Cessna 172P - Page 327

PTLOT'S
OPER,ATING
HANDBOOK
SUPPLEMENT
18
CESSNA
3OO
TR,ANSPONDEIì
AND ENCODING
ALTIMETER,
4,
tD Button
--
DEPRESS
momontarily
when
instructed by
ground
controller to
"equawk IDENT"
(repty
lamp
will
glow
steadily,
indicating IDENT
operation).
TO
TRANSMTI
MODE
C
(ALTITUDE
REPORTING) CODES
INFLIGHT:
1.
Off
Indicator
Warning Flag
--
VERIFY that flag
is
out of
view
on
encoding altimeter.
2.
Altitude Encoder Altimeter
Setting
Knob
--
SET
IN assigned
local
altimeter setting.
3.
Reply-Code Selector Knobs
--
SELECT assigned
code.
4. Function Switch
--
ALT.
NOTE
When
directed
by
ground
controller to
"stop
altitude
squawk", turn
Function Switch to ON for Mode
A
opera-
tion only.
NOTE
Pressurp
altitude is transmitted
by
the transponder
for
altitude' squawk
and conversion
to
indicated altitude
is
accomplished
in ATC computers.
Altitude
squawked
will
only agree
with indicated
attÍtude
when the
local altimeter
setting in use by
the
ground controller
is set
in the
encoding altimeter.
5.
DIM
Control
--
ADJUST light
brilliance of reply
lamp.
TO
SELF-TEST TR,ANSPONDEII
OPERATION:
1. Function
Switch --
SBY
and wait 30
seconds
for equipment to
werm-uP.
2.
Function
Switch
--
ON or ALT.
3.
TST Button
-- DEPRESS and HOLD
(reply
lamp should light
with
full brilliance
regardless of
DIM
control setting).
4. TST Button
--
Release for
normal
operation.
sEcfloN
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 external
antennas,
will result
in a minor
reduction
in cruise
performa,nce.
30 May 1980
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