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ND ENCODING ALTIMETEH
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,",OT'S OPERATING HANDBOOK
IIII' PLEMENT
CESSNA 400 TRANSPONDER
AND ENCODING ALTIMETER
Figure 1.
Cessna 400 Transponder and Encoding Altimeter
Operating Controls (Sheet 1 of 2)
2
I.
FUNCTION SWITCH - Controls
application
of power and selects
transponder
operating
mode as follows:
OFF - Turns
set off.
SBY - Turns
set on for equipment
warm-up
or standby power.
ON
- Turns
set on and enables
transponder
to transmit
Mode A (aircraft
identification)
reply pulses.
ALT - Turns set on and enables transponder
to transmit either Mode A
(aircraft
identification)
reply pulses
or Mode C (altitude
reporting)
pulses
selected
automatically
by the interrogating
signal.
2.
REPLY LAMP - Lamp flashes
to indicate
transmission
of reply pulses;
glows
steadily
to indicate
transmission
of !DENT pulse or satisfactory
self-test
operation.
(Reply Lamp will also glow steadily
during
initial warm-up
period. )
3.
IDENT (ID) SWITCH - When depressed,
selects
special
pulse identifier
to be
transmitted
with transponder
reply to effect immediate
identification
of air-
craft on ground controller's
display.
(Reply Lamp will glow steadily
during
duration
of IDENT pulse transmission.
)
4.
DIMMER (DIM) CONTROL - Allows pilot to control
brilliance
of Reply Lamp.
5.
SELF-TEST
(TST) SWITCH - When depressed,
causes
transponder
to gen-
erate
a self-interrogating
signal to provide
a check of transponder
operation.
(Reply Lamp will glow steadily
to verify self test operation.
)
6.
REPLY-CODE
SELECTOR
SWITCHES (4) - Select assigned
Mode A Reply
Code.
7.
REPLY-CODE
INDICATORS (4) - Display selected
Mode A Reply Code.
8.
1000-FOOT
DRUM TYPE INDICATOR - Provides
digital altitude
readout
in 1000-foot
increments
between
-1000 feet and +35,000 feet.
When alti-
tude is below 10,000 feet,
a diagonally
striped
flag appears
in the
10, OOO-foot window.
9.
OFF INDICATOR WARNING FLAG - Flag appears
across
altitude
readout
when power is removed
from altimeter
to indicate
that readout
is not reliable.
10.
100-FOOT
DRUM TYPE INDICATOR - Provides
digital
altitude
readout
in
100-foot increments
between 0 feet and 1000 feet.
11.
20-FOOT
INDICATOR NEEDLE - Indicates
altitude
in 20-foot
increments
between 0 feet and 1000 feet.
12.
ALTIMETER
SETTING SCALE - DRUM TYPE - Indicates
selected
alti-
meter
setting
in the range of 28. 1 to 30.99 inches of mercury
on the stan-
dard altimeter
or 946 to 1049 millibars
on the optional
altimeter.
13.
ALTIMETER
SETTING KNOB - Dials in desired
altimeter
setting
in the
range of 28. 1 to 30.99 inches of mercury
on standard
altimeter
or 946 to
1049 millibars
on the optional
altimeter.
Figure 1.
Cessna 400 Transponder and Encoding Altimeter
Operating Controls (Sheet 2
of 2)
3
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