What led to the similarities in the 737 MAX angle of attack data?

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The Angle of Attack Data in the Ethiopian and Indonesian 737 MAX Crashes Showed Striking Similarities

Investigators have identified "very, very similar" angle of attack data between the Ethiopian Airlines 737 MAX 8 that crashed in March and the Lion Air flight that went down off Indonesia in October. This similarity points to a potentially shared cause underlying both accidents, which occurred shortly after takeoff and involved pilots reporting flight control issues. Both aircraft were of the 737 MAX 8 model.
A Faulty Sensor and Automated System Under Scrutiny

The core of the ongoing investigation into the Lion Air crash centres on a flight deck computer's reaction to an apparently malfunctioning angle-of-attack sensor. This sensor measures the degrees between airflow and the aircraft's wing, a critical parameter for flight. If the angle of attack becomes too high, it can induce an aerodynamic stall. The 737 MAX model features a new automated system, the Manoeuvring Characteristics Augmentation System (MCAS), designed to push the nose down and prevent stalls. There are questions about whether this system, in response to faulty sensor data, may have contributed to the incidents.
Boeing Plans Software Upgrades

In response to the concerns raised, particularly following the Lion Air crash, Boeing has announced plans to implement software upgrades for the MCAS system. These updates are intended to address the system's potential for overreaction to erroneous sensor inputs. The company has stated that these modifications are being developed to ensure the system's behaviour is appropriately managed even when faced with false sensor data.
Regulatory and Operational Questions Arise

The similarities between the two crashes have led to increased scrutiny of the 737 MAX's certification process and pilot training protocols. Regulators and safety experts are examining the thoroughness of the vetting process for the MCAS system and the adequacy of training provided to pilots worldwide. This situation has prompted some airlines, such as Norwegian Airlines, to seek compensation, and others are reconsidering their outstanding orders for the aircraft.

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What led to the similarities in the 737 MAX angle of attack data?

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