Comac is working on an upgrade of the ARJ21, which it will implement following the imminent airworthiness certification of the much-delayed regional jet.  “We have already begun demonstration work and will fully go ahead after the type certificate has been issued,” Comac said. “This [upgrade] will mainly involve reductions in weight and drag. There will also be improvements in the avionics, flight controls and the anti-icing system.” Launched in 2002, the ARJ21 ...


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