Cessna 172P - Page 321

17
PILOT'S OPERAÎING
HANDBOOK
CESSNA
3OO
TRANSPONDER
SUPPLEMENT
AND
ALÎITUDE
ENCODER
(BLIND)
2.
Functfon Switoh
--
ON.
3,
DIM
Control
--
ADJUST
llght
brilliance
of
reply
lamp'
NOTE
During
normal operation
witJr
funotion
switch
itr
ON
positiõn,
reply
la,rrp
flir,shes
indicating
transponder
rep-
lies to
interrogations.
4, ID Button
--
DEPRESS
momentarily
when
instructed
by
grou,nd
oontrollorto..squawkIDENT,'(replylampwillglowsteadily'
indicating
IDENT
o¡reration).
TO
TRANSMTT
MODE
C
(AT,TITUDE REPOIITTNG)
CODES
INFLTGHT:
1. Reply-Code
Selector
Knobe
--
SELECT
ossigned
oode'
2. Funotion
Switch
-- ALT.
NOTE
by
ground
oontroller
to
"stop altitude
Function
Switch
to ON
for
Mode
A opera-
NOTE
Pressure
altitude
is
transmitted
by the
transponder
for
altitude
squawk and
conversion
to
indicated
altltude
is
done in ATC
computers.
Altitude squawked
will
only
agree with
indioated
altitude when
the
local
alti¡neter
setting in
use by the
ground
controlter
is set
in the
aircraft
altimeter.
When directed
squawk",
turn
tion only.
3. DIM
Control
--
ADJUST
light
brilliance
of
reply
lamp.
TO
SELF-TEST
TRANSPONDER
OPERATION:
1. Function Switch
--
SBY and wait 30 seconds
for eguipment
to
warm-up.
2.
Funation
Switch
'-
ON or ALT.
3.
TST
Button
-- DEPRESS
(reply
lamp
should
light brightly
regard-
less of DIM
control
setting).
4. TST
Button
--
Release
for normal
operation.
5
30 May 1980