Cessna 172P Pilot's Operating Handbook And Flight Manual 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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