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CA.IV.A.K1FAA-S-ACS-7B · Nov 2023Knowledge

Effects of atmospheric conditions, including wind, on takeoff and climb performance.

ACS element text (the applicant demonstrates understanding of)

Effects of atmospheric conditions, including wind, on takeoff and climb performance.

Bottom line

The further effects of high temperature and high humidity are cumulative, resulting in an increasing high density altitude condition.

Key numbers

Key numbers for Effects of atmospheric conditions, including wind, on takeoff and climb performance.
NumberWhat it means
approximately 2,000 feet at 5,000 feet operational altitude for an airplane requiring 1,000 feet at sea level under standard atmospheric conditionsTakeoff distance
35 miles per hour at the proposed altitude for light aircraftWinds aloft limit
70 percent of lift-off airspeed by the midpoint of the runway, assuming runway length is appropriate for takeoffHalf-way rule
broadcast at airports with elevations of 2,000 feet and higher when the temperature reaches a predetermined levelDA advisory

FAA references

  1. AIM 7-6-7 (Mountain Flying) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  2. AIM 7-6-8 (Use of Runway Half-way Signs at Unimproved Airports) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  3. PHAK ch. 5 (p. 5-12) — FAA-H-8083-25C (2023)
  4. RMH ch. 3 (p. 3-7) — FAA-H-8083-2A
  5. SEA ch. 5 (p. 5-1) — FAA-H-8083-23
  6. RMH ch. 3 (p. 3-6) — FAA-H-8083-2A
  7. PHAK ch. 5 (p. 5-42) — FAA-H-8083-25C (2023)
  8. AFH ch. 9 (p. 9-12) — FAA-H-8083-3C
  9. AFH ch. 12, Operational Procedures (p. 12-5) — FAA-H-8083-3C
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