Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ER4973 found under Chassis Blade Lh by Pearson Engineering Ltd. The National Stock Number assigned to this part is 2590991745670, and the Federal Supply Class is 2590 Miscellaneous Vehicular Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like ER4973.