Airbus to Update CFM56 Engine Software After A320 Thrust-Reverser Incident

Airbus is taking proactive steps to enhance the safety of A320 aircraft equipped with CFM International CFM56 engines. This initiative involves a software modification to the engine control unit, specifically designed to mitigate safety risks associated with pilots attempting a go-around after activating reverse thrust. Under standard procedures, crews are instructed to commit to a full-stop landing once reverse thrust is engaged, highlighting the critical nature of this update.

The decision for this software modification stems from an in-depth analysis by the Danish accident investigation authority, Havarikommissionen, which revealed a lower-than-expected adherence to operational procedures during thrust reverser activation. This analysis was part of a broader review of the CFM56's reverser design, prompted by a serious incident in Copenhagen where a TAP Air Portugal A320 attempted to abort its landing despite having activated the thrust reversers, resulting in asymmetric thrust due to one engine's reverser doors remaining open.

The incident, which occurred in April 2022, led Airbus to promptly inform A320 operators and update the aircraft's operating manual to emphasize the necessity of a full-stop landing once reverse thrust is selected. Additionally, Airbus advised against the premature arming of reverse thrust before touchdown.

Further investigation into the adherence to recommended practices for reverser use on the A320 revealed that go-arounds after reverser selection are extremely rare, occurring approximately once in every 1 million flights. However, the Copenhagen incident uniquely involved the failure of a reverser to stow during an aborted landing, underscoring the importance of the forthcoming software update.

Havarikommissionen has recommended modifying the CFM56 engine control unit's software, with Airbus already underway in developing the update, expected to be implemented next year. This move signifies Airbus's commitment to continuous improvement and safety enhancement, addressing potential risks to ensure the well-being of passengers and crew across its global fleet.