Cessna 172P - Page 266

104
DME
(TYPE
451)
PILOT'S
OPER,ATING
HANDBOOK
SUPPLEMENT
sEcTtoN
4
NORMAL
PROCEDURES
DME
OPERATION
1.
NAV 1
a,nd
NAV
2 VHF Navigation
Iìeoeivers
--
ON;
SET fre-
quency
selector switches to
VOR/DME
station frequencies
as
required.
2. NAV Mo<ie Seleotor
Switch
--
SET
to
NAV 1
or NAV P.
NOTE
\Vhen the VOR frequency is
selected,
the appropriate
DME
frequency
is automatically
channeled.
3. DME
SPEAKER
/PHONE
Selector Switch
(on
audio control
panel)
--
SET to desired mode
to identify
station ident tone.
4. DME Display
Selector Switch
--
SELECT desired readout.
DME HOLD FUNCTION
The
HOLD
position
is selected
when the currently
controlling Nav
receiver
(1
or 2) frequency is about to
be
changed
but the
pilot
wishes the
DME to remain
operating on
the
current frequency
after the navigation
frequency has
been
changed,
1. NAV Mode Selector
Switch
--
SELECT
HOLD
CAUTION
Inadvertent switching to any
other DME Nav Mode
posi-
tion
other than HOLD must be avoided, since this
could
ca,use the
DME to display
erroneous information.
2. NAV
1
or
NAV
2 Receiver
--
SELECT
new operating frequency
SECTION 5
PERFORMANCE
There is no change to the airplane
performance
when this avionic
equipment
is installed. However, the installation
of an externally-
mounted antenna or several related
externa,l antennas, will result in a
minor reduction in cruise
performance.
4 30 May
1980