Aircraft Flight Operation Regulations Article 193

The flight crew compartment doors in passenger-carrying airplane shall be securely closed and locked in flight. An operator shall provide means by which cabin crew member can discreetly notify the flight crew in the event of unlawful interference which may endanger the safety of flight.All passenger-carrying airplane with the following shall be equipped with an approved flight crew compartment door that is designed to resist penetration by small arms fire and grenade shrapnel, and to resist forcible intrusions by unauthorized persons. This door shall be capable of being locked and unlocked from either pilot’s station:1. Of a maximum certificated take-off mass in excess of 54 500 kg.2. Of a maximum certificated take-off mass in excess of 45 500 kg with a passenger seating capacity greater than 19.3. With a passenger seating capacity greater than 60.All passenger-carrying airplanes equipped with a flight crew compartment door as described in the preceding paragraph shall be closed and locked from the time all cabin entry doors are closed following embarkation until any such door is opened for disembarkation, except when necessary to permit access and egress by authorized persons of the operator or CAA.All passenger-carrying airplanes which are equipped with a flight crew compartment door described in paragraph 2 shall be provided with means for monitoring from either pilot’s station the entire door area outside the flight crew compartment to identify persons requesting entry and to detect suspicious behaviour or potential threat.If an operator fails to equip a flight crew compartment door and the associated monitoring device prescribed in this article due to special circumstances, the operator shall submit documents and statements to CAA for approval.