The inherency frequency and vibratory-type are calculated based on the modal analysis of the whole airframe.

对体框架进行模态分析,求固有频率和振型。

If additional trainer aircraft are needed, the Pentagon plans to redesignate some of its existing rotorcraft rather than buying new airframes.

如果需的训练，五角大楼计划再次指派一些现有的旋翼飞而不是购买新的。

Included in the transaction are three nonflying TP-3A aircraft to used as airframe spares and extra T-56 engines to support the 12 flyable aircraft.

这次交易包括三架不能飞的TP-3A飞进行备用，以及的T-56发动以支持12架可驾驶飞。