仪表飞行规则 meaning in English

instrument flight rules
instrument-flight rules

Ifr - instrument flight rules
仪表飞行规则
A civil aircraft performing instrument flight shall observe instrument flight rules
进行仪表飞行的民用航空器，应当遵守仪表飞行规则。
Before the implementation of ifr routes and procedures , helicopter services between hong kong and macau were operated only when weather conditions satisfied the visual flight rules . flights were sometimes delayed or even cancelled due to inclement weather
在仪表飞行规则路线及程序获准采用前，来往港澳之间的直升机只可在天气容许目视飞行的情况下运作，直升机服务偶会因天气恶劣而延迟或取消。
" with the implementation of the ifr procedures , pilots can utilise signals from ground navigation aids and fly along the designated ifr routes even when the visibility precludes visual flights . the regularity of the helicopter service between hong kong and macau is therefore improved , " the spokesman said
他说：仪表飞行规则程序获准使用后，即使能见度低至不可能靠目视飞行，飞行员仍可根据地面导航仪器所发出的信息，以设定的仪表飞行规则路线飞行，令来往港澳之间的直升机服务更有规律。