Final answer:
The Naval Aviation Maintenance Program (NAMP) is the authorized medium for directing modifications or one-time inspections of naval aircraft according to NAVAIRINST 5215.12. It provides guidelines that ensure safe and regulation-compliant maintenance of naval aircraft.
Step-by-step explanation:
The only authorized medium for directing the modification or the accomplishment of one-time inspections of naval aircraft, as per NAVAIRINST 5215.12, is the Naval Aviation Maintenance Program (NAMP). The NAVAIRINST refers to the Naval Air Systems Command Instructions which are a set of guidelines and procedures governing the operations and maintenance of U.S. naval aviation assets. These instructions ensure that aircraft are maintained in a state that is safe for operation and compliant with all regulations.
Regarding the implementation of modification and inspection directives, such actions are typically communicated through specific channels defined by the NAVAIRINST. These may include, but are not limited to, Maintenance Requirement Cards (MRCs), Technical Directives (TDs), or Maintenance Instruction Manuals (MIMs). The process is rigorous to ensure that all safety and performance standards are met and that any changes to aircraft systems do not introduce unforeseen safety risks. In the context of the NAMP, aviation boatswain's mates and other maintenance personnel would reference the most current guidelines to perform tasks like testing the specific gravity of JP-5 fuel, as depicted in Figure 1.12.2.