The U.S. Department of Defense created the National Stock Number system in order to create a uniform naming system for all the components that are sourced, stocked, and procured within the federal supply system. NSNs are 13 digit serial numbers that classify and describe an item. Within the NSN are the smaller classification numbers, Federal Supply Group, Federal Supply Class, country code, and National Item Identification Number. Typically in the format, XXXX-XX-XXXXXXX, the first two digits of the NSN are the Federal Supply Group. The following two digits are the Federal Supply Class. The FSG and the FSC can be referenced in the Department of Defense’s H2 handbook. FSG 15: Aircraft and Airframe Structural Components is a popular FSG. We stock parts under FSG 15 and the following FSCs:
FSC 1510 classifies aircraft fixed wings that are on a completed aircraft and not end items, attachments, and parts, which are put into their own category. 1520 is the rotary wing on the aircraft and includes helicopters but excludes the assemblies or accessories. In structural components 1540 stands for gliders, this can even me a motorized glider. The number 1550 stands for drones, this includes drones that are created specifically for targets, missile evaluation, training, and photographic reconnaissance. But excludes anything that was converted into drone use like guided missiles and piloted aircraft.
1560 describes the airframe structural components like fabricated system parts that are attached to aircraft like ribs, spars, bulkheads, and stabilizers. Some examples of these are trim tabs, flight control surfaces and external auxiliary fuel tanks. Helicopter rotor brake system components and aircraft lose equipment are excluded in class 1560.
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