After a number of unintended engine shutdowns, due to inadvertent liquid spillage over control panels, the European Union Aviation Safety Agency issued an Emergency Airworthiness Directive for Airbus A350-900/-1000 banning any liquids inside the cockpit.
Two in-service occurrences were reported involving inadvertent liquid spillage on the ENG START panel or ECAM Control Panel (ECP) on the centre pedestal in the flight deck on A350 aeroplanes.
In both cases, the aeroplane experienced an un-commanded engine in-flight shut-down (IFSD) of an engine some time after the liquid spillage. Subsequent engine relight attempts were not successful. In both events, the flight crew performed a diversion and landed the aeroplane safely.
Results of the preliminary technical investigations indicate abnormal operation of the components of the ENG START panel or ECP due to liquid spillage in the system.
This condition, if not corrected, could lead to a dual engine IFSD, possibly resulting in a forced landing with consequent damage to the aeroplane and injury to occupants.
To address these occurrences, Airbus published the AFM TR defining a liquid prohibited zone in the cockpit, and the procedures to be followed in the case of inadvertent liquid spillage on the centre pedestal.