The pilot has since left Boeing.
The 737 Max has been grounded worldwide since March after two fatal crashes killed 356 people.
"We have received hundreds of thousands of pages of documents from Boeing, but not this one". We will continue to cooperate with the Committee as it continues its investigation. He called it a smoking gun of Boeing wrongdoing.
In his terse, three-sentence letter to the Boeing CEO, Dickson wrote, "I expect your explanation immediately regarding the content of this document and Boeing's delay in disclosing the document to its safety regulator".
"I understand that Boeing discovered the document in its files months".
Separately, the US Senate Committee on Commerce, Science and Transportation confirmed it will question Muilenburg at an October 29 hearing, one day before a US House of Representatives panel is scheduled to question him.
The messages are between the MAX's then-chief technical pilot and another Boeing pilot, the sources said, and raised questions about the MCAS's performance in the simulator.
According to Reuters, the FAA said on Friday the messages were "concerning" and that it was working to "determine what action is appropriate".
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"If you read the whole chat, it is obvious that there was no 'lie, '" he said. "And based on everything he knew, he absolutely thought this plane was safe".
Boeing's stock price slid as much as 4% Friday on a report that the airplane maker may have misled the Federal Aviation Administration in 2016 regarding the 737 Max.
Families of the Indonesia crash victims are in settlement talks with Boeing, while the loved ones of the Ethiopian crash victims are pursuing a trial, CNBC reported Thursday. Pilots were unable to regain control.
Before crashes in Indonesia and Ethiopia, MCAS was activated by a faulty sensor and pushed the nose of each plane down. "Things have just tilted very, very heavily in terms of Boeing and deliberate concealment".
Multiple revelations about software problems and procedural flaws over the past six months have raised doubts that the planes would ever come back into service, as both passengers and pilots appear to have lost all confidence in the model.
Boeing issued a statement Friday afternoon, saying that its CEO had called FAA Administrator Dickson to respond to his concerns.
The agency said it was turning over the documents to Congressional investigators.
Shares of Boeing are up about 10% year-to-date.