
SUPPLEMENT
CESSNA 400 NAV/COM
(RT-485A) WITH CESSNA
400 RNA V (RN-478A)
12.
COMMUNICATION RECEIVER FREQUENCY SELECTORS - Outer knob
changes COM frequency in 1-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 setting 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.
COURSE CARD - Indicates selected VOR course under course index.
15.
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.
16.
AREA NAV LAMP (RN) - When green light is illuminated, indicates that RNAV
operation is selected.
17.
OMNI BEARING SELECTOR (OBS) - Rotates course card (12) to select desired
bearing to or from a VOR station or
to
a selected RNAV
waypoint.
18.
COURSE INDEX - Indicates selected VOR or RNA V course (bearing).
19.
COURSE DEVIATION POINTER - Indicates course deviation from selected
VOR or RNAV course or localizer centerline.
20.
OFF/ TO-FROM IND I CA TOR - Operates only with VOR or localizer signal. OFF
position (flag) indicates unusable signal. With usable VOR
signal,
when OFF
position disappears, indicates whether selected course is TO or FROM station or
waypoint. With usable localizer signal, shows
TO.
~1.
RECIPROCAL COURSE INDEX -
Indicates
reciprocal of selected VOR or RNA V
course.
22.
NAV INDICATOR FLAG - When in view, red NAV position (Flag) indicates the
selected VOR or localizer signal is unusable.
23.
AUTOMATIC RADIAL CENTERING (ARC-PUSH-TO/PULL-FR) SELECTOR -
In center detent, functions as conventional
OBS.
Pushed to inner
(Momentary
On)
position, turns OBS course
card
(14) to center course deviation pointer (19) with a
TO
flag (20 or 24),
then returns
to conventional OBS
selection.
Pulled .to outer
detent,
continuously drives OBS
course
card (14) to indicate bearing from VOR
station, keeping course deviation pointer
(19) centered,
with
a
FROM flag
(20
or
24). ARC function will not operate on localizer frequencies.
NOTE
Engaging either Automatic Radial Centering (ARC) functions will
alter the airplane's course anytime the autopilot is engaged and
coupled to any frequency other than a localizer frequency.
Figure
1.
Cessna 400 Nav/Com Set, Operating Controls and Indicators
(Sheet 3 of 4)
5
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