A civil aircraft performing instrumentflight shall observe instrumentflightrules.
进行仪表飞行的民用航空器,应当遵守仪表飞行规则。
2
Several business aircraft, regional jets and helicopters certified for instrumentflightrules are included in this certification.
这次论证包括根据仪器飞行规则所鉴定的几架商业飞机、地域性飞机和直升机。
3
The Shaanxi Y-8 twin-turboprop, reverse-engineered from the Antonov An-12, is the platform for the development of airborne early warning, electronic intelligence and instrumentflightrules aircraft.