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PILOT'S OPERATING HANDBOOK
SUPPLEMENT
CESSNA 400 NA V / COM
(RT-485A) WITH CESSNA
400 RNAV (RN-478A)
SUPPLE'MENT
CESSNA 400 NAV/COM
(Type RT-485A)
WITH
CESSNA 400 AREA
NAVIGATION SYSTEM
(Type RN-478A)
SECTION 1
GENERAL
The Cessna 400 Nav/Com (Type RT-485A) Set with Cessna 400 Area
Navigation (RNAV-Type RN-478A) consists of a RT-485ANav/Com, aR-
476A DME system, a RN-478A Area Navigation Computer and a Course
Deviation Indicator with, or without, the optional Automatic Radial
Centering (ARC) feature. The RN-478A includes circuits which combine
the VOR navigation information with distance information from the R-
476A DME system to provide data for area navigation. Operating
information for the communication set and for VOR/localizer navigation
is presented in this supplement. Operating information for area naviga-
tion and for DME is presented in separate supplements. Microprocessor
frequency management provides storage for 3 preset NA V and 3 preset
COM frequencies in MEMORY. A "keep-alive" voltage prevents loss of the
preset frequencies when the NA V / COM Switch, Avionics Power Switch,
or Master Switch is turned OFF.
The RT-485A Receiver-Transmitter includes a 720-channel VHF
communication receiver-transmitter which receives and transmits sig-
nals between 118.000 MHz and 135.975 MHz in 25-kHz steps. It also includes
a 200-channel VHF navigation receiver which receives VOR and localizer
signals between 108.00 MHz and 117.95 MHz in 50-kHz steps. The
communication receiver-transmitter and the navigation receiver can be
operated simultaneously.
The VOR or localizer signal from the navigation receiver is applied to
1
of
10
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