What condition requires an aircraft on a north recovery to contact Pensacola Approach?

An aircraft on a north recovery must contact Pensacola Approach when it is over the southern powerline due to procedural requirements established for safe and efficient air traffic control operations. This position acts as a reference point in the airspace, ensuring that aircraft maintain proper separation from one another and remain clear of potential hazards. By making contact at this point, pilots can receive any necessary instructions from air traffic control that pertain to their approach or any other airspace considerations.

The other options do not signify a requirement to contact Pensacola Approach, as they either represent positions or altitudes that do not correspond with the specific protocol set for communication during the recovery procedure. Knowing when and where to communicate with air traffic control is crucial for maintaining order in the busy airspace around Naval Air Station Whiting Field.