Aircraft assembly

An aircraft landing gear assembly comprising:

• a main strut arranged to be movably coupled to an aircraft to be movable between a stowed condition for flight and a deployed condition for take-off and landing;
• a multi linkage side stay coupled between the main strut and a side stay anchor point and having a locking condition in which the side stay reacts attempted movement of the main strut from the deployed position and a passive condition in which the stay permits movement of the main strut to the stowed condition;
• a multi linkage lock stay coupled between the side stay and a lock stay anchor point and having a locking condition in which the lock stay reacts attempted movement of the side stay from the locking condition and a passive condition in which the lock stay permits movement of the main strut to the stowed condition, a first part;
• a linkage of the lock stay, the linkage of the lock stay being movably mounted with respect to the first part;
• an electro-hydraulic actuator coupled between the linkage of the lock stay and a first anchor point, the electro-hydraulic actuator comprising:
• a cylinder defining a bore and a piston and rod assembly slidably mounted within the bore and an active chamber within which an increase in fluid pressure causes the electro-hydraulic actuator to change during a first phase between first and second extension states to move the second part relative to the first part,
• wherein the electro-hydraulic actuator comprises or is coupled to a hydraulic fluid supply circuit comprising a piezo-electric pump operable to supply pressurized fluid to the active chamber to change the electro-hydraulic actuator between first and second extension states,
• wherein the electro-hydraulic actuator is arranged during the first phase to apply an unlocking force to the lock stay to change the lock stay from the locking condition to the unlocking condition, and
• wherein the assembly further comprises a retraction actuator arranged to move the main strut between the deployed and stowed conditions, wherein once the lock stay actuator has attained the second extension state, operation of the retraction actuator biases the lock stay actuator to change during a second phase to a third extension state in which the main strut is in the stowed condition.