This paper introduces a method and the result by the use of the regression analysis method to establish helicopter group weight formulae.

本文介绍了利用回归分析法建立直升机部件重量公式的方法和结果，并用子样外的几种中、小型直升机作了校核验算。

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This paper introduces a method and the result by the use of the regression analysis method to establish helicopter group weight formulae. A check has been made using some helicopters except samples.

本文介绍了利用回归分析法建立直升机部件重量公式的方法和结果，并用子样外的几种中、小型直升机作了校核验算。

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This helicopter is used by the flight group "Berkuts" (golden eagles) that performs difficult flights on military helicopters.

“金雕”飞行队用这架直升机做高难度飞行表演。

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Monday, a 30-strong Apache helicopter group was met with a "wall of gunfire" near Karbala, and several choppers were hit.

CNN: Euphrates battle may be biggest so far

Bob Keiller, chairman of the Helicopter Task Group, said they were keen to listen to anyone who could help safety.

BBC: Call for helicopter safety summit

The move to allow some aircraft to fly again was agreed at a meeting of the oil and gas industry's Helicopter Safety Steering Group in Aberdeen on Thursday.

BBC: Nine Super Puma helicopters flying again after ditching