由于油封损坏造成减速机漏油的处理措施是

A. It is a navigation mode that ensure the aircraft follows a desired flight path in the range of navigation signal coverage. or within the capacity limits of the airborne navigation equipment, or a combination of both.
B. It is required NAV performance.
C. It Regulates the system performance requirements of the aircraft flying in the designated airspace or along the ATS route. flight instrumentation procedure