Brutkey

Section of the AOT - Airbus Amber ALERT OPERATORS TRANSMISSION - AOT AOT ref: A27N022-25 Rev 00 Page 3 of 8 Date: 28-NOV-2025 C80_AOT_FM1104649_v10.0 © AIRBUS S.A.S. 2025. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT 3.1 FACTS AND BACKGROUND An Airbus A320 aircraft recently experienced an uncommanded and limited pitch down event. The autopilot remained engaged throughout the event, with a brief and limited loss of altitude, and the rest of the flight was uneventful. 3.2 INVESTIGATION, ROOT CAUSE AND CONSEQUENCES The subsequent investigation identified a vulnerability with the ELAC B hardware fitted with software L104 in case of exposure to solar flares. This identified vulnerability could lead in the worst case scenario to an uncommanded elevator movement that may result in exceeding the aircraft structural capability. This is limited to ELAC B standard L104. All previous ELAC B software standards as well as all ELAC E software standards are not affected. 4. OBJECTIVES OF THIS AOT This AOT requires, as an immediate safety measure, reversion to the ELAC standard L103+ for a significant number of aircraft equipped with ELAC B and software L104 (refer to effectivity paragraph)
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📆📆 Created At
2025-11-29T14:30:18.781Z
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Section of the AOT - Airbus Amber ALERT OPERATORS TRANSMISSION - AOT AOT ref: A27N022-25 Rev 00 Page 3 of 8 Date: 28-NOV-2025 C80_AOT_FM1104649_v10.0 © AIRBUS S.A.S. 2025. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT 3.1 FACTS AND BACKGROUND An Airbus A320 aircraft recently experienced an uncommanded and limited pitch down event. The autopilot remained engaged throughout the event, with a brief and limited loss of altitude, and the rest of the flight was uneventful. 3.2 INVESTIGATION, ROOT CAUSE AND CONSEQUENCES The subsequent investigation identified a vulnerability with the ELAC B hardware fitted with software L104 in case of exposure to solar flares. This identified vulnerability could lead in the worst case scenario to an uncommanded elevator movement that may result in exceeding the aircraft structural capability. This is limited to ELAC B standard L104. All previous ELAC B software standards as well as all ELAC E software standards are not affected. 4. OBJECTIVES OF THIS AOT This AOT requires, as an immediate safety measure, reversion to the ELAC standard L103+ for a significant number of aircraft equipped with ELAC B and software L104 (refer to effectivity paragraph)
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