Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 99520 found under Spring Oven Door by Piasecki Aircraft Corp. The National Stock Number assigned to this part is 5360007846202, and the Federal Supply Class is 5360 Coil Flat Leaf And Wire Springs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 99520.