Airman Certification Standards
ACS PA.IV.I
Glassy Water Takeoff and Climb (ASES, AMES)
Knowledge
Effects of atmospheric conditions, including wind, on takeoff and climb performance.
Best angle of climb speed (VX) and best rate of climb speed (VY). Private Pilot for Airplane Category ACS (FAA-S-ACS-6C)29
Appropriate airplane configuration.
Appropriate use of glassy water takeoff and climb technique.
Risk Management
Selection of takeoff path based on pilot capability, airplane performance and limitations, and available distance.
Water surface/condition.
Abnormal operations, including planning for:
a. Rejected takeoff
b. Potential engine failure in takeoff/climb phase of flight
Collision hazards.
Low altitude maneuvering, including stall, spin, or controlled flight into terrain (CFIT).
Distractions, task prioritization, loss of situational awareness, or disorientation.
Gear position in an amphibious airplane.
Skill
Complete the appropriate checklist(s).
Make radio calls as appropriate.
Position flight controls and configure the aircraft for the existing conditions.
Clear the area, select appropriate takeoff path considering surface hazards or vessels and surface conditions:
a. Retract the water rudders, as appropriate
b. Advance the throttle smoothly to takeoff power and confirm proper engine and flight instrument indications prior to rotation
Establish and maintain an appropriate planing attitude, directional control, and correct for porpoising, skipping, and increase in water drag.
Avoid excessive water spray on the propeller(s).
Use appropriate techniques to lift seaplane from the water considering surface conditions.
Establish proper attitude/airspeed and accelerate to VY +10/-5 knots during the climb.
Configure the airplane after a positive rate of climb has been verified or in accordance with airplane manufacturer’s instructions.
Maintain VY +10/-5 knots to a safe maneuvering altitude.
Maintain directional control throughout takeoff and climb. Private Pilot for Airplane Category ACS (FAA-S-ACS-6C)30
Retrieved from ecfr.gov on July 17, 2026.