Boeing and CFM International are scrutinizing fuel supplies and the Honeywell-built fuel-control system in the CFM56-7B following a series of thrust-instability events on Boeing 737NG aircraft. Their findings could have broader implications for the Jet A supply chain and fuel-testing regimen if contamination is behind the incidents. “We’re doing a root-cause analysis, looking at the fuel-control unit and the entire fuel supply chain,” says Boeing. “The problem might be fuel-based.” ...

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