If the autopilot fails before entering RVSM airspace, what is the pilot’s immediate action?

The immediate action of notifying the controlling agency or ATC as soon as possible is crucial because it ensures that air traffic control is aware of the aircraft's change in operational capabilities. In RVSM (Reduced Vertical Separation Minimum) airspace, aircraft are required to maintain specific altitudes with strict vertical separation to ensure safe operations among multiple aircraft. A failure of the autopilot can affect the ability to maintain altitude precisely, which is a critical requirement in this airspace.

By informing ATC, the pilot can receive guidance on how to proceed safely. This communication allows for potential re-routing, altitude adjustments, or other necessary measures that may be required to ensure safety and compliance with regulations. Additionally, monitoring and managing expectations with air traffic control helps maintain overall situational awareness for both the pilot and ATC.

In contrast, continuing operations without notifying ATC could lead to dangerous situations, as the aircraft might unintentionally enter RVSM airspace without the required ability to maintain altitude reliably. This could also lead to conflicts with other aircraft that are operating under those strict vertical separation rules. Therefore, immediate communication regarding the autopilot failure is essential for safety and effective air traffic management.