Cessna 172P - Page 280

12A
RNAV
(TYPE
ANS-351C)
PILOT'S
OPER,ATING
HANDBOOK
SUPPLEMENT
flagged
with
either
the
word
"Vor" or
"Loc"
to
alert the
pilot
that
RNAV
mode is
inactive.
An
additional
flag
circuit
is
provided
in
ttre
cnr which
causes a red
OFF
flapç
to appoa,r
anytime
a
non-usable
VOR/
DMEI
signal
is
being received.
CAUTION
If RNAV
set is removed
from
the
airptane
or
becomes
inoperative,
the
associated
VHF navigation
indicator
will
be inoperative.
The DME-451
system
used
AV
system
co_nsists
of a
panel-mounted
I
ly-mounted
TCR-451
Transceiver
and
an ex
Except
for
selection
of the operating
channel,
which is selected
by the
VHF navigation
receiver
frequency
selector
switches, the DME-451
sys-
tem is capable
of independent
operation.
However,
onl.y the RNAV
mode is
to
be
used
with this RNAV
system.
The DME-4ã1
transmits
interrogating
pulse pairs
on 200 channels
between 1041
MHz and 1150
MHz; it
receives
associatod
ground-to-air
replies
between
978 MHz
and lP18 MHz. The
IND-
4õ0C digitally
displays
distances
to or from
the
selected station up to
200
nautical miles,
aircraft
ground
speed from
30 to Bgg knots,
or time-to-
station with
a maximum time
of 120
minutes. A Nav mode
selector
switch
provides
seloction of
ON/OFF, Nav 1, Nav
2, HoId
and RNAV operation. A
DME display
selector
switch
provides
seleation
of
distance
to or
from
station
(NM),
airoraft
ground
speed
(KTS)
or
time-to-station
(MIN).
An
ambient light
sensor automatically
controls
display intensity.
AII
operating controls
and displays
which
are
part
of the ANS-85lC
Area Navigation
Computer,
IND-45OC
Indicator
and
Course Deviation
Indicators IN-4424R
and IN-4434R
are
shown
and described
in Figure 1.
Other controls required
for
operation
of the
ANS-351C nNAV
systemwith
DME-451
are included
on
the VHF
Nav 2 receiver
and are
shown and
described in
the 300 and
400 Nav/Com
(Types
RT-3854
anrt RT-4854)
Supplements
in this section.
2
30
May 1980