For radar approaches, an acceptable Air Search Radar must rotate in excess of how many RPMs?

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Multiple Choice

For radar approaches, an acceptable Air Search Radar must rotate in excess of how many RPMs?

The main idea here is the minimum rotation speed required for an Air Search Radar used in radar approaches. The radar needs to refresh azimuth information often enough to reliably detect and track an approaching aircraft as it moves through the terminal area. Rotation speed directly sets how frequently bearing updates are produced. Seven revolutions per minute represents the minimum pace that still gives timely updates without over-stressing the equipment. At seven RPM, the radar completes a full sweep roughly every 8.5 seconds, which provides a practical balance between keeping coverage current and reducing wear on the mechanism. If it were slower, like five RPM, you'd have about a 12-second gap between sweeps, which can lead to missed or delayed detections during the critical approach phase. Faster speeds (nine or twelve RPM) offer more frequent updates but aren’t required by the standard for this scenario—the question is asking for the minimum acceptable rate, which is seven RPMs.

The main idea here is the minimum rotation speed required for an Air Search Radar used in radar approaches. The radar needs to refresh azimuth information often enough to reliably detect and track an approaching aircraft as it moves through the terminal area. Rotation speed directly sets how frequently bearing updates are produced.

Seven revolutions per minute represents the minimum pace that still gives timely updates without over-stressing the equipment. At seven RPM, the radar completes a full sweep roughly every 8.5 seconds, which provides a practical balance between keeping coverage current and reducing wear on the mechanism. If it were slower, like five RPM, you'd have about a 12-second gap between sweeps, which can lead to missed or delayed detections during the critical approach phase. Faster speeds (nine or twelve RPM) offer more frequent updates but aren’t required by the standard for this scenario—the question is asking for the minimum acceptable rate, which is seven RPMs.

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