Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 16B5503-89 found under Cover Access Aircraft by Aerospace And Commerical Technologies. The National Stock Number assigned to this part is 1560014358659, 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 16B5503-89.