AA.II.D.K3
D
What does AA.II.D.K3 mean?
Airport/seaplane base markings, signs, and lights..
- Area of Operation
- II
- Task
- D
- Element type
- A Knowledge element — a fact, concept, or procedure the FAA expects you to know and that the knowledge (written) test draws questions from.
What you need to know
This task covers safely moving your airplane on the surface — whether taxiing on pavement or sailing/taxiing a seaplane on water — using correct references, markings, communications, and lighting. Before moving, you must know how to find current airport or seaplane base information (Chart Supplements, airport diagrams) and brief your route, especially where runway crossings or complex taxi paths are involved, and you must read back and comply with ATC taxi instructions at towered fields or follow self-announce procedures at nontowered ones. For seaplane operations, "sailing" means using wind, engine power, and control surface/flap positioning (rather than water rudders or power alone) to maneuver when docking, beaching, or positioning the aircraft, and choosing the most favorable sailing course means considering wind direction, current, traffic, and obstacles to control drift and heading with minimal engine use. Across all these elements, know how markings/signs/lights differ for day versus night operations and how reduced visibility changes your procedures and required caution.
Why students miss this
Students preparing for the ATP often skim this task because it blends standard land-taxi procedures with seaplane sailing techniques, and they underestimate how much the ACS expects on wind/current-based sailing decisions and non-towered communication procedures. The common trap is treating taxi and sailing as interchangeable concepts, missing that sailing relies on wind and water conditions rather than power and brakes, and that the 'most favorable course' depends on reading environmental cues rather than following a fixed procedure.
Focus on: Study sailing techniques and airport/seaplane base signage, lighting, and communication procedures as distinct skill sets, focusing on how wind and current affect control on the water versus taxi clearances and markings on land.
Drill this area until it sticks
AA.II.D.K3 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
Other elements the FAA tests under this same Task — review them together.
- AA.II.D.K1Current airport/seaplane base aeronautical references and information resources including Chart…
- AA.II.D.K2Taxi instructions/clearances, if applicable.
- AA.II.D.K4Appropriate aircraft lighting for day and night operations.
- AA.II.D.K5Sailing elements and techniques and when sailing should be used.
- AA.II.D.K6Considerations for determining the most favorable sailing course.
- AA.II.D.K7Airport/seaplane base procedures including
- AA.II.D.K7aAppropriate flight deck activities prior to taxi or sailing, including route planning, and coor…
- AA.II.D.K7bCommunications at towered and nontowered seaplane bases
+ 3 more elements in this Task.
Common question
Do ATP applicants really need to know seaplane sailing if they're testing in a landplane?
Yes, the ACS task covers both land and seaplane base operations regardless of the airplane class being flown for the checkride, so examiners can ask conceptual questions about sailing techniques even in a landplane evaluation.
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.II.D.K3. 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.