Rules of the Air Article 12
Nothing shall be dropped or sprayed from an aircraft in flight except under conditions prescribed by the CAA and as indicated by relevant information, advice and/or clearance from the appropriate air traffic services unit.
中文原文 飛航規則第12條
航空器在飛航中，不得投擲或噴灑任何物品，但經民航局核准者不在此限；投擲或噴灑時並應經航管單位許可。