Cessna 1980 172RG Cutlass Pilot Operating Handbook page 137

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CESSNA 300 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.
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)
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PILOT'S OPERATING HANDBOOK
SUPPLEMENT
1 July 1979
'
S OPERATING HANDBOOK
PILOT
SUPPLEMENT
IDENT (ID) SWITCH - When depressed, selects special pulse identifier to be
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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.
SELF-TEST (TST) SWITCH - When depressed, causes transponder to generate a
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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.
REPLY-CODE INDICATORS (4) - Display selected Mode A reply code.
7.
1000-FOOT DRUM TYPE INDICATOR - Provides digital altitude readout in 1000-
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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.
100-FOOT DRUM TYPE INDICATOR - Provides digital altitude readout in 100-
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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.
ALTIMETER SETTING KNOB - Dials in desired altimeter setting in the range of
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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
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CESSNA 300 TRANSPONDER
AND ENCODING ALTIMETER
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