20
CESSNA 400 TRANSPONDER
PILOT'S OPERATING HANDBOOK
AND ENCODING ALTIMETER
SUPPLEMENT
Figure 1. Cessna 400 Transponder and Encoding Altimeter
Operating Controls (Sheet 1 of 2)
2
1 July 1979
20
PILOT'S OPERATING HANDBOOK
CESSNA 400 TRANSPONDER
SUPPLEMENT
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 automatically by the interrogating signal.
2.
REPLY LAMP - Lamp flashes to indicate transmission of reply pulses; glows
steadily to indicate transmission of IDENT pulse or satisfactory self-test opera-
tion. (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 aircraft
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 (TEST) SWITCH - When depressed, causes transponder to generate 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 and +35,000 feet. When altitude 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 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 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.
13.
ALTIMETER SETTING KNOB - Dials in desired altimeter setting in the range of
27.9 to 31.0 inches of mercury on standard altimeter or 950 to 1050 millibars on the
optional altimeter.
Figure 1. Cessna 400 Transponder and Encoding Altimeter
Operating Controls (Sheet 2 of 2)
1 July 1979
3
