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PILOT'S OPERATING HANDBOOK
SUPPLEMENT.
CESSNA
400
TRANSPONDER
AND ENCODING ALTIMETER
1.
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
automa
tically by the interrogating signal.
2.
REPLY LAMP - Lamp flashes
to
indicate transmission of reply pulses;
g
lows
steadily to indicate transmission of IDENT pulse or satisfactory self-test
operation. (Reply Lamp will also
g
low steadily during initial warm-up period.)
3.
IDENT (ID) SWITCH - When depressed, selects special pulse
identifie
r 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 !DENT pulse transmission.)
4.
DIMMER (DIM) CONTROL - Allows pilot to control brilliance of Reply Lamp.
5.
SELF-TEST (TEST) SWITCH - When depressed, causes transponder to gen-
erate a self-interrogating
sig na
l
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 INDIC ATOR -
Pro
vides
dig
ital altitude
reado
ut
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, 000-foot window.
9.
OFF INDICATOR WARNING FLAG - Flag appears across
altitude
readout
when power is removed from
a
ltimeter to indicate that readout is not reli able.
10.
100-FOOT DRUM TYPE INDICATOR - Provides digital altitude r eadout in
100-foot increments between
O
feet and 1000 feet.
11.
20-FOOT INDICATOR NEEDLE - Indicates altitude in 20-foot
increments
between
O
feet and 1000
feet.
12.
ALTIMETER SETTING SCALE - DRUM TYPE - Indic ates selected
a
lti-
meter setting in the range of 28. 1
to
30. 99 inches of mercury on the stan-
dard
altime te
r or
946 to
1049 millibars on the optional
altime ter.
13.
ALTIMETER SETTING KNOB - Dials in desired
alti
meter setting in the
range of 27. 9 to 31. 0 inche
s
of mer cury on standard altimeter or 950 to
1050 millibars on the optional
alti
meter.
Figure 1. Cessna 400 Transponder and Encoding Altimeter
Operating Controls (Sheet 2 of 2)
3
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