Boeing built its 737 MAX passenger jet without safeguards the US military required for a similar flight control system on a different Boeing-made plane, a source with knowledge of the MAX system told CNN.
The MCAS system on the 737 MAX, which Boeing has redesigned after two fatal MAX crashes that killed 346 people, is similar to a system Boeing had previously developed for the KC-46 military refueling tanker. The military version was designed to receive information from multiple sensors and was limited in forcing the nose of the plane down to prevent the pilot from losing control of the plane. But when Boeing built its new 737 Max passenger plane, it did not include the same safeguards.
However, the architecture, implementation, and pilot interface of the KC-46 tanker MCAS are different than that of the 737 MAX. The systems are not directly comparable," the company said in a statement. The Boeing tanker is a version of the 767 jet modified to carry fewer passengers but a large amount of cargo and 210,000 pounds of fuel, according to a company fact sheet.
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