" 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。
Such research can lead to a new flight procedure design methodology , which copes with these problems and makes strong economical senses . under the guidance of aviation safety , efficiency , regularity and economy , this thesis applies the principle of the instrument flight procedure , firstly , to research the current vor / dme instrument flight procedure , namely the vor / dme instrument flight procedure ( vor / dmf . ifp ) , its holding procedures , departure routes , arrival routes , and approach procedures , cor the terminal airspace 本文在安全、效率、正常和经济的原则下，运用仪表飞行程序设计的思想和原则，首先对在vor / dme导航台上建立仪表进场航线、等待程序、仪表进近程序和仪表离场航线等机场空域内的飞行程序的设计方法进行了研究，总结出不同位置的vor / dme仪表飞行程序的布局形式、适用情况及其优缺点，并首次提出了以vor / dme为基准的封闭圆弧进近程序；其次，研究了基于vor / dme导航台的区域导航飞行程序的设计方法；最后，研究了在现有的vor / dme仪表飞行程序上建立区域导航飞行程序的设计方法。
