Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3W21631-105 found under Cover Access Aircraft by Duncan Industries Inc. The National Stock Number assigned to this part is 1560011469401, 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 3W21631-105.