AIM Text
- PAR is designed for use as a landing aid rather than an aid for sequencing and spacing aircraft. PAR equipment may be used as a primary landing aid (See Chapter 5, Air Traffic Procedures, for additional information), or it may be used to monitor other types of approaches. It is designed to display range, azimuth, and elevation information.
- Two antennas are used in the PAR array, one scanning a vertical plane, and the other scanning horizontally. Since the range is limited to 10 miles, azimuth to 20 degrees, and elevation to 7 degrees, only the final approach area is covered. Each scope is divided into two parts. The upper half presents altitude and distance information, and the lower half presents azimuth and distance.
Source: FAA Aeronautical Information Manual · current edition · paragraph 4-5-4.
The short answer
This AIM section is FAA advisory guidance describing Precision Approach Radar (PAR), a ground-based landing aid rather than a sequencing or spacing tool. It explains that PAR displays range, azimuth, and elevation, supporting the ATC-directed instrument approach procedures pilots may use under 14 CFR Part 91.
Research Notes
Common Questions
What information does a PAR display show the controller?
PAR is designed to display range, azimuth, and elevation information. Each scope is divided into two parts: the upper half presents altitude and distance, and the lower half presents azimuth and distance.
How far out does PAR coverage extend?
Per the AIM, PAR range is limited to 10 miles, azimuth to 20 degrees, and elevation to 7 degrees, so only the final approach area is covered. Two antennas are used — one scanning a vertical plane and the other scanning horizontally.
Is PAR used for sequencing traffic or only for landing?
The AIM states PAR is designed for use as a landing aid rather than an aid for sequencing and spacing aircraft. It may be used as a primary landing aid or to monitor other types of approaches.