Task IV.L
Rough Water Approach and Landing
To determine the applicant exhibits satisfactory knowledge, risk management, and skills associated with rough water approach and landing.
Note: If a rough 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
Study Notes
Whenever waves or swell are big enough to pound the floats on touchdown — beyond light chop. The goal is to arrive at the lowest safe touchdown speed in a nose-up attitude so the float bows stay above the wave crests and the impact energy is minimized. Speed is the enemy: impact loads grow with the square of speed, so every knot shaved off touchdown matters more here than anywhere (Seaplane Handbook FAA-H-8083-23 ch 6).
- A stabilized, slightly power-on final at the published approach speed (or at most 1.3 Vso, +10/−5 knots, gust factor applied).
- Touchdown: a slightly more nose-up attitude than normal, at minimum speed, timed where possible to contact a crest or the back side of a swell rather than flying into a wave face.
- At contact, close the throttle and hold the attitude with elevator — don't let the nose pitch down into the next wave.
- Let the airplane decelerate off the step with back pressure, accepting the pounding at ever-lower energy. Keep flying it until it's at displacement speed (FAA-H-8083-23 ch 6).
Swell usually wins. Landing into a big swell face can stop the airplane violently or throw it back into the air; landing parallel to the swell (in the trough or along the crest line) with a crosswind correction is generally the better trade, up to my crosswind limit. Small wind-driven chop aligned with the wind is the easy case — straight into it. The decision comes from a proper recon circle: read the swell direction and spacing, the wind (spray off crests, streaks), and pick the compromise heading before descending.
Configured early, on speed, trimmed, with a touch of power retained to control the descent rate to a gentle arrival. Carrying extra speed 'for safety' is exactly backwards on rough water — the ACS stabilized-approach knowledge element is about arriving with minimum excess energy. Gusty conditions: apply the gust factor to approach speed, but the touchdown itself still targets minimum speed and the nose-up attitude.
Triggers: unstable approach, drift I can't kill before touchdown, a boat or debris in the zone, or the surface looking worse than the recon suggested (it happens — spray and shadows read differently up close).
The go-around itself: flown positively — full power, climb attitude, reconfigure with a positive rate.
Bounce cue: a firm early bounce off a wave is also a go-around cue — if the airplane skips back into the air with flying speed, adding power and going around beats riding an uncontrolled second touchdown.
Wing-low sideslip through touchdown, same as land — but the water adds weathervaning as soon as the floats dig in, so I'm ready with rudder as the airplane decelerates. In swell-parallel landings the crosswind is by choice, so I've already confirmed it's within my and the airplane's limits. Wake turbulence from vessels is a real item on busy water: a large boat's wake is effectively a moving swell system across my touchdown zone.
Gear up for water, verbally confirmed on final — the ACS risk element exists because high-workload approaches are where gear mistakes happen, and a wheels-down water touchdown is usually a capsize. After landing in rough water, the workload continues: taxi attitude and speed matter to keep spray out of the prop and waves off the nose, and the docking/beaching plan should already account for the surface conditions.
Official ACS elementsreference
Knowledge5 elements
The applicant demonstrates understanding of:
PA.IV.L.K1A stabilized approach, including energy management concepts.PA.IV.L.K2Effects of atmospheric conditions, including wind, on approach and landing performance.PA.IV.L.K3Wind correction techniques on approach and landing.PA.IV.L.K4When and why rough water techniques are used.PA.IV.L.K5How to perform a proper rough water approach and landing.
Risk Management12 elements
The applicant is able to identify, assess, and mitigate risk associated with:
PA.IV.L.R1Selection of approach path and touchdown area based on pilot capability, airplane performance and limitations, available distance, and wind.PA.IV.L.R2Effects of:PA.IV.L.R2aa. CrosswindPA.IV.L.R2bb. WindshearPA.IV.L.R2cc. TailwindPA.IV.L.R2dd. Wake turbulencePA.IV.L.R2ee. Water surface/conditionPA.IV.L.R3Planning for a go-around and rejected landing.PA.IV.L.R4Collision hazards.PA.IV.L.R5Low altitude maneuvering, including stall, spin, or controlled flight into terrain (CFIT).PA.IV.L.R6Distractions, task prioritization, loss of situational awareness, or disorientation.PA.IV.L.R7Gear position in an amphibious airplane.
Skills10 elements
The applicant exhibits the skill to:
PA.IV.L.S1Complete the appropriate checklist(s).PA.IV.L.S2Make radio calls as appropriate.PA.IV.L.S3Ensure the airplane is aligned with the correct/assigned waterway.PA.IV.L.S4Scan the landing area for traffic and obstructions.PA.IV.L.S5Select and aim for a suitable touchdown point considering the wind conditions, landing surface, and obstructions.PA.IV.L.S6Establish the recommended approach and landing configuration, airspeed, and trim, and adjust pitch attitude and power as required to maintain a stabilized approach.PA.IV.L.S7Maintain manufacturer’s published approach airspeed or in its absence not more than 1.3 VSO, +10/-5 knots with gust factor applied.PA.IV.L.S8Maintain directional control and appropriate crosswind correction throughout the approach and landing.PA.IV.L.S9Make smooth, timely, and correct power and control adjustments to maintain proper pitch attitude and rate of descent to touchdown.PA.IV.L.S10Contact the water in a proper pitch attitude, considering the type of rough water.