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PA.IV.I.R1FAA-S-ACS-6C · Nov 2023Risk management

Selection of takeoff path based on pilot capability, airplane performance and limitatio...

ACS element text (the applicant demonstrates understanding of)

Selection of takeoff path based on pilot capability, airplane performance and limitations, and available distance.

Bottom line

Under these conditions the seaplane may assume a plowing position when full power is applied, but may not develop sufficient hydrodynamic lift to get on the step due to the additional water drag. Even a minor overload may make it impossible for the aircraft to clear an obstacle that normally would not be a problem during takeoff under more favorable conditions. High altitudes, high temperatures, high humidity, and even low barometric pressure can combine to rob the engine and propeller of thrust and the wings of lift.

FAA references

  1. SEA ch. 4 (p. 4-15) — FAA-H-8083-23
  2. AIM 7-6-14 (Flying in Flat Light, Brown Out Conditions, and White Out Conditions) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  3. SEA ch. 4 (p. 4-16) — FAA-H-8083-23
  4. AFH ch. 12, Operational Procedures (p. 12-5) — FAA-H-8083-3C
  5. RMH ch. 3 (p. 3-14) — FAA-H-8083-2A
  6. PHAK ch. 5 (p. 5-42) — FAA-H-8083-25C (2023)
  7. SEA ch. 5 (p. 5-1) — FAA-H-8083-23
  8. PHAK ch. 11 (p. 11-7) — FAA-H-8083-25C (2023)
  9. AFH ch. 18 (p. 18-9) — FAA-H-8083-3C
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