Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BULLETIN B171A 5AC11.5A found under Cylinder Assembly Actuating Line by Sheffer Corp. The National Stock Number assigned to this part is 3040012289662, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BULLETIN B171A 5AC11.5A.