Cessna 172P - Page 284

12A
RNAV
(TYPE
ANS-351C)
PILOT'S
OPEF,ATING
HANDBOOK
SUPPLEMENT
15. DME DISPLAY
SELECTOR SWITCH -
Selects desired mode
readouts
as
foltows:
NM Position: Dlsplays
distonce
to or from
the selected
sta,tion or wa,ypoint in
nautical miles
up to 199.9 nmi.
KTS Position:
Displays aircra,ft
ground
spoed up to 399
knots.
MIN Position: Displays time-to-station
or
waypoint with a maximumtime
of.
l2O minutes.
Brightness of this
switch
is
conìrolled
by the
radio
light
dimming rheostat.
16.
NAV MODE SELECTOR SWITCH
-
Applies
power
to the DME
and Eelects DME
opereting modes as follows:
OFF:
Turns the DME OFF.
NAV
1: Selects
DME
operation
with No.
1 VHF
navigetion seti
enables
channel
selection by
Nav
1 frequency seloctor
switohes.
HOLD: Selects DME memory
circuiti DME remains cha,nneled
to stetlon to
which
it wa,s last
channelod when HOLD
was selocted and
wiII
continue to
display information relative to
this channel. Allows both
the Nav
1
and
Nav 2
navigetion receivers
to
be set
to new
operational frequencies
without
affecting the
previously
selected DME operation.
CAUTION
In the Hold mode there is no annunciation of the VOR/DME
station
frequency,
However,
an ¿nnuncirtor l¿beled
"HLD"
will
illuminate
on the DME
to flag the
pilot
that
the DME
Is
in
the Hold mode.
NAV 2:
Selects
DME
operation with No. 2 VHF navigetlon set; €nebles
channel selection by Nav 2 frequency selector switches.
RNAV: Selects area navigation operation with
the
No.2 VHF navigation
set.
Brightness of
this
switch
is controlled
by
the radio light dimming
rheostat.
77.
HOLD ANNUNCIATOR
(HLD) -
Illumina,tes ember
to
indicate HOLD mode
is
selected.
18. WAYPOINT ANNUNCIATOR
(WPT)
-
Illuminates amber
to indicate
RNAV
mode
is
select€d.
19.
COURSE CARD
-
Indioates
selected VOR or RNAV course
under course
index'
20.
BACK-COURSE LIIMP
(BC) -
Amber light iuumina,tes when
an autopilot's
back-course function
is engaged
and receiver is tuned to a
loca,lizer
frequonoy;
indicates cours€ devia,tion
pointer
is reversed, Light dimming is only
evôilable
when instÀlled with
an a,udio
control
penel
incorporeting
the a,nnunciator
lights
DAY/ NITE selector
switch.
2I. AREA
NAV
LAMP
(RN) -
When
gre6n
light is illuminated,
indicates that
RNAV
operation ls selected.
Light
dimming
is
oniy
eva,ilable
when installed
with
an
audio control
panel
incorpora,ting
the annunciator lights DAY/NIîE
selector
switch.
Figure 1. ANS-35lC Computer, IND-450C Indicator
and
Associated CDI Controls
(Sheet
4 of õ)
6
30 May 1980