In October 1970, Military Airlift Command submitted a requirement for fuel tank nitrogen-inerting and fire-fighting capabilities for the C-5A aircraft. During 1971, the necessary studies were completed and a directive was issued to incorporate a fire protection system in the C-5A force. Parker-Hannifin Corp. was awarded a contract to design and produce the system. Component, simulator, flight verification, and flight service evaluation testing were all completed successfully. Production system installation is now in progress.