Cessna 172P - Page 351

22
PILOT'S OPER,ATING
HANDBOOK CESSNA
4OO TR,ANSPONDE¡N,
SUPPLEMENT
AND ALTITUDE
ENCODER
(BLIND)
2. Function Switch
--
ON.
3. DIM Control
--
ADJUST light brilfianco
of reply lamp.
NOTE
During normal operation
with function switch in ON
position,
reply lamp
flashes
indicating
transponder
rep-
ì.ies to interrogations.
ID Button
--
DEPRESS momentarily when
instructed
by
ground
controller
to
"squawk
IDENT"
(reply
lamp will
glow
steadily,
indicating IDENT operation).
TO TRANSMITMODE
C
(ALTITUDE
REPORTING)
CODESINFLIGHT:
1.
Reply-Code Solector Switches -- SELECT assigned oode.
2. Function Switch
--
ALT.
NOTE
When
directed
by
ground
controller to
"stop
altitude
squawk", turn Function SwÍtcb to ON for
Mode A opera-
tion only.
NOTE
Pressure
altitude is
transmitted by the transponder for
altitude squawk and conversion to
indicated altitude is
done in ATC computers. Altitude squawked wiII only
agree
with
indicated altitude when the
looal altÍmeter
setting in use by the
ground
controller is set
in the airoraft
altimeter.
3. DIM Controt
--
ADJUST light
brilliance
of
reply
lamp.
TO
SELF-TEST TRANSPONDER
OPER,ATION:
1. Funation
Switch
--
SBY
and wait 30 seconds for equipment to
rvarm-uP.
2.
Function Switch
--
ON.
3. TEST Button
--
DEPRE¡SS
(reply
lamp should light
brightly
regardless of DIM control setting).
4,
TEST
Button --
RELEASE for normal operation.
4
30 May
1980