Task III.C
Glassy Water Takeoff and Climb (ASES, AMES)
To determine the applicant exhibits satisfactory knowledge, risk management, and skills associated with glassy water takeoff and climb.
Note: If a glassy water condition does not exist, the applicant must be evaluated by simulating the Task. See Appendix 3: Aircraft, Equipment, and Operational Requirements & Limitations for information related to this Task.
References: FAA-H-8083-2, FAA-H-8083-3, FAA-H-8083-23, FAA-H-8083-25; POH/AFM
Quick Review
Conversational Q&A — quiz yourself before the oral. Seaplane-class (ASES, AMES) Task; if a glassy water condition doesn't exist on test day, the Task is evaluated by simulating it.
Glassy water works against me in two ways (FAA-H-8083-23 ch. 4):
Increased drag: the smooth surface can feel like suction between the water and the floats, maintaining a continuous drag force that can prevent accelerating the last few knots to lift-off speed. A little surface roughness actually helps break the contact by introducing turbulence and air bubbles under the float bottoms.
No height cues once airborne: the lack of visual cues to height above the water is dangerous unless a positive rate of climb is maintained — I can fly back into the water without ever seeing it coming.
Identical to a normal takeoff until the seaplane is on the step and nearly at flying speed (FAA-H-8083-23 ch. 4). Then, to break the water's grip:
- Apply enough aileron to lift one float just out of the water, and let the airplane continue accelerating on the step of the other float until lift-off
- Allow the seaplane to turn slightly in the direction the aileron is held rather than holding opposite rudder — this eliminates considerable aerodynamic drag
- Don't lift the wing so far that the opposite wing contacts the water
- After lift-off, establish a positive rate of climb to prevent inadvertently flying back into the surface
I rock the seaplane onto the step with timed elevator pressure, if conditions aren't excessive (FAA-H-8083-23 ch. 4):
- From the highest nose-up point of the plow, with full back elevator, decrease back pressure — the nose drops if the seaplane is on the verge of the step.
- When the nose starts back up, reinforce the rise with firm back pressure, and repeat.
- After several cycles the nose rides higher and speed builds; then push the elevator well forward and hold it — the seaplane flattens onto the step, and the controls ease back to neutral.
Why it happens: at maximum weight the floats sink deeper, wetting more surface and adding water drag, so the seaplane may sit in a plowing position without developing enough hydrodynamic lift for the step. The careful pilot always plans for aborting the takeoff (AA.III.C.R2a).
I brief the plan before power comes in — like the abort point, it can't be worked out after the failure:
- Where the usable water ahead is, and what shoreline features could substitute as height references — the ch. 6 illusion mitigations
- That a positive rate of climb is confirmed before anything else — without it I can fly back into an invisible surface (ch. 4)
Glassy water makes that plan uniquely demanding: the handbook's glassy landing technique is flown with power — touchdown attitude, no more than 150 fpm of descent, about 10 knots above stall (FAA-H-8083-23 ch. 6) — and a failed engine takes that option away over a surface with no height cues. That is why the ACS pairs the abort plan with planning for engine failure in the takeoff/climb phase.
Roughen it yourself: taxi around in a circle so your wake spreads and reflects from shorelines, creating a slightly rougher surface that both helps the floats break free during takeoff and provides some visual depth (FAA-H-8083-23 ch. 4).
Beyond the standard crew/checklist/radio items (AA.III.C.S1, S2):
- Water rudders: retracted (S6)
- Power: set and confirm takeoff power (S7), avoiding excessive water spray on the propellers (S8)
- Directional control and attitude: maintain an appropriate planing attitude, correcting for porpoising, skipping, and increases in water drag (S9, S10)
- Lift-off: use appropriate technique considering surface conditions (S11)
- Climb: adjust power and pitch to hold the appropriate climb airspeed/V-speed ±5 knots for each climb segment (S12)
- Flaps: retract after a positive rate of climb is verified, or per manufacturer/operator procedures (S13)
- Noise abatement: as practicable (S14)
Gear position. An amphibious airplane taking off from water must have the wheels retracted — the ACS carries "gear position in an amphibious airplane" as a standing risk element across every seaplane takeoff and landing Task, and the takeoff configuration verification (AA.III.C.S4) is where you prove it. Make gear position an explicit checklist response and callout, not an assumption, every time the surface changes between pavement and water.
Official ACS elementsreference
Knowledge4 elements
The applicant demonstrates understanding of:
AA.III.C.K1Effects of atmospheric conditions, including wind, on takeoff and climb performance.AA.III.C.K2Appropriate power settings and V-speeds for takeoff and climb.AA.III.C.K3Appropriate airplane configuration.AA.III.C.K4Appropriate use of glassy water takeoff and climb technique.
Risk Management8 elements
The applicant is able to identify, assess, and mitigate risk associated with:
AA.III.C.R1Selection of the takeoff path based on aircraft limitations, available distance, surface conditions, and wind.AA.III.C.R2Abnormal operations, including planning for:AA.III.C.R2aRejected takeoffAA.III.C.R2bPotential engine failure in takeoff/climb phase of flightAA.III.C.R3Collision hazards.AA.III.C.R4Low altitude maneuvering, including stall, spin, or controlled flight into terrain (CFIT).AA.III.C.R5Distractions, task prioritization, loss of situational awareness, or disorientation.AA.III.C.R6Gear position in an amphibious airplane.
Skills14 elements
The applicant exhibits the skill to:
AA.III.C.S1Coordinate with crew, if applicable, and complete the appropriate checklist(s) prior to takeoff in a timely manner.AA.III.C.S2Make radio calls as appropriate.AA.III.C.S3Position the flight controls for the existing wind, if applicable.AA.III.C.S4Verify the airplane is configured for takeoff.AA.III.C.S5Clear the area; select appropriate takeoff path considering surface conditions and collision hazards.AA.III.C.S6Retract the water rudders, as appropriate.AA.III.C.S7Set and confirm takeoff power.AA.III.C.S8Avoid excessive water spray on the propeller(s).AA.III.C.S9Maintain directional control throughout takeoff and climb.AA.III.C.S10Establish and maintain an appropriate planing attitude, directional control, and correct for porpoising, skipping, and increase in water drag.AA.III.C.S11Utilize appropriate techniques to lift seaplane from the water considering surface conditions.AA.III.C.S12Adjust power, as appropriate, and establish a pitch attitude to maintain the appropriate climb airspeed/V-speed, ±5 knots for each climb segment.AA.III.C.S13Retract flaps after a positive rate of climb has been verified or in accordance with manufacturer or operator procedures and limitations, as appropriate.AA.III.C.S14Follow noise abatement procedures, as practicable.