AN/ASN-157 Doppler Navigational System

AN/ASN-157 Doppler Navigational System

SYSTEM DESCRIPTION

SYSTEM PARAMETERS

The AN/ASN-157 is a Doppler navigational system which determines

Frequency: 13.325 GHz

Power: 50 mW

aircraft velocity and position. The planar-array antenna/transceiver

unit is attached to the underside of the aircraft fuselage.

HAZARD CONTROLS (to reduce or eliminate risk)

SYSTEM HAZARDS

Power Density Levels (PDL) ....

This system is not able to produce potentially hazardous PDLs in excess of the safety

standard.

RF shock/burn .....................

Observe standard RF shock precautions. Do not touch the antenna when energized.

Other.................................

Consult the equipment Technical Manual for other operator and/or maintenance hazards.

AN/ASR-9 Airport Surveillance Radar (ASR)

SYSTEM DESCRIPTION

SYSTEM PARAMETERS

The AN/ASR-9 is an airborne surveillance radar system that

Frequency: 2.7 2.9 GHz

Power: 1570 W max

utilizes a reflector antenna mounted atop a tower.

SYSTEM HAZARDS

HAZARD CONTROLS (to reduce or eliminate risk)

Power Density Levels (PDL) ....

When in the normal scanning mode, this system is not able to produce potentially

hazardous PDLs in excess of the safety standard. In the nonscanning mode this system is

able to produce PDLs in excess of 5x the standard and requires a formal RFR safety

program to ensure its safe use. Establish a Nonionizing Radiation Protection Program

(IAW guidelines provided in this TB) .

Hazard distance from antenna ....

In the nonscanning mode, exclude personnel to a distance of 50 m from the antenna.

Power density levels in excess of 5x the PEL exist to 23 m from the antenna. Limit

access to the transmitter and tower.

Open/cracked waveguides .......

There is a possibility of very high radiation levels from broken or open waveguides and

the antenna feed horn. Exclude personnel from these areas and check waveguide portion

of this system periodically for breaks or cracks, and replace any suspect waveguide.

Other.................................

Consult the equipment Technical Manual for other operator and/or maintenance hazards.

Provide detailed SOPs for maintenance personnel.

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