Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PL9904A9000-1 REV A ITEM NO. 42 found under Lens Light by L 3 Communications Westwood. The National Stock Number assigned to this part is 6210015254256, and the Federal Supply Class is 6210 Indoor And Outdoor Electrical Lighting Fixtures. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PL9904A9000-1 REV A ITEM NO. 42.