A late-night Airbus alert triggered an emergency EASA directive, giving airlines just 32 hours to update critical flight-control software or face aircraft grounding.
When Airbus issued an urgent technical alert at 11:00 p.m. on 28 November, Vietjet was thrust into one of the most time-critical operational challenges affecting its Airbus A320-series fleet.
The alert was followed by a mandatory Emergency Airworthiness Directive (EAD) from the European Union Aviation Safety Agency (EASA), requiring ELAC (Elevator and Aileron Computer) flight-control software on all Airbus A319, A320, and A321 aircraft worldwide to be updated or replaced by 6:59 a.m. on 30 November.
The directive addressed a specific technical risk. Under certain conditions, the software could be affected by solar radiation interference, potentially triggering uncommanded nose-down inputs. Nearly 6,000 aircraft globally were impacted. In Vietnam alone, 81 aircraft required urgent action, 69 of which were operated by Vietjet.
The resulting 32-hour window marked an unprecedented operational challenge for Vietnam’s aviation sector, according to a report by Tuoi Tre News.
Within hours of receiving Airbus’ alert, Vietjet activated its Emergency Response Committee, mobilising engineering, flight operations, scheduling, and technology teams across its network.
Using its AMOS (Aircraft Maintenance and Engineering Operating System) maintenance management system, which integrates fleet data and predictive analysis, Vietjet conducted a real-time assessment of aircraft configurations, locations, and operational constraints. At the same time, contingency plans were developed to maintain network stability, including aircraft redeployment and schedule optimisation to minimise passenger disruption.
Logistics added further complexity. Airbus estimated that each software update would typically take two to three hours per aircraft, while specialised equipment was limited and aircraft were operating across multiple domestic and international stations.
The operation reached a turning point in Da Nang, where Vietjet engineer Nguyen Van Trung, drawing on more than 15 years of operational experience, completed a full ELAC software update in just 45 minutes without bypassing any mandatory safety steps.
Aircraft software updates are multi-layered procedures. Each aircraft has a unique configuration that must be verified, standardised, tested, and cross-checked. One engineer performs the update, while another independently monitors parameters and documentation.
“Nothing can be skipped,” Trung was quoted as saying. “But experience allows you to know exactly where time can be optimised, and where it absolutely cannot.”
The first aircraft to complete the update, VN-A644, became the reference point for the revised procedure. The optimised workflow was subsequently standardised and shared with engineering teams at Noi Bai, Tan Son Nhat, and international stations, accelerating progress across the fleet.
Alongside software updates, Vietjet prepared hardware contingency solutions, including pre-positioning ELAC units from grounded aircraft for immediate replacement if required.
The airline also received support from Vietjet Thailand and other carriers, including Vietnam Airlines and Bamboo Airways, which provided additional equipment to help scale the operation.
Digitalised technical documentation on iPads, standardised software libraries, and real-time fleet visibility enabled teams to compress administrative timelines while maintaining full compliance with Airbus and EASA safety requirements.
Aircraft were scheduled for updates between flights at the airline’s main technical bases, allowing the airline to meet the regulatory deadline while maintaining operational continuity.
By 3:00 a.m. on 30 November, all 69 affected Vietjet aircraft had completed the required software updates, nearly four hours ahead of the EASA deadline. No aircraft was grounded as a result of the issue, and flight operations continued throughout the operation.
For Vietjet’s leadership, engineering, and operations team, the final hours of November were focused on execution under regulatory time pressure.
As Vietjet’s Standing Vice President To Viet Thang noted, the 32-hour effort stands as a defining moment — one that transformed a standard three-hour procedure into a 45-minute benchmark under extreme pressure, while upholding uncompromising safety standards.
According to Uong Viet Dung, Director General of the Civil Aviation Authority of Vietnam (CAAV), Vietnamese airlines responded proactively following Airbus’ alert.
Despite the unusually large number of affected aircraft, Vietjet had prepared adequately in terms of technical capability, personnel, equipment, and digital systems, enabling the airline to meet the emergency airworthiness requirements within the mandated timeframe.
The operation highlighted the airline’s ability to rapidly assess resources, deploy optimised technical solutions, and balance flight operations with mandatory maintenance requirements, in line with international safety standards and regulatory standards.
Rather than a singular technical fix, the 32-hour response reflected coordinated planning, technical discipline, and cross-border collaboration. In an industry governed by strict safety margins and fixed deadlines, the episode underscored Vietjet’s operational readiness when responding to time-critical regulatory demands.
