Confined Area Takeoff and Maximum Performance Climb (ASES, AMES)

ACS Appendix 3 defines two required scenarios: a takeoff and spiral climb, and a straight-ahead takeoff and climb from a narrow waterway with obstructions at either end. The evaluator must assess both. In multiengine seaplanes or amphibians with VX within 5 knots of VMC, you and the evaluator may brief using VY or the manufacturer's recommendation if more appropriate for the demonstration.

• Rotate and lift off at the appropriate airspeed and accelerate to the recommended obstacle clearance airspeed or VX, using appropriate bank angles to maintain terrain clearance as needed (S11)
• Climb at the recommended airspeed — or absent one, VX, +5/−0 knots — until the obstacle is cleared or the airplane is 50 feet above the surface; where VX is within 5 knots of VMC in a multiengine airplane, VY or the manufacturer's recommendation is acceptable (S12)
• After clearing all obstacles, accelerate to VY ±5 knots (S13)
• Retract flaps and adjust power as needed to maintain VY or the appropriate climb airspeed ±5 knots to a safe maneuvering altitude (S14)

Begin the takeoff run headed downwind, then turn to complete the takeoff into the wind: put the seaplane on the step while downwind, then make a step turn into the wind to finish the takeoff (FAA-H-8083-23 ch. 4). Two cautions apply: during the turn, wind and centrifugal force act in the same direction and could tip the seaplane over, and the water area must permit a wide step turn with winds light enough to attempt it.

Because the same surrounding high terrain that confines the area also blocks the wind, producing a glassy surface — and when combined with high density altitude, conditions can turn dangerous even though the landing was easy (FAA-H-8083-23 ch. 4). Mitigations the handbook lists:

• If the departure path crosses high terrain, circle back over the water after takeoff to gain altitude
• If temperatures rose since landing, re-figure performance for the new density altitude — or wait for cooler morning air
• Consider leaving cargo or passengers behind and making a second trip rather than ending the takeoff in the trees

Density altitude hits a seaplane doubly: high, hot, and humid air robs the engine and propeller of thrust and the wings of lift while water drag still has to be overcome (FAA-H-8083-23 ch. 5).

The same discipline as Task III.I with the geometry tightened: before power comes in, know the point on the water beyond which you can no longer close the throttle and stop in the distance remaining — remembering that FAA-approved landplane thinking doesn't transfer cleanly, since water drag, waves, and current change the stopping picture. The handbook's standing advice applies: the careful seaplane pilot always plans ahead and considers the possibility of aborting the takeoff (FAA-H-8083-23 ch. 4), and the ACS pairs the reject with planning for a potential engine failure in the takeoff/climb phase (R2b) — in a confined area, that plan should include whether a climbing turn back over the water beats straight ahead into terrain.

The full stack from the normal water takeoff, under tighter geometry:

• Checklists and crew coordination in a timely manner (AA.III.G.S1)
• Radio calls (S2)
• Flight controls positioned for the wind (S3)
• Takeoff configuration verified, including gear up in an amphibian (S4, R6)
• Area cleared and takeoff path selected for surface conditions and collision hazards (S5)
• Water rudders retracted (S6)
• Takeoff power set and confirmed (S7)
• Spray kept off the propellers (S8)
• Directional control with wind-drift correction (S9)
• Planing attitude with porpoising/skipping corrections (S10)
• Noise abatement as practicable (S15)