What happened

The aircraft experienced multiple issues shortly after takeoff, including erroneous airspeed and altitude readings, with the plane's Maneuvering Characteristics Augmentation System (MCAS) repeatedly pushed the nose down, despite the pilots' attempts to counteract it. 

The flight crashed into the Java Sea at approximately 450 mph, resulting in the deadliest accident in Lion Air's history and the most severe crash involving a Boeing 737.

The crash resulted in the loss of 189 lives, causing immense grief for families, friends and communities.

Why it happened

The crash was found to have been caused by a combination of factors, notably: 

• A misaligned angle of attack (AOA) sensor provided incorrect data to the flight control computer.

• The MCAS system, designed to rely on a single AOA sensor, was vulnerable to erroneous input.

• Inadequate documentation and communication about previous issues with the aircraft.

• Insufficient pilot training on handling MCAS-related emergencies.

• Design flaws in the Boeing 737 MAX 8, including the expanded functionality of the MCAS system.