Stores more than 40 hours of instrument readings.

存储40小时以上的仪表读数。

youdao

An operational check of each part or system operated by the crew while in flight to establish that, during flight, instrument readings are within normal range.

当飞行时飞行员可以操纵的每一个系统或部件都要进行操纵，以确定量产飞机与原型机有着相同的性能；在飞行期间，仪表读数要在正常范围之内。

youdao

When specified, measurement speed is usually stated as a specific number of readings per second for given instrument operating conditions.

仪器的测量速度常常表达为在给定的仪器工作条件下每秒钟内的读数数目。

youdao

That first version was slightly larger than an adult hand but capable of recording some four hours of cockpit conversation and instrument readings.

BBC: Black box: Key to investigations