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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

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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

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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

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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

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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