Cessna 1980 182Q Pilot's Operating Handbook And Flight Manual page 235

PILOT'S OPERATING HANDBOOK
SUPPLEMENT
11
FOSTER AREA NAVIGATION
(TYPE 511)
SECTION 4
NORMAL OPERATION
VOR/LOC OPERATION
VOR NAVIGATION CIRCUITS VERIFICATION TESTS:
1.
See appropriate Nav/Com supplement.
AREA NAVIGATION OPERATING NOTES
1.
Proper RNA V operation requires valid VOR and DME inputs to the
RNA V system. In certain areas, the ground station antenna
patterns and transmitter power may be inadequate to provide valid
signals to the RNAV. For this reason, intermittent RNA V signal
loss may be experienced enroute.
2. When a waypoint from one VORT AC is displaced over a second
VORTAC, interference from the second VORTAC sometimes
causes erratic and unusable BEARING and RANGE displays on
the RNA V at low altitude.
3. The RNA V BEARING readout (to -thewaypoint) becomes
extremely sensitive and may become unusable within 1 ~ 1 1/2
miles of the waypoint. Thus, the RANGE readout is the primary
means of approximating waypoint passage.
4. Tracking from a waypoint is not recommended since the pilot
would have to fly a reciprocal bearing and make error corrections
in the opposite direction from flying to a waypoint.
DIAGNOSTIC FUNCTIONS
All RNA V systems are rendered inoperative under certain conditions.
The RNA V 511 provides a Flag mode and permits a diagnostic interpreta-
tion of why the system is inoperative.
FLAG !\fODE INDICATIONS:
1.
Six ··Bars" Appear in the Digital Displays (2
&
6):
a. PRESS VOR/DME button (5) to determine if the VOR radial
signal is absent.
If
VOR radial signal is absent, bars will
change to show as "000" in the BEARING window (2). (One
possible cause of this condition could be that the NA V receiver
is channeled to a localizer signal.)
b. Excess RADIAL waypoint address entry (11 or 8) such as
360.1
C
or 389
c --
The computer will not accept this entry.
1 October 1979 5