APN-59 2 of 10

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

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Search RADAR AN/APN-59, is

a Primary RADAR

b Secondary RADAR

c Primary and Secondary both

d Enhanced Ground Proximity Warning System

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Q & A


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Objective

After this lesson, the students will be able to understand

APN-59 Components

RT-289

Purpose

Location

Description

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Foreign Object Damage

Preventable Non-Preventable ( hail,

ice, animals, material failure)

RADARSearch & Weather Radar Sys (APN-59) > FOD 2 of 10


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Personnel Safety

Safety harness should be worn when removing and installing antenna

Search and weather Radar (APN-59) >Safety RADAR


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CAUTIONEnsure that the DC power supply output does not exceed 115 VAC and 27 VDC at any time as to ensure that the displays are not damaged

CAUTIONEnsure system power is OFF before removal or installation of control panel. This will prevent component damage caused by voltage spikes

Safeties


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Discrepancy

AN-APN-59 STAB switch is U/S.

Cause

Sys ops checked on ground found working normal.

Remedial Action

All wiring checked all plugs security checked found sat. Entry

subjected to next pilot report.

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Search & Weather Radar Sys (APN-59) > Defect 2 of 10

WXR RADRA CONT PNL

RADAR


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Power supply (PP-1073)

Indicator (IP-268) (top main INST PNL)

Control Unit (C-1242)

Stab data unit (CN-221)

Components


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W/RADAR

Components

Vanexial fans (HD-150)

Receiver/Transmitter (RT-289D)

Antenna (AS -653)

Electronic Control Amplifier (ECA) (AM-853)

Indicator (IP- 239)

Search RADAR AN/APN-59 > Components 2 of 10


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Receiver/Transmitter (R/T 289)

Purpose

Develops the RF pulse and transmits

Processes the received echo signal for use in the navigator’s and Pilot’s Indicators

W/RADARSearch RADAR AN/APN-59 > Components 2 of 10


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Location

On the right side of the nose wheel well

W/RADAR

Forward



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Description All assemblies except

magnetron are located inside the end bells

Pressurized to prevent corona and arcing at high altitudes

O/Ps are taken from

MAIN TRIG jack

AUX TRIG jack

VIDEO jack

W/RADAR

End bells

RT 289



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Description

R/T contains

Receiver

Transmitter

Microwave circuitry

Low voltage power supply

W/RADAR

RT 289



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Description Generates the high

energy RF pulses, which are radiated by the antenna

Receiver circuits Process the radar returns

to display

Have additional capabilities to improve video display under adverse conditions (STC, FTC, IAGC circuits)

W/RADAR

RT 289



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Description Test points

TRANS PWR RECV SENS jack

For checking power O/P and receiver sensitivity

REFLECTED POWER jack

For Making VSWR checks

W/RADAR

RT 289



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Description Test points

Six test jacks in fuse box

For checking of low voltage power supply (-105V, 150V, 250V REG, 300V REG, -225V, and 300V).



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Receiver/Transmitter (R/T 289) Description

Fuses F101 Sweep rotation

F102 Mixer and AFC currents

F103 MAG current

F104 NAV station indicator power supply

F105 Vanaxial Fans, transmitter cct and internal fan

W/RADAR

RT 289



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Description

Spare Fuse Box



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CAUTIONEnsure that the DC power supply output does not exceed 115 VAC and 27 VDC at any time as to ensure that the displays are not damaged

CAUTIONEnsure system power is OFF before removal or installation of control panel. This will prevent component damage caused by voltage spikes

Safeties


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SUMMARY APN-59 Components

RT-289

Purpose

Location

Description

Search and weather Radar (APN-59) > 2 of 10RADAR

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2 of 10W/RADARSearch RADAR AN/APN-59 > Q & A 2 of 10

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2 of 10W/RADAR

Identify C-130E A/C Components

Power supply (PP-1073)

Indicator (IP-268) (top main INST PNL)Synchronizer(SN-198)

Synchronizer Control (C-2302)

Search RADAR AN/APN-59 > Q & A 2 of 10

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2 of 10W/RADAR

If F103 fuse blown off, which current indication will be Zero ?

a MAG current Zero

b Mixer & AFC Currents Zero

c Sweep stuck

d NAV station indicator OFF


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2 of 10W/RADAR

Location of R/T 289 is ?

a Nose wheel well area

b Cargo compartment

c Center U/Deck area

d Under crew bunk seat


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2 of 10W/RADAR

Which LRU have Low voltage power supply ?

a Receiver / Transmitter

b Control Unit

c Electronic Control Amplifier

d STAB Data unit


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2 of 10W/RADAR

If sweep rotation is stuck due to Fuse blown, which LRU have the Defective Fuse ?

a Receiver / Transmitter

b Control Unit

c Electronic Control Amplifier

d STAB Data unit


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2 of 10W/RADARSearch RADAR AN/APN-59 > End 2 of 10

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APN-59 2 of 10

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