Several cases of uncommanded spoiler extension were reported to Airbus in recent years. Investigations showed that a high acidity level of the hydraulic fluid was a contributor to these events.
This article recalls the importance of checking the quality of the hydraulic fluid and describes the improvements made to the AMM/MP procedure to perform hydraulic fluid analysis and reduce buildup of acid in the fluid. It also recalls some good practices to prevent hydraulic fluid contamination during maintenance or servicing operations.
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