Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 56-4532-2421 found under Control Assembly Pu by Acco Babcock Inc. The National Stock Number assigned to this part is 3040010683063, 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 56-4532-2421.