This probably sounds like a silly question, but I was watching floatplanes land on Lake Union, Seattle, and it got me wondering whether a plane that touches down onto water is still talked about as "landing" in aviation parlance.
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Yes. One 'official' example is from the FAA's test standards for land and seaplanes, which includes these tasks for seaplanes:
Task H: Glassy Water Approach and Landing
Task J: Rough Water Approach and Landing
The FAA's Seaplane, Skiplane, and Float/Ski Equipped Helicopter Operations Handbook also uses it; Chapter 6 is called "Seaplane Operations - Landings".
Interestingly, the word "landing" itself isn't defined in the FAA's glossary or in 14 CFR 1.1 (the US air regulations general definitions). Presumably it's considered to be too 'obvious' to require a definition.
Not in French it isn't. French for landing is 'aterrir' which roughly translates to 'return to the land'. Using this verb for a sea 'landing' would sound silly to them so they use 'amerrir' which means 'return to the sea' (Mer being French for sea, terre is French for ground). A landing in the Moon would be 'alunir'.
This interesting fact was mentioned by the instructor on my French audio course.
No. ICAO defines a landing like this:
From the beginning of the landing flare until aircraft exits the landing runway, comes to a stop on the runway, or when power is applied for takeoff in the case of a touch-and-go landing.
And a runway like this:
A defined rectangular area on a land aerodrome prepared for the landing and take-off of aircraft
Wikipedia suggests that "landing" on water is referred to as "alighting"