Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 63-11-1-1 found under Staircase Aircraft Boarding by Celtech Corporation. The National Stock Number assigned to this part is 1730001034819, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 63-11-1-1.