It can be used for up to 30 years and Tomahawks that haven't been used come back after 15 years for recertification and upgrades.

它可以使用长30，斧式导弹15后回来进行重新认证和升级。

The airline said the decision to resume using the model came after intense recertification by regulators worldwide.

该航空公司表示，得到全球监管机构严格重新认证后决定恢复使用该机型。

There was always too much distance between an initial in-classroom training and your two year recertification.

课堂培训和你两重新认证之间总是有太多距离。

However, this would have significantly changed its aerodynamic profile, forcing pilot recertification and retraining.

然而，这会显着改变其空气动力学特性，迫使飞行员重新认证和再培训。