Last year the U.S. Federal Aviation Administration certified the Terrafugia Transition as airworthy.

去年，美国联邦航空管理拉弗吉亚汽车颁发了适航证。

And if it's airworthy, the aircraft is safe.

如果机是适航，那么它就是安全。

An airplane undergoes a number of key  checks before a flight, so a technician needs to provide airworthy approval to the pilots  before they are cleared to commence operations.

机在行前要进行多项关键检查，因此技术人员需要在行员获准开始运营之前向他们提供适航许可。