Pilots must rely on visual flight rules that are often referred to as' see and avoid. '.

飞行员必须依靠常被称为“看到并避开”的目视飞行规则。

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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。

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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。

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But aircraft operating under "visual flight rules" still are prohibited from flying within 25 nautical miles of New York and Washington.

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And news reporting aircraft, traffic planes and helicopters, and airships and blimps operating under visual flight rules continue to be grounded.

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The ban applies to private planes whose pilots do not file flight plans and who rely on visual flight rules (VFR).

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