Elwell's testimony, first reported by the Seattle Times, could renew questions over the FAA's response to safety concerns about the MAX aircraft after the deadly October 29 crash in Indonesia and another in Ethiopia on March 10, almost seven weeks after Elwell says Boeing submitted its proposed changes.
Southwest said the plane's pilots reported a "performance issue" with an engine shortly after taking off for the California airport, where it was flying to be in short-term storage.
"The crew followed protocol and safely landed back at the airport", the airline said.
The fault on the Boeing Co. jetliner had "absolutely no relation" to the flight-control issue that prompted US regulators to ground all 737 Max aircraft on March 13, said Brandy King, a spokeswoman for Southwest. The only people on board were the pilot and co-pilot. This is the first time both Chao and Elwell will be appearing before Congress since the crash of Ethiopian Airlines Flight 302 earlier this month.
U.S. Transportation Department Inspector General Calvin Scovel disclosed the plan in written testimony ahead of a U.S. Senate panel hearing on Wednesday.
Meanwhile, investigators in Indonesia and Ethiopia continue to examine the wreckage and flight data recorders for causes of the crashes.
In a rejoinder, KQ chairman Michael Joseph said that the publication misquoted him, saying that KQ has not ordered any planes, contrary to what Nation reported.
It was the second fatal crash involving the airplane.
According to a March 13FAA order that grounded all Boeing 737 MAX aircraft in the country, airlines are allowed to fly the planes without any passengers to a base for storage or maintenance.
At the heart of the controversy surrounding the 737 Max is MCAS, the Maneuvering Characteristics Augmentation System.
Goldberg said it was "inexcusable for Boeing to omit this information from the pilot manuals for training".
On Tuesday, a spokesman for Ethiopia's transport ministry, which is leading the investigation in Addis Ababa into the March 10 crash, told Reuters the preliminary crash report would very likely be released this week, though he cautioned "there could be unpredictable things" and declined to give further details.
As they battled the uncooperative and diving plane past year, the pilots on the doomed Lion Air flight attempted a routine maneuver to try and stabilize the plane by triggering a switch near the steering wheel approximately three dozen times, according to a report by Indonesian investigators.
Boeing is still manufacturing the plane - and maintains the aircraft is safe - but is pausing deliveries to customers for the time being.
What caused crashes of Lion Air, Ethiopian Airlines jets?
Engineers have been focusing on addressing problems with the MCAS system, a stall prevention system created to point the nose of the 737 MAX 8 downward if it is in danger of stalling, or losing lift.
The Federal Aviation Administration delegates much of the work of airplane certification to manufacturers such as Boeing under a decades-old process.
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