Cessna 172P - Page 282

12A
RNAV
(TYPE
ANS-351C)
PILOT'S
OPER,ATING
HANDBOOK
SI'PPLEMENT
4
f
. AMBIENT
LIGHT
SENSOR -
Senses arnbient
cockpit
light
a,nd
controls bright-
ness
of digital
displays
(5,
6, 7) and
ENR/APPR annunciators
(3).
2.
MODE
CONTROL KNOB
-
Selects ENR
(enroute)
or
APPR,
(approaoh)
modes of
op€ration.
In the
enroute mode,
CDI deviation
ie
I
nml/dot,5 nmi
full
scale. In
approach,
deviatlon is 0.25
nmi/dot, L 114
nmi full scale defleotion
out to 4O nmi
from the
waypoint.
8. ENR,OUTE
AND .A'PPROA'CH
MODE ANNUNCIATOR,
LIGHTE¡
(ENR,/APPR)
-
When
the
annuncia,torlight
illurnlnates
amberundereitherENRor
APPR, modes,
it indica,t€s
selection
of ENR
(enroute)
Bensitivity
(1
nmi/dot) or
APPR
(approach)
sensitivity
(0.25
nmi/dot).
4.
WAYPOINT
SELECTOR KNOB
(WPT)
-
Selects
the
desired display wa,ypoints,
from 1 through
8.
5.
WAYPOINT NUMBER,
DISPLAY
(WPT
1 thru 8)
-
Digitally
displays
(from
1 thru
8)
the solected
waypoint d€finêd by
the displayed
data.
A
bllnking
number
indicates
a
non-active
wa,ypoint; continuously
ON
number indicetos
the active
waypoint.
6. RADIAL
DISPLAY READOUT
(RADIAL)
-
When
DME is eet to
RNAV
mode, the
computor will
digitally
display the VOF,
RADIAL
from the reference station on
which the waypoint
is loca,ted.
\ltlhen the DME
ts set to Nav 1, Hold, or Nav 2, the
computer
display will
spell out
"Vor" when
a VOR frequency is selected on
the
Nav recoiver,
or
"Loc"
will be
spelled out
if
a localizor
frequency is selocted on
the
Nav receivor.
NOTE
Four
zeros
will be displayed
untll
dosired
rodial
data
ís dialed in.
7.
DISTANCE DISPLAY
READOUT
(DISTANCE) -
Digitally displays DISTANCE
in
nautical miles from the
referetrce sta,tion to the waypoint,
NOTE
Three
zeros will be displayed until desired distance data
is
dieled
in.
8, DISTANCE SELECTOR KNOBS -
Sets
distanc€ informetion
in
neuticel
miles
into tho display. Two
concentric
knobs control information
as follows:
Large outer knob:
Cha,nges
disple,y
in
10 nml incremeuts.
Smelì inner knob
:
Pushed
in,
changes display ln 1 nmi lncrernents.
Pulled
out, changes
display
in 0.1 nmi
increments whenl€ss tba,n
100 nmi.
Beyond
100
nmi,
changes
dlsplay
in 1 nml incremeuts.
Figure 1. ANS-3õlC
Computer, IND-450C
Indicator
and Associated
CDI Controls
(Sheet
2 of
5)
30
May
1980