Wake turbulence between the two aircraft as well as engine performance and flight control responsiveness in the stratosphere were evaluated.

两架飞机之间的尾流以及在平流层飞行时的发动机性能和飞行控制响应都进行了评估。

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During emissions testing, the cars' pollution controls systems were turned on, curbing toxic emissions at the cost of engine performance.

在排放检测中，车辆的污染控制系统会被打开，遏制发动机性能，削减有毒物质的排放。

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Why do we fail to see that just like with an awesome car – if we want awesome engine performance, we must put in the best quality gas we can find…

为什么我们不会认识到这样一个问题，就如一辆好车——如果我们奢求强劲的动力那么我们必须为它注入我们所能找到的质量极佳的汽油。。。。

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However, the two other black boxes - which record over a hundred flight parameters, including engine performance - did work.

BBC: Ukrainian, Russian papers assess plane crashes

Consumers not only enjoy less flight delays due to engine issues, but are safer as technicians have optimal insight into engine performance.

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The telemetry used in civil aviation transmits data on engine performance and the behaviour of other systems back to base while the plane is in the air.

ECONOMIST: Vehicle telemetry