Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A51E16142-55 found under Duct Assembly Air Conditioning H by Aero Components Inc. The National Stock Number assigned to this part is 1660003118378, and the Federal Supply Class is 1660 Aircraft Air Conditioning Heating And Pressurizing Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A51E16142-55.