What VFR code should be used for operations in restricted areas?

In aviation, a VFR (Visual Flight Rules) code is a discrete transponder code used by pilots to communicate their flight status to air traffic control and enhance situational awareness. When operating in restricted areas, pilots are required to use specific codes assigned for military training routes, restricted areas, and other special use airspace.

The correct code, which is 7777, is designated specifically for operational use in restricted areas. This code alerts air traffic control that an aircraft is operating in a designated restricted area, where specific rules and permissions apply. It enables efficient management of air traffic within these sensitive zones, ensuring that pilots are aware of potential hazards and coordinating appropriately.

The other codes listed are used for different purposes in flight operations. For example, 1200 is the standard VFR code used in uncontrolled airspace, while 7600 is used to indicate a radio communication failure. The code 4000 does not have a standard designation in this context. Therefore, using 7777 is crucial for maintaining safety and proper communication when operating in restricted airspace.