Cessna 172P - Page 357

PILOT'S
OPERATING
HANDBOOK
SUPPLEMENT
23
CESSNA
4OO TRANSPONDEN,
AND
ENCODING
ALTIMETER,
2. Function Switch
--
ON.
3.
DIM Control
--
ADJUST light brillianoe of
reply
lamp.
NOTE
Durlng normal operation
with function switch
in ON
position,
REPLY
lamp
flashes
indicating üransponder
replies to interrogations.
4. tD Button
--
DEPH,ESS
momentarily
when instructod
by
ground
controller to
"squawk IDENT"
(nEPf,Y
lamp
will
glow
steodily'
indicating IDENT operation).
TO TR,ANSMIT MODE C
(ALTITUDE
REPORTING) CODES
IN FI,IGHT:
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. Itreply-Code Selector Switches
--
SELECT
assignod
code.
4. Function Switch
--
ALT.
NOTE
When
dirècted by
ground
controller
tò
"stop
altitude
squawk", turn Function
Switch
to ON for Mode
A opera-
tion only.
NOlE
Pressure
altitude is transmitted
by the
transponder
for
altitude
squawk and conversion to indicated
altitude is
done in .A'TC
computers.
Altitude
squawked
will only
agree with
indicated altitude when the local
altimeter
setting
in
use by the
ground
controller
is set
in the
encoding altimeter.
6. DIM
Control
--
ADJUST light
brilliance
of reply
lamp.
TO SELF-TEST TR,ANSPONDER,
OPER,ATION:
1. Function
Switch --
SBY and
wait
9O seconds for equipment
to
wa,rm-uP.
2. Function
Switch
--
ON
or
ALT.
3.
TEST Button
--
DEPRESS
and
HOLD
(Reply
lamp should light
with full
brilliance rogardless
of DIM control
setting).
4.
TEST Button --
RELEASE for normal
operation.
5
30 May
1980