Investigation Summary
The accident occurred during the first flight of MSN023, an aircraft destined for the Turkish Air Force. During the final assembly process in Seville, the engine control software was installed on the Electronic Control Units (ECUs). However, a procedural error led to the accidental erasure of the torque calibration parameters for engines one, two, and three. These parameters are essential for the FADEC to translate pilot throttle commands into engine power. Because the A400M design did not provide a cockpit alert for missing calibration data while the aircraft was on the ground, the crew was unaware of the defect during taxi and the takeoff roll. The engines provided sufficient power for takeoff, but once airborne, the FADECs experienced a 'power freeze'. When the crew moved the thrust levers to 'Flight Idle' after liftoff, the three affected engines responded by reducing power to idle but then remained stuck there, failing to respond to any subsequent attempts to increase thrust. Only engine four functioned normally. The crew's inability to manage thrust on three engines led to a loss of control and the subsequent crash into a field while attempting to return to the airport.
Final Conclusions
The investigation by the Spanish military agency CITAAM concluded that the primary cause was the accidental deletion of torque calibration data during the software installation process at the Airbus final assembly line. This resulted in a 'power freeze' on three engines. The investigation also highlighted a lack of cockpit warnings for this specific failure mode while the aircraft was on the ground, which prevented the crew from detecting the issue before becoming airborne. Airbus executives acknowledged a 'serious quality problem' in the final assembly and implementation of test procedures.
Video Analysis
No video analysis linked for this case file yet.
Airframe & Maintenance
Systems & Failure Modes
FADEC (Full Authority Digital Engine Control)
The digital system that manages engine performance. In this accident, the FADECs for three engines could not process power settings because their torque calibration parameters had been deleted.
ECU (Electronic Control Unit)
The hardware units where the engine control software is installed. Airbus later mandated one-time checks of these units across the A400M fleet.
Interesting Facts
- 01The aircraft was serial number MSN023, scheduled for delivery to the Turkish Air Force in June 2015.
- 02Three of the four Europrop TP400-D6 engines failed to respond to pilot commands after takeoff.
- 03The torque calibration parameter data was accidentally wiped during software installation at Airbus facilities.
- 04There was no cockpit alert to warn the pilots of the missing engine data while the aircraft was on the ground.
- 05Four crew members were killed, and two were seriously injured in the crash.
Safety Actions & Advisories
ECU Software Verification
Airbus issued an Alert Service Bulletin requiring all A400M operators to perform one-time checks on the Electronic Control Units (ECUs) to ensure torque calibration data was present.
Production Quality Audit
Airbus implemented additional detailed checks during the engine and ECU installation process to prevent accidental data erasure during software loading.
Flight Test Suspension
Spain temporarily withdrew Airbus's permit to conduct flight tests of the A400M until preliminary investigation results confirmed the nature of the software issue.
Known Controversies & Unanswered Questions
Data Access Dispute
Reference ↗Airbus CEO Tom Enders publicly criticized Spanish authorities for withholding flight recorder data from the manufacturer during the early stages of the investigation, which Airbus claimed delayed their ability to understand the cause.
Location
APPROXIMATE POSITION · AIRPORT LEVEL · Coordinates are the estimate published in the entered by an editor. The ring shows the accuracy the record supports, not the point of impact.