A LOCK

The toilet facilities provided for pilots in modern aircraft are generally sited adjacent the flight deck but with no direct access from the flight deck requiring the pilot to egress the flight deck to avail themselves of the facilities. Given the proximity of passenger seating to the aircraft flight deck door, there is a risk that a passenger may attempt to force entry onto the flight deck when the aircraft is airborne as the pilot steps to and from the flight deck for a toilet break. In order to mitigate this risk, access to the flight deck door is blocked by a flight attendant often with an in-flight service trolley. However this places the flight attendant in danger and thus there is a need for a physical barrier device to protect the flight deck door. In particular, the ability to delay an attempted breach of the flight deck door by at least 5 seconds is required. Thus if a passenger attempts to open the physical barrier device whilst the flight deck door is open, it will take them at least 5 seconds in order to unlock the barrier device.The invention relates to a lock, in particular to a lock for a secondary cockpit barrier, and a secondary cockpit barrier comprising the same and a barrier body for blocking access to an aircraft cockpit.