Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 542-0-06-20 found under Cover Aircraft Ground Servicing by Drs Mobile Environmental Systems Co. The National Stock Number assigned to this part is 1730015568914, 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 542-0-06-20.