AA.III.D.S6
Glassy Water Approach and Landing (ASES, AMES)
What does AA.III.D.S6 mean?
Maintain a stabilized approach and recommended airspeed, ±5 knots..
- Area of Operation
- III. Takeoffs and Landings
- Task
- D. Glassy Water Approach and Landing (ASES, AMES)
- Element type
- A Skill element — something you must physically demonstrate to your examiner on the practical test (checkride), not the written.
What you need to know
Glassy water robs you of the visual cues you normally use to judge height and closure rate, since there's no texture or wave pattern to reveal the surface—this is the core hazard, and it's a classic setup for an undetected high sink rate or CFIT if you try to judge height by looking straight down at the water. The fix is to establish a stabilized, constant-attitude, constant-power descent (using a known pitch/power/airspeed combination) referenced to something with visual texture like shoreline, trees, or a fixed known descent angle, and let the airplane settle onto the water rather than trying to flare based on your own height perception. Before touchdown, confirm gear is properly configured (up for a water landing in an amphibian, since landing gear-down on water is catastrophic), water rudders retracted, and checklists/briefings complete, while staying alert for glare-hidden hazards like logs, boats, or wildlife on the surface. Throughout, prioritize flying the stabilized approach and maintaining situational awareness over any distraction, and be ready to execute a prompt go-around if the sink rate, configuration, or surface picture isn't right.
Why students miss this
Students often think glassy water landings are flown by referencing the water surface itself, but on truly glassy water there are no visual cues for height above the surface at all, so the whole point is flying a constant, predetermined pitch and power combination down to touchdown rather than trying to 'see' the flare point. The other common trap is forgetting that this is fundamentally a gear-configuration and CFIT-avoidance problem — on amphibious floats, landing with the wheels extended on water is catastrophic, so questions often hinge on gear position and low-altitude control right when disorientation risk is highest.
Focus on: Focus on the concept that a glassy water landing is a committed, power-on descent at a fixed attitude and rate to touchdown, with no attempt to judge height visually near the surface, combined with rock-solid gear-position and checklist discipline for amphibious aircraft.
Drill this area until it sticks
AA.III.D.S6 came from a question you missed on the FAA Airline Transport Pilot Multiengine Airplane knowledge test. Drill ACS-aligned practice questions with AI explanations and the cited FAA handbook reference behind every answer — free to start.
Missing it isn't a verdict on you — it's a sign your prep skipped the why behind it. Memorizing answer letters is exactly what leaves gaps like this. Here, every answer explains the reasoning and cites the FAA source it comes from, so the concept holds on test day and at the checkride oral.
Related ACS codes in D. Glassy Water Approach and Landing (ASES, AMES)
Other elements the FAA tests under this same Task — review them together.
- AA.III.D.R1Selection of the approach path and touchdown area based on aircraft limitations, available dist…
- AA.III.D.R2Go-around/rejected landing.
- AA.III.D.R3Collision hazards.
- AA.III.D.R4Low altitude maneuvering, including stall, spin, or controlled flight into terrain (CFIT).
- AA.III.D.R5Distractions, task prioritization, loss of situational awareness, or disorientation.
- AA.III.D.R6Gear position in an amphibious airplane.
- AA.III.D.S1Coordinate with crew, if applicable, and complete the appropriate checklist(s).
- AA.III.D.S2Make radio calls as appropriate.
+ 6 more elements in this Task.
Common question
Why can't pilots just judge their height above glassy water visually like a normal landing?
When water is perfectly smooth it acts almost like a mirror with no texture, waves, or shadows, so the eyes have no reliable cues for depth perception or closure rate, which is why pilots instead rely on a stabilized, pre-set descent profile all the way to the surface.
What is an FAA ACS code?
The FAA's Airman Certification Standards (ACS) break each certificate into Areas of Operation, Tasks, and specific Knowledge (K), Risk Management (R), and Skill (S) elements. Every knowledge-test question maps to one code like AA.III.D.S6. When you miss a question, your Airman Knowledge Test Report lists its code so you know exactly what to review.
Have a whole list of codes from your report? Paste them all into our free ACS code lookup to see every weak area at once — or browse the aviation glossary for plain-English definitions.