Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1 1520 238 50 16 found under Modification Kit Ai by Boeing Company The. The National Stock Number assigned to this part is 1560013624948, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1 1520 238 50 16.