What phrase authorizes a pilot to execute a standard instrument approach procedure for an airport?

The phrase that authorizes a pilot to execute a standard instrument approach procedure for an airport is "Cleared Approach." This phrase is used in air traffic control communications to indicate that the pilot has permission to proceed with the specific approach procedure as outlined in the relevant approach chart. It signals that the controller has reviewed the necessary safety parameters and that it is safe for the pilot to carry out the approach.

This phrase is part of standardized aviation communications and helps ensure clarity and safety in the busy environment of air traffic control. In contrast, other phrases such as "Permission granted," "Go Ahead," or "All Systems Go" are not standard terminology used in this context and do not convey the specific authorization required for an instrument approach. Therefore, "Cleared Approach" is the recognized term that pilots and controllers use to confirm that the pilot can proceed with the approach procedure as planned.