Rep. Peter DeFazio Peter Anthony DeFazioHouse Democrats to include more aid for airlines in coronavirus package Anxious Democrats amp up pressure for vote on COVID-19 aid Airline CEOs, union leaders implore Congress and the administration to avoid Oct. 1 furloughs MORE (D-Ore.) sent a letter to Transportation Secretary Elaine Chao Elaine Lan ChaoChick-fil-A drops fight for San Antonio airport location Overnight Defense: US marks 19th anniversary of 9/11 attacks | Trump awards Medal of Honor to Army Ranger for hostage rescue mission | Bahrain, Israel normalizing diplomatic ties Trump marks 9/11 with moment of silence on Air Force One, remarks in PA MORE on Friday chastising the Federal Aviation Administration (FAA) for what he said was a lack of transparency over requests for information regarding Boeing’s 737 Max jet.

The letter from DeFazio, the chairman of the House Committee on Transportation and Infrastructure, accused the FAA of slow walking the release of messages and documents as part of the agency's investigation into the design, testing and certification of the Boeing 737 Max, which has come under intense scrutiny after two crashes killed 346 people.

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DeFazio's letter came the same day that 2016 messages surfaced showing two Boeing employees had warned that a new automated system was making the plane hard to control during flight simulations.

“I am deeply troubled by the emails and instant messages between two Boeing employees related to the 737 MAX airplane that the Federal Aviation Administration (FAA) delivered to our Committee today. These messages indicate that Boeing withheld damning information from the FAA, which is highly disturbing,” DeFazio wrote to Chao.

He went on to request the Transportation Department immediately send unredacted email exchanges between employees to his committee, saying it is “unacceptable” that his panel is just now finding out about the messages.

The messages between the employees raised eyebrows because of the blunt assessment of their concerns over the jet’s systems.

“It’s running rampant in the sim,” a pilot reportedly wrote in a message to a colleague, referencing the automated system. The pilot added that while he wasn't great at flying, the system was "egregious."

The Boeing 737 Max has been grounded since March, and the FAA has maintained that there is no “prescribed timeline" for returning it to passenger service.

“As I have said repeatedly throughout the course of my Committee’s investigation, it is imperative that we get answers as to what went wrong, resulting in the two crashes and the deaths of 346 people. On behalf of the victims and their loved ones, as well as the entire flying public, safety must always be the priority. I expect your full cooperation going forward,” DeFazio wrote.