TM 55-1510-222-10
3.
RANGE switches - Press and release as
required.
4.
TILT control - Move up or down to
observe targets above or below aircraft
level. The echo display will change in
shape and location only.
(3) Test procedure:
1.
Function switch - TEST.
2.
RANGE switches _ Press and release
as required to obtain 80-mile display.
3.
BRT control - As required.
4.
Screen - Verify proper display. (The
test display consists of two green bands,
two, yellow bands, and a red band on a
120-degree scan. The word TEST will
be displayed in the upper right corner.
The operating mode selected by the
MODE switches, either MAP, WX, or
WXA, will be displayed in the lower left
corner. If WXA has been selected, the
red band in the test pattern will flash on
and off. The range will be displayed in
the upper right corner beneath the word
TEST and appropriate range mark
distances will appear along the right
edge of the screen.)
(4) Weather observation operating procedure:
1.
Function switch - ON.
2.
MODE switches - Press and release as
required to select WX.
3.
BRT control - As required.
4.
TILT control - Adjust until weather
pattern is displayed. Include the areas
above and below the rainfall areas to
obtain a complete display.
5.
MODE switches - Press and release to
select WXA. Areas of intense rainfall
will appear as flashing red. These areas
must be avoided.
6.
TRACK switches - Press to move track
line through area of least weather
intensity. Read relative position in
degrees in upper left corner of screen.
NOTE
Refer
to
FM
1-30
for
weather
observation,
interpretation
and
application.
(5) Ground mapping operating procedure:
1.
Function switch - ON.
2.
MODE switches - Press and release as
required to select MAP.
3.
BRT control - As required.
4.
GAIN control - As required to present
usable display.
(6) Standby procedure: Function switch - STBY.
(7) Shutdown procedure: Function switch -
OFF.
(8) Weather radar emergency operation. Not
applicable.
3-32.
TRANSPONDER SET (APX-100).
a.
Description. The transponder system receives,
decodes, and responds to interrogations from Air Traffic
Control (ATC) radar to allow aircraft identification,
altitude reporting, position tracking, and emergency
tracking. The system receives a radar frequency of
1030 MHz and transmits preset coded reply pulses on a
radar frequency of 1090 MHz at a minimum peak power
of 200 watts. The range of the system is limited to line-
of-sight. The transponder system consists of a
combined receiver/transmitter/control panel (fig. 3-25)
located in the pedestal extension; a pair of remote
switches, one in each control wheel; and two antennas,
located on the underside and top of the fuselage. The
system is protected by the 3-ampere TRANSPONDER,
and 35-ampere AVIONICS MASTER PWR No. 1 circuit
breakers on the overhead circuit breaker panel (fig. 2-6).
b.
Controls/Indicators and Functions.
(1) TEST-GO indicator. Illuminates to indicate
successful completion of built-in-test (BIT).
(2) TEST-MON
indicator.
Illuminates
to
indicate system malfunction or interrogation by a ground
station.
(3) ANT switch. Selects desired antenna for
signal input.
(a) TOP. Selects upper antenna.
3-77
