The aircraft manufacturer noted that the report on the details of the doomed flight cited actions by the flight crew that led to the crash. It noted the airline's maintenance work and procedures had failed to fix repeated problems with the aircraft. It also said records on installation and calibration of a key component, an angle-of-attack, or AOA sensor, were incomplete.
The report said erroneous AOA data affected measurements of speed and altitude, contributing to the crash. Boeing said it is cooperating with investigators. It referred questions to the National Transportation Safety Board.
A report based on black box data from an Indonesian Lion Air jet that crashed last month cites equipment failures and the airline's safety measures as factors in the disaster.
The data reported Wednesday showed the pilots of the Boeing 737 MAX 8 struggled to maintain control as an automatic safety system repeatedly forced the plane's nose down. The report repeats recommendations that pilots be better versed in emergency procedures aware of past aircraft problems.
The probe into the crash has focused on whether faulty information from sensors caused the accident. The new 737 MAX 8 plunged into the Java Sea on Oct. 29, killing all 189 people on board.
Shortly after the catastrophe, the airline issued a notice to pilots urging them to be more proactive in reporting problems.