Quantcast

Boeing 737 MAX retains redesigned MCAS after software update

Boeing 737 MAX retains redesigned MCAS after software update
Policy
Webp messenger creation 91e228f4 1efa 4504 8c67 bcdad262d741
Boeing 737 MAX | Official Website

The Boeing 737 MAX remains an updated version of the 737NG, developed in response to the demand for more modern aircraft like the Airbus A320neo. This update was initiated as a response to a significant order from American Airlines for 100 planes before the official announcement of the 737 MAX. The 737 MAX series includes several updated features, such as new CFM LEAP-1B engines, winglets, and an updated flight deck. However, it was also equipped with the Maneuvering Characteristics Augmentation System (MCAS), which is linked to the crashes of Lion Air JT610 and Ethiopian Airlines ET302.

"The 737 MAX still has MCAS, but it's not the same as before," stated Boeing, emphasizing changes made to the system. The original MCAS system responded to high angles of attack due to new engine configurations by adjusting the stabilizer trim to counter pitch-up movements, ensuring minimal new training requirements for pilots. Initial reliance on a single Angle of Attack sensor and virtually unlimited authority led to repeated unintended activations, contributing to the tragic accidents involving JT610 and ET302. With redesigns, the system now relies on data from both AOA sensors, reducing authority and enabling system deactivation when sensor data significantly differs.

Pilots initially were not informed about MCAS, which aimed to maintain similarities with earlier 737 models. Following the two crashes and investigations, it was revealed that many pilots experienced unexpected downward pitches. Boeing clarified, "Boeing has reiterated that it is not an anti-stall system, but rather a flight control system intended to provide specific flight characteristics." However, flight crews of both crashed flights faced sudden and forceful MCAS activations amid challenging flight conditions.

Get the Newsletter
Sign-up to receive weekly round up of news from Sky Industry News
By submitting, you agree to our Privacy Policy and Terms of Service. By providing your phone number you are opting in and consenting to receive recurring SMS/MMS messages, including automated texts, to that number from our short code. Msg & data rates may apply. Reply HELP for help, STOP to end. SMS opt-in will not be sold, rented, or shared.

To address the aerodynamic differences introduced by the larger CFM LEAP engines, Boeing intended MCAS to avoid extensive retraining costs. The 737 MAX's conventional flight controls meant that adjustments like MCAS were required, unlike the electronic systems in fully Fly-by-Wire aircraft. "It was decided that the 737 MAX would include a modified version of the KC-46's MCAS," previously used in Boeing's KC-46, an aircraft weighing and balance complexities.

The public reputation of Boeing took a hit, with the 737 MAX grounding stretching for 18 months, the longest for any US-designed aircraft. This ended up causing Boeing costs upwards of $20 billion in fees and compensations. Nevertheless, the aircraft's fuel efficiency and robust design garner a positive reputation, particularly for the majority variant, the MAX 8. Yet, Boeing's haste to bring the jet to market against the Airbus A320neo contributed to a lasting association between the 737 MAX and MCAS.

Boeing's current strategy could not prevent further issues. "The 737 MAX is also struggling more against the Airbus A320 than its predecessor," revealing the complexities Boeing continues to face in the competitive single-aisle aircraft market.

Organizations Included in this History
More News

Ethiopian Airlines has announced the launch of a new daily passenger service to Abu Dhabi, United Arab Emirates.

Jul 16, 2025

Etihad Airways has announced the launch of services to seven new destinations—Almaty, Baku, Bucharest, Medina, Tashkent, Tbilisi, and Yerevan—beginning in November 2025.

Jul 16, 2025

Airlines for America has emphasized the need for increased funding from the Federal Aviation Administration (FAA) to hire more air traffic controllers, update infrastructure, and build on the One Big Beautiful Bill down payment.

Jul 16, 2025

Los Angeles International Airport (LAX) has announced a complete closure of Aviation Boulevard between Arbor Vitae Street and Century Boulevard from July 14 at 9 a.m. to July 21 at 6 a.m. Shuttle access to the LAX/Metro Transit Center will remain...

Jul 16, 2025

Avianca has announced the launch of a social media thread on X, inviting travelers to explore Dallas as a new destination.

Jul 16, 2025

Finnair announced that Palta and the Finnish Transport Workers’ Union (IAU) have reached a negotiation result, leading to the cancellation of all previously announced strikes and the resumption of normal flight operations.

Jul 16, 2025