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[i]• 600+ LOX Main Engine Injectors are CRIT 1 components that are manufacturing or fatigue life limited (cracking results) – Cracked LOX Post could allow combustion within injector head and cause main engine failure – Repair consists of pin ( 1 inch long, 0.1 inch dia.) friction-fitted into post to deactivate injector by blocking LOX flow – After pin insertion, vacuum leak checks and engine firing (green run) verify repair • Pin Ejection IFA on STS-93 – 2 LOX posts deactivated with standard pin repair – 1 deactivation pin ejected upon engine start – 3 of 1080 SSME nozzle coolant tubes ruptured – 4.5 lbs/sec leak of H2 (visible on take-off) – Premature MECO (0.15 seconds early) and 16 ft/sec underspeed[/i]
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