Rules of the Air Article 38
A time check shall be obtained from the ATS unit prior to operating a controlled flight and at such other times during the flight as may be necessary.
中文原文 飛航規則第38條
管制飛航於作業前及於飛航中必要時之其他時間，應向飛航服務單位作時間校正。
English translation for reference only; the Chinese text prevails. Not legal advice.