Air Search Radar that rotates in excess of ______ RPM are the only acceptable radars for an ASR approach.

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Multiple Choice

Air Search Radar that rotates in excess of ______ RPM are the only acceptable radars for an ASR approach.

A fast azimuth update rate is essential for an ASR approach. The radar’s rotation speed determines how often the full 360° sweep is completed, which in turn sets how quickly targets are refreshed and tracked as aircraft come in on final approach. If the radar rotates too slowly, gaps can appear in coverage and timing for vectors and guidance can degrade. Radars that rotate in excess of seven revolutions per minute meet the minimum requirement, providing a sufficiently frequent update to reliably monitor an approaching aircraft. That’s why the threshold is seven; any higher rotation speed is also acceptable. Slower radars—those at or below that lower limit—do not provide adequate update rates for ASR approaches.

A fast azimuth update rate is essential for an ASR approach. The radar’s rotation speed determines how often the full 360° sweep is completed, which in turn sets how quickly targets are refreshed and tracked as aircraft come in on final approach. If the radar rotates too slowly, gaps can appear in coverage and timing for vectors and guidance can degrade.

Radars that rotate in excess of seven revolutions per minute meet the minimum requirement, providing a sufficiently frequent update to reliably monitor an approaching aircraft. That’s why the threshold is seven; any higher rotation speed is also acceptable. Slower radars—those at or below that lower limit—do not provide adequate update rates for ASR approaches.

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