Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 400027-022 found under Earphone by Telex Communications Inc. The National Stock Number assigned to this part is 5965013985508, and the Federal Supply Class is 5965 Headsets Handsets Microphones And Speakers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 400027-022.