Cessna 172P - Page 325

PILOT'S
OPERATING
HANDBOOK
SUPPLEMENT
18
CESSNA 8OO
TRANSPONDER,
AND ENCODING
ALTIMETER,
3.
IDENT
pulse
transmisslon.)
4. DIMMER
(DIM)
CONTROL
-
Allows
pilot
to control
brilliance
of reply
lamp'
5. SELF -TEST
(TST)
SWITCH
j
When depressed,
causes
transponder
to
g€nerate a,
solf-interrogating
signal
to
provide
a check
of
transponder
operation.
(Reply
Lamp
will
glow
steedily to verify solf test
operation.)
6.
REPLY-CODE
SELECTOR, KNOBS
(4) -
Select
assigned
Mode
A reply
code'
7, REPLY-CODE INDICATORS
(4) -
Display
selected
Mode A reply
codo.
8. 1000-FOOT
DRUM TYPE INDICATOR
-
Provides digital
attitude
readout
in 1000-
foot
increments
betwe€n
-1000
feet and
+35,000
feet. When
altitude
is below
10,000
feot, a diagonally strtped
flag
appears
in the 10,000
foot window.
s.
OFF INDICATOR WARNING
FLAG - Flag appears a,cross
a,ltitude
readout
when
power
is removed
from the altimeter
to
indicate
that readout
is not
reliable.
10. 100-FOOT DRUM TYPE INDICATOR
-
Provides digitat altitude
readout
in 100-
foot increments between 0 feet and 1000 feet,
11. zO-FOOT
INDICATOR
NEEDLE - Indica,tes a,ltitude in 2o-foot
increments
between 0 feot and 1000 feet.
12.
ALTIMETER SETTING SCALE
-
DR,UM
TYPE
-
Indicates
selocted
altimeter
setting in the range of 27,9 to 31.0
ihches of
mercury on the
stendard
altimeter
or
950 to 10õ0 millibars on the optional altimeter.
13. ALTIMETER
SETTING KNOB
-
Dials in
desired
altimeter
setting in
the range
of
27.9 to 31.0 inches
of mercury on the
standard
altimeter or 950
to 1050 millibars
on
the
optional
altimeter.
sEcTroN
2
LIMITATIONS
There
is
no
change to
tho
a,irplane
performance
when this avionic
equipment
is installed.
However,
the encoding
altimeter used
in this
installation
does have
a
limitation
that requires
a standa,rd barometric
altimeter
to
be
installed
as
a beck-up a,ltimeter.
Figure
1.
Cessna 300 Transponder
and
Encoding
Altimeter
(Sheet
2
ot 2)
3
30 May 1980