Details are as below:
As we have reported, 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 airplanes. In both cases, the airplane 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 airplane 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 airplane and injury to occupants.
To address these occurrences, Airbus published the Airbus A350 Airplane Flight Manual (AFM) Temporary Revision (TR) 123 Issue 1; 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. Airbus also published the Flight Operators Transmission (FOT) 999.0006/20; reminding operators about the standard practices for handling liquids in the cockpit, to reduce the probability of hazards.
For the reasons described above, this AD requires amendment of the AFM.
Read about the two engine in-flight shut-downs: