Cessna TURBO CENTURION T210M 1978 Pilot Operating Handbook page 266

CESSNA 400 NAV/COM
(RT-485A) WITH CESSNA
400 RNAV (RN-478A)
PILOT'S OPERATING HANDBOOK
SUPPLEMENT
the converter circuits in the RN-478A Area Navigation Computer. The
converter processes the received navigation signal to provide omni
bearing or localizer information for display by the course indicator.
CAUTION
If the RNA V set is removed from the airplane or becomes
inoperative, the associated VHF navigation indicator will
be inoperative.
The course indicator includes a Course Deviation Indicator (CDI), an
Omni Bearing Selector (OBS) or Automatic Radial Centering (ARC) knob,
and OFF (or NAV)/To-From Indicator Flags. It also includes an RNAV
lamp (RN) which lights when area navigation operation is selected, and a
back-course lamp (BC) which lights when back-course operation is
selected. The IN-442AR is offered as the standard Course Deviation
Indicator and an optional IN-1048AC Course Deviation Indicator is also
offered when Automatic Radial Centering (ARC) is desired. When the
optional IN-1048AC Course Deviation Indicator is installed, an Automatic
Radial Centering lamp (ARC) is incorporated in the CDI to alert the pilot
that the Automatic Radial Centering feature has been selected.
All operating controls and indicators for the Cessna 400 Nav/Com a re
included on the front panel of the RT-485A Receiver-Transmitter and the
associated Course Deviation Indicator. These controls and indicators are
shown and described in Figure 1. Opera ting controls for the RN-4 78A Area
Navigation Computer, which are used for area navigation, and operating
controls for the associated Type R-476A DME are shown in the appropriate
supplements in this manual.
SECTION 2
LIMITATIONS
There is no change to the airplane limitations when this avionic
equipment is installed. However, the pilot should be aware that on many
Cessna airplanes equipped with the windshield mounted glide slope
antenna, pilots should avoid use of 2700 ±100 RPM on airplanes equipped
with a two-bladed propeller or 1800 ±100 RPM on airplanes equipped with a
three-bladed propeller during ILS approaches to avoid oscillations of the
glide slope deviation pointer caused by propeller interference.
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