机组在发现导航设备性能变差或失效从而低于导航性能要求时或任何因特殊情况而要求偏离航路时，应通知ATC上述情况? Crews must advise ATC of any deterioration or failure of the navigation equipment below the navigation performance requirement or of any deviation required for a contingency procedure.
A.对 correct
B.错 incorrect
正确答案是A