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PILOT'S OPERATING HANDBOOK
SUPPLEMENT
CESSNA 300 NAV / COM
(RT-385A) WITH CESSNA
400 RNAV (RN-478A)
3.
NAVIGATION OPERATING FREQUENCY READOUT.
4,
ID-VOX-T SWITCH - With VOR or LOC station selected,
in
ID position, station
identifier signal is audible; in center VOX (Voice) position, identifier signal is
suppressed; in T (Momentary On) position, the VOR navigational self-test
function is selected.
5.
NAVIGATIONAL RECEIVER FRACTIONAL MEGAHERTZ FREQUENCY
SELECTOR - Selects NA V frequency
in
.05 MHz steps between .00 and .95 MHz;
simultaneously selects paired glide slope frequency and DME channel.
6.
NAV VOLUME CONTROL (VOL) - Adjusts volume of navigation receiver audio.
Clockwise rotation increases audio level.
7.
NAVIGATION RECEIVER MEGAHERTZ FREQUENCY SELECTOR - Selects
NA V frequency in 1-MHz steps between 108 and 117 MHz; simultaneously selects
paired glide slope frequency and DME channel.
8.
COMMUNICATION RECEIVER-TRANSMITTER FRACTIONAL MHz FRE-
QUENCY SELECTOR - Depending on position of the 5-0 Switch, selects COM
frequency
in
.05 MHz steps between .000 and .975 MHz. The 5-0 switch identifies the
last digit as either 5 or 0.
9.
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.
10.
COMMUNICATION
RECEIVER-TRANSMITTER
MHz
FREQUENCY
SELECTOR - Selects COM frequency in 1 MHz steps between 118 and 135 MHz.
11.
COM OFF-VOL CONTROL - Combination on/off switch and volume control;
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turns on NAV/COM Set and RNAV Computer circuits; controls volume of
communication receiver audio.
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12.
COURSE CARD - Indicates selected VOR course under course index.
13.
BACK COURSE LAMP (BC) - Amber light illuminates when an autopilot with
reverse sense feature is installed and the reverse sense switch or the autopilot's
back-course function is engaged and receiver is tuned to a localizer frequency;
indicates course deviation pointer is reversed.
14.
AREA NA V LAMP (RN) - When green light is illuminated, indicates that RNA V
operation is selected.
15.
OMNI BEARING SELECTOR (OBS) - Rotates course card (12) to select desired
bearing to or from a VOR station or to a selected RNAV waypoint.
16.
COURSE INDEX - Indicates selected VOR or RNAV course (bearing).
17.
COURSE DEVIATION POINTER - Indicates deviation from selected VOR or
RNA V course or localizer centerline.
Figure
1.
Cessna 300 Nav/Com Set, Operating Controls and Indicators
(Sheet 2 of 3)
3
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