By the end of that March, the engineers and test pilots had arrived at a solution. Again—all but unavoidably at this late stage—the answer would be the software. They would expand MCAS to cover low speeds as well as high. It had the benefit, once more, of being cheap. “All changes are minimal / low collateral damage, therefore no additional flight testing,” one memo said. The same day Leverkuhn and Teal approved the plan, Forkner emailed the FAA’s Klein for permission to delete MCAS from the flight manual because it “only operates WAY outside of the normal operating envelope.” Still focused on
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