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-C27-

POTENTIAL IMPROVEMENTS

IMPROVEMENT          COMMENTS
1. SPLIT-S           • KSC RETURN FOR EARLY 2/3
                     SSME'S OUT
                     - FLT SW CODE CHANGES
                     - ENGINEERING ANALYSIS
2. BAILOUT           • CREW BAILOUT DURING GLIDING
                     FLIGHT
                     - HARDWARE HATCH MODIFICATIONS
                     - CREW PROCEDURES
3. SRB THRUST        • IMPROVED SEPARATION 
TERMINATION          POTENTIAL
                     - MAJOR HARDWARE MODIFICATION
                     WITH RISKS
                     - EXTENSIVE ANALYSIS
                     - WIND TUNNEL TESTS

4. AUTOMATIC CONTINGENCY
ABORTS THROUGH GLIDING FLIGHT

Figure C9 Potential Improvements