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Objective
After this lesson, the
students will be able to
understand
Control unit C-1242
Purpose
Location
Description
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Foreign Object
Damage
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WARNING
Ensure that electrical
power has been removed
from system prior to
removing or installing acomponent.
Failure to comply may
result injury to personnel
or damage to equipment
Search & Weather Radar Sys (APN-59) > Safety 3 of 10
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WARNING
Ensure that electrical
power has been
removed from system
prior to removing or
installing acomponent
Failure to comply
may result in injury to
personnel or damage
to equipment
RADAR
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Discrepancy
repeater IP-268 is U/S.
Cause
Found IP-268 pilot STN
faulty.
Remedial Action
IP-268 replaced with S/Aone ops checked on ground
thoroughly found sat.
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Control Unit (C-1242)
Location
located on navigatorcontrol panel
FORWARD
Components
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Control Unit (C-1242)
Description
Contains most of theoperating controls of the
radar
Components
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Control Unit (C-1242)
Operating Controls
Function switchTo energize the radar and
select the mode ofoperation
OFF :All power is removedexcept for dial illuminationand fuse box.
STBY :All circuits excepttransmitter is ON
SEARCH:Radar is activatedfor search function
Components
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Control Unit (C-1242)
Operating Controls
Function switch
BEACON: Radar isactivated for beaconfunction (not in use)
WARN: Radar is activatedfor warn function
Components
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Control Unit (C-1242)
Operating Controls
RANGE (NM) switch
50/10: PPI range is 0-50miles with10-mile Rangemarks
100/20:PPI range is 0-100miles with20-mile Rangemarks
240/30:PPI range is 0-240
miles with30-mile Rangemarks
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Control Unit (C-1242)
Operating Controls
SCAN switchTo select type of antenna
scan
L position:Antennarotates CCW (10-15RPM)
OFF position:Antenna isstationary
R position:Antennarotates CW (10-15 RPM)
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Control Unit (C-1242)
Operating Controls
SCAN switch
PPI position:antennarotates CW (10-15 or 457 RPM) depending onrange and mode of
operation.
SECTOR:Antenna scansback and fourth acrosslubber of airplane (10-15RPM)
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Control Unit (C-1242)
Operating Controls
TILT controlTo control tilt of radar beam
Radar beam tilt
o +10to - 15
Tilt setting refers towhere the center of thebeam is aimed
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WARNING
Ensure that electrical
power has been removed
from system prior to
removing or installing acomponent.
Failure to comply may
result injury to personnel
or damage to equipment
Search & Weather Radar Sys (APN-59) > Safety 3 of 10
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SUMMARY
Purpose of Control unit C-1242
Location of Control unit C-1242
Description of Control unit C-1242
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Q & A
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How we can rotate the Radar transmitting beam ?
a By transmitting omnidirectional patternb By transmitting from more than one
directional antenna
c By moving radar antenna reflector
assemblyd by changing its transmitting frequency
Q & A
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Range of the targets is achieved by ?
a Transmitted powerb Reflection time
c Receiver sensitivity
d Receiver gain
Q & A
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In R/T 289/APN-59 radar sys, STC, FTC, IAGC circuits
are used
a To improve stabilization function
b To increase range
c To improve video display under normal
conditions
d To improve video display under adverse
conditions
Q & A
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Q. When SCAN switch is placed on L position,
antenna RPM will be
a 10 to 15 CWb 38 to 52 CW
c 10 to 15 CCW
d 38 to 52 CCW
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Q & A
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How we can detect the targets above or below own A/C
altitude ?
a By transmitting beam in omnidirectional
patternb By transmitting beam from more than one
directional antenna
c By moving radar antenna reflector
assembly horizontallyd By moving radar antenna reflector
assembly vertically
Q & A
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End
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