Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4F73128-103A found under Drum Extension Ladder by K And K Precision Manufacturing Inc. The National Stock Number assigned to this part is 1560004842049, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4F73128-103A.