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RADAR

Search and Weather Radar (AN/APN-59) >

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Objective

After this lesson, thestudents will be able to

understand

Antenna (AS-653) and

Stab data unit (CN-

221)

Purpose

Location

Description

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Foreign Object

Damage

Search & Weather Radar Sys (APN-59) > FOD 7 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 injury to personnel

or damage to equipment

Search & Weather Radar Sys (APN-59) > Safeties 7 of 10

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WARNING


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/A one OPS

checked on ground thoroughly

found sat.

Search & Weather Radar Sys (APN-59) > Defect 7 of 10

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AntennaPurpose

Provide means to transmitRF signal and receiveecho signal

Antenna is used to

Shape the radar beam

Tilt the radar beam

Rotate the radar beam

Stabilize the radar beam

Components

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Antenna

LocationInside nose radome

8

Components

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Antenna

Description Two sub assemblies

Reflectors

Antenna pedestal

Reflectors

Antenna pedestal

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Components

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Antenna

DescriptionReflector assembly

Suspended from the

pedestal

Free to rotate through

360 degrees

A single upper half mates

with either of two lowersections

Two lower sections (for

fan & pencil beam)Reflectors

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Components

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Antenna

DescriptionAntenna pedestal

Contains

Azimuth drive motor

Stabilization gimbals

rings

Pitch and Roll servo

motors

Synchros

Antenna pedestal

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Components

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Antenna

DescriptionData transfer from

pedestal assembly to

reflector assembly

Electrical slip rings

RF Energy

Through the circular

waveguide

Stabilization data

By means of pushrods

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Components

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Stab data Unit

Purpose

Provides electrical pitch

and roll data for use in

the antenna stabilization

circuits

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Components

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Stab data Unit

Location

Inside nose radome

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Components

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Stab data Unit

Description

Stab unit houses a

gyroscope

Sealed and

dehumidified by a silica

gel desiccators

Stabilizes the antenna

during change in

airplane attitude

Up to 15 degree in

pitch

Up to 30 degrees in

roll

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WARNING


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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WARNING


power has been removed

from system prior to

removing or installing acomponent.

Failure to comply may

result injury to personnel

or damage to equipment


RADAR

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SUMMARY Purpose of Antenna & Stab data un

Location of Antenna & Stab data un

Description of Antenna & Stab data un

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Q & A

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Q & A

RF Energy is transferred from

antenna pedestal to antenna reflector

assembly through ?

a Slip rings

b Push rodsc Circular W/Guide

d Electrical cable

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Stabilization data is transferred from

antenna pedestal to antenna reflector

assembly through ?

a Slip rings

b Push rodsc Circular W/Guide

d Electrical cable

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Q & A

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AN/APN-59 Antenna reflector

assembly consist of ?

a One upper half and two lower

half sections

b One lower half and two upperhalf sections

c One lower half and one upper

half sections

d Two lower half and two upperhalf sections

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Q & A

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AN/APN-59 STAB Data unit contains ?

a Servo motors

b Gyro

c Accelerometers

d Relays and amplifiers

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Q & A

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Identify the locations

Stab data Unit

Antenna

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Q & A

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Q & A

APN-59 7 of 10

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Transcript of APN-59 7 of 10