.5
CESSNA 300 TRANSPONDER
PILOT'S OPERATING HANDBOOK
AND ENCODING ALTIMETER
SUPPLEMENT
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.
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.)
Figure 1. Cessna 300 Transponder and Encoding Altimeter (Sheet 1 of 2)
2
1 July 1979
15
PILOT
'
S OPERATING HANDBOOK
CESSNA 300 TRANSPONDER
SUPPLEMENT
AND ENCODING ALTIMETER
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 (TST) 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 KNOBS (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 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 the 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 the standard altimeter or 950 to 1050 millibars on
the optional altimeter.
SECTION 2
LIMITATIONS
There is no change to the airplane performance when this avionic
equipment is installed. However, the encoding altimeter used in this
installation does have a limitation that requires a standard barometric
altimeter to be installed as a back-up altimeter.
Figure 1. Cessna 300 Transponder and Encoding Altimeter (Sheet 2 of 2)
1 July 1979
3
