Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PSA 99186-4-6-4 found under Adapter Pitot Test by Nav Aids Ltd. The National Stock Number assigned to this part is 4920013793619, 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 PSA 99186-4-6-4.