Cessna 400 Area Navigation System (Type Rn-478A) - Cessna 182Q 1979 Pilot Operating Handbook

PILOT'S OPERATING HANDBOOK
SUPPLEMENT
SUPPLEMENT
CESSNA 400 RNAV
(TYPE RN-478A)
CESSNA 400 AREA NAVIGATION
SYSTEM ~\j
(Type RN-478A)
SECTION 1
GENERAL
The Cessna 400 Area Navigation System (Type RN-478A) consists of
an RN-478A Area NAV Computer (RNAV), a compatible VHF navigation
receiver and course deviation indicator, and the Type R-476A distance
measuring equipment (DME). The RNAV includes converter circuits
which operate with the VHF navigation receiver and produce positional
information for display by the course deviation indicator. It also includes
computer circuits which combine the bearing information from the
navigation set with the distance information from the R-476A DME to
establish navigation data for selected waypoints. During RNAV opera-
tion, a course scalloping suppressor circuit suppresses the spurious
navigation signal phases to provide stable waypoint information which
enhances autopilot operation. The 400 RNAV is coupled to the number 2
Nav/Com and includes storage for
3
waypoints.
Ground speed/ time-to-station information to the selected VOR (not the
waypoint) is available on this system. This capability, along with the
course scalloping suppression (radial straightening), may be used to an
advantage while tracking inbound or outbound from the VOR station by
programming a waypoint directly over the associated VOR (000.0° /000.0
nautical miles) and using RNAV for course smoothing while enroute.
CAUTION
If RNAV set is removed from the airplane or becomes
inoperative, the associated VHF navigation indicator will
be inoperative.
All operating controls and displays which are part of the RN-478A are
shown and described in Figure
1.
Other controls required for operation of
the Cessna 400 Area Navigation System are included on the VHF naviga-
tion receiver and on the R-476A DME control; these controls are shown and
described in the respective supplements included for this equipment.
1 October 1978 1 of 6