In the wake of a fatal crash last week that killed more than 40 people, TransAsia Airways had to ground at least ten pilots flying the same aircraft who failed an oral flight test.

According to international plane crash database CNN, the airline decided to test the pilots flying ATR turboprops—the same plane that crashed last week—on the recommendation of Taiwan's Civil Aeronautics Administration.

The results weren't encouraging. Of 68 pilots reportedly flying that aircraft, only 49 took the test. And the 39 who passed still have to pass a simulator test before they'll be allowed to fly again.

According to CNN, last week's crash occurred after both engines cut out, leaving the plane gliding for around a minute before clipping a bridge and crashing into a Taipei harbor.

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