AI.II.B.K7FAA-S-ACS-25 · Nov 2023Knowledge
Situations that create the greatest collision risk.
Situations that create the greatest collision risk.
Bottom line
Pilots of all experience levels were involved in midair collisions, from pilots on their first solo, to 20,000 hour veterans.
Key numbers
| Number | What it means |
|---|---|
| below 1,000 feet (vast majority of studied midair collision accidents, at or near nontowered airports) | Altitude |
| greater than 3 miles (most collisions, in daylight) | Visibility |
| 37 percent of the accidents in the study | Instructors onboard |
| not exceed 10°, observed for at least 1 second | Scan movement |
FAA references
- AIH ch. 9 (p. 9-11) — FAA-H-8083-9B
- PHAK ch. 14 (p. 14-28) — FAA-H-8083-25C (2023)
- AIM 4-4-15 (Use of Visual Clearing Procedures and Scanning Techniques) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
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