観かん測そくヘリコプター

noun

observation helicopter

A helicopter equipped for surveillance, reconnaissance, or data collection, often used in military, meteorological, or scientific contexts.

• 気き象しょう庁ちょうは観かん測そくヘリコプターを使つかって火か山ざんの活かつ動どうを調しらべた。

  The meteorological agency used an observation helicopter to investigate volcanic activity.