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CA.VI.A.K4aFAA-S-ACS-7B · Nov 2023Knowledge

a. Route

ACS element text (the applicant demonstrates understanding of)

Selection of appropriate: a. Route

Bottom line

A pilot's choice of emergency landing sites is governed by the route selected during preflight planning, the height above the ground when the emergency occurs, and excess airspeed. Plan an alternative airport for every 25–30 nautical mile segment of your route.

Key numbers

Key numbers for a. Route
NumberWhat it means
one alternative airport per 25–30 NM route segmentAlt airports

FAA references

  1. AFH ch. 18 (p. 18-4) — FAA-H-8083-3C
  2. PHAK ch. 2 (p. 2-18) — FAA-H-8083-25C (2023)
  3. RMH ch. 3 (p. 3-15) — FAA-H-8083-2A
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