QuesTek Innovations has applied its Materials by Design® methodology to computationally design a new high strength corrosion resistant steel, Ferrium® S53, that eliminates the need for toxic cadmium coatings currently used on conventional steels in landing gear systems. S53 exhibits the strength level of 300M steel, yet with corrosion resistance similar to 15-5PH steel. QuesTek is currently in the 3rd year of a certification and test program to qualify S53 for applications on US Air Force aircraft. The program will submit an Aerospace Material Specification in mid-2006 and begin flight-testing in late 2006. Data will be presented from characterization and process studies. Alloy characterization has focused on strength, toughness, corrosion resistance, fatigue, and stress corrosion cracking. Processing studies completed to date include forging, welding, and machining. DARPA “Accelerated Insertion of Materials” techniques are being used to estimate design allowables from the limited data generated for the AMS specification. Plans to generate MMPDS properties will be discussed. Although S53 was developed as a drop-in replacement for 300M in landing gear systems, many additional applications are anticipated for this 290ksi UTS corrosion resistant steel. S53 is currently available for qualification testing in a number of product sizes.