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 16: Aircraft Components and Accessories We stock parts under FSG 16 and the following FSCs:
Any parts that convert rotary motion into propulsive force
Any parts that assist on the rotary wing motion of any rotorcraft
Any part that supports an aircraft while it is landing or not flying
Any parts that support the movement of an aircraft while it is on the ground
Any parts that make up the components of the aircraft that provide power
Any parts that assist on controlling temperature and climate
The number 1615 classifies helicopter rotor blades, drive mechanisms and components used in rotor blades and helicopter drive mechanisms. Also, those specially designed parts that transmit to the rotary rudder and the rotary wing. 1640 stands for aircraft control cable products, which are wire stands, wire rope, control pulleys, and wire rope. Aircraft air conditioning, heating, and pressurizing equipment like the fixed oxygen system, cabin pressure regulators, cabin supercharging equipment, and air expansion turbines are classified under 1660. Another class in the Aircraft Component and Accessories is class 1680, which is miscellaneous aircraft accessories and components that include control assemblies, ventilators, electric windshield wipers, etc.
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