Task IV.I
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.
References: AIM; 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. This Task applies to ASES and AMES applicants only. If a glassy water condition does not exist, you will be evaluated by simulating the Task (ACS Task IV.I note).
VY ±5 knots is the tolerance throughout the climb — accelerate to it during the climb (CA.IV.I.S9) and maintain it to a safe maneuvering altitude (CA.IV.I.S11). Private tolerance: +10/−5 at both points.
Two reasons (FAA-H-8083-23 ch. 4).
Drag: the smoothness increases drag — it can feel like suction between the water and the floats. A little surface roughness helps by introducing turbulence and air bubbles between the water and the float bottoms; that intermittent contact at the moment of liftoff cuts drag while still producing some hydrodynamic lift. Glassy water maintains a continuous drag force instead.
Visual cues: once airborne, the lack of visual cues to height above the water creates a potentially dangerous situation unless a positive rate of climb is maintained.
Break the water's grip on one float: apply enough aileron pressure to lift one float just out of the water and let the seaplane accelerate on the step of the other float until liftoff. Allow the seaplane to turn slightly in the direction the aileron is held, rather than holding opposite rudder to keep it straight — that eliminates considerable aerodynamic drag and aids acceleration (FAA-H-8083-23 ch. 4).
Caution: do not lift the wing so much that the opposite wing contacts the water — that has serious consequences.
Establish a positive rate of climb to prevent inadvertently flying back into the water (FAA-H-8083-23 ch. 4). With no surface texture there is no reliable visual height reference, so a shallow settle is invisible until it is a water contact. This is the same illusion that makes glassy water landings dangerous, working against you in the other direction.
Yes — roughen it yourself. Taxi around in a circle; the wake spreads and reflects from shorelines, creating a slightly rougher surface that provides some visual depth and helps the floats break free during the takeoff run (FAA-H-8083-23 ch. 4).
Yes, if conditions are not too excessive. Heavier loading means the floats sink deeper at rest, which wets more surface area and increases water drag, so the seaplane may sit in a plowing position at full power without developing enough hydrodynamic lift to reach the step. The handbook's rocking technique (FAA-H-8083-23 ch. 4):
- With full back elevator, once the nose reaches its highest point in the plowing position, decrease back pressure somewhat — the nose drops if you are near the step.
- After a few seconds the nose starts to rise; at that instant reinforce the rise with firm back pressure.
- Repeat. Each cycle gains height and speed.
- Then push the elevator well forward and hold it; the seaplane flattens onto the step, and the controls can be eased to neutral.
The careful pilot always plans ahead and considers the possibility of aborting the takeoff (CA.IV.I.R3a).
- Retract the water rudders as appropriate (CA.IV.I.S4a)
- Advance the throttle smoothly to takeoff power and confirm proper engine and flight instrument indications prior to rotation (CA.IV.I.S4b)
- Establish and maintain an appropriate planing attitude and directional control, correcting for porpoising, skipping, and increased water drag (CA.IV.I.S6)
- Avoid excessive water spray on the propeller (CA.IV.I.S7)
Gear position. The ACS lists it as a discrete risk element for every glassy and rough water Task. Landing gear extended on a water takeoff or landing flips the airplane. The check is a positive, verbalized confirmation of gear position against the surface you are operating on — every time, both directions.
Official ACS elementsreference
Knowledge4 elements
The applicant demonstrates understanding of:
CA.IV.I.K1Effects of atmospheric conditions, including wind, on takeoff and climb performance.CA.IV.I.K2Best angle of climb speed (VX) and best rate of climb speed (VY).CA.IV.I.K3Appropriate airplane configuration.CA.IV.I.K4Appropriate use of glassy water takeoff and climb technique.
Risk Management9 elements
The applicant is able to identify, assess, and mitigate risk associated with:
CA.IV.I.R1Selection of takeoff path based on pilot capability, airplane performance and limitations, and available distance.CA.IV.I.R2Water surface/condition.CA.IV.I.R3Abnormal operations, including planning for:CA.IV.I.R3aRejected takeoffCA.IV.I.R3bPotential engine failure in takeoff/climb phase of flightCA.IV.I.R4Collision hazards.CA.IV.I.R5Low altitude maneuvering, including stall, spin, or controlled flight into terrain (CFIT).CA.IV.I.R6Distractions, task prioritization, loss of situational awareness, or disorientation.CA.IV.I.R7Gear position in an amphibious airplane.
Skills14 elements
The applicant exhibits the skill to:
CA.IV.I.S1Complete the appropriate checklist(s).CA.IV.I.S2Make radio calls as appropriate.CA.IV.I.S3Position flight controls and configure the aircraft for the existing conditions.CA.IV.I.S4Clear the area, select appropriate takeoff path considering surface hazards or vessels and surface conditions.CA.IV.I.S4aRetract the water rudders, as appropriateCA.IV.I.S4bAdvance the throttle smoothly to takeoff power and confirm proper engine and flight instrument indications prior to rotationCA.IV.I.S5[Archived]CA.IV.I.S6Establish and maintain an appropriate planing attitude, directional control, and correct for porpoising, skipping, and increase in water drag.CA.IV.I.S7Avoid excessive water spray on the propeller(s).CA.IV.I.S8Use appropriate techniques to lift seaplane from the water considering surface conditions.CA.IV.I.S9Establish proper attitude/airspeed and accelerate to VY ±5 knots during the climb.CA.IV.I.S10Configure the airplane after a positive rate of climb has been verified or in accordance with airplane manufacturer’s instructions.CA.IV.I.S11Maintain VY ±5 knots to a safe maneuvering altitude.CA.IV.I.S12Maintain directional control throughout takeoff and climb.