Rules of the Air Article 76
An IFR flight operating outside controlled airspace but within or into areas, or along routes, designated by the appropriate ATS authority shall maintain an air-ground voice communication watch on the appropriate communication channel and establish two-way communication, as necessary, with the air traffic services unit providing flight information service.
中文原文 飛航規則第76條
管制空域外儀器飛航之航空器，於航管單位指定之區域內、進入航管指定區域或沿指定航線飛航時，應持續守聽適當之陸空語音無線電頻率，並依規定與相關飛航服務單位建立雙向通信。