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。
Several business aircraft, regional jets and helicopters certified for instrument flight rules 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。
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 instrument flight rules aircraft.
陕西Y-8双涡轮旋浆飞机，安托诺夫An-12反工程版，成为预警机平台，电子情报和仪器飞航规则飞机。
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 instrument flight rules aircraft.
陕西Y-8双涡轮旋浆飞机，安托诺夫An-12反工程版，成为预警机平台，电子情报和仪器飞航规则飞机。
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