Cessna 172P Pilot's Operating Handbook And Flight Manual page 265

PILOT'S OPERATING HANDBOOK
SUPPLEMENT
104
DME
(TYPE
4õ1)
4.
NAV
MODE SELECTOR SWITCH -
Appliea powor
to the
DME
and selects DME
operatlng modes
as
follows:
OFF:
Turns
the
DME
OFF.
NAV
1:
Selects
DME operation
with
No.
1
VHF naviga,tlon
eet; enebles
channel solectlon by
Nav
1
frequonoy selector swltchee.
HOLDì
Selects DME
momory
clrcuitl
DME
remalne ohanneled to stetion
to
which it was lost channeled whon HOLD wes selected and
will
continue to
display information rtilative to this
oha4nel.
Allows both
the
Nav
I
and
Nav 2 navigation receivers
to
be set
to
new
operational
frequencies
without
a,ffectlng
the
previously
selected
DME
operatlon.
CAUTION
In
the Hold
mode
thore is no
annunci¿tion
of
the
VOR/DME station
frequency. However,
an
annunciator labeled
"HLD"
will
illuminate
on the
DME
to
flag
the
pilot
tha,t the
DME
is in
the
Hold
mode'
NAV
2:
Selects
DME oper&tion
with
No'
2 VHF na,vigation
seti eneblos
channel
Bel€ction
by Nav
2
frequency aelector swftches.
RNAV:
Selects
e,roa,
navigetion operetion,
Brightnoss of
this switch is
controllod by
the
radio
light
dimming
rheosta,t.
5.
HOLD ANNUNCIATOR (HLD) -
Illuminates
a,mb€r
to
indicate
HOLD mode
is
selected.
6,
WAYPOINT
ANNUNCIATOR (WPT) -
Illuminates
ember
to
indicate
RNAV
mode
is
selected.
(Annunciator
will
not
illumlna,te when DME
is installed
wlthout
RNAV,)
Figure
1.
IND-4ã0C
Indicator
(Sheet
2
of
2)
3
30
May
1980