Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7-311820012-15 found under Servocylinder Assem by Mcdonnell Douglas Helicopter. The National Stock Number assigned to this part is 1650012794701, and the Federal Supply Class is 1650 Aircraft Hydraulic Vacuum And De-Icing System Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 7-311820012-15.