Abstract: This invention relates generally to the field of aircraft technology and systems utilized for protection of aircraft, occupants, and operators thereof from hijackers, terrorists, and other anomalous problems while in flight. More particularly, the present invention relates to a device used in conjunction with walls, floor, and ceiling of a cockpit's entry/exit passageway for protecting the cockpit crew from weapons, hostility, decompression, and/or physical intrusions. A light weight protective shield for the cockpit of an aircraft (i.e. bullet-proof door) along with a internal locking and release device, none of which is provided by prior art. The protective shield can absorb repeated blows, provide pressure relief in the event of aircraft decompression, resist penetration of firearms, knives, and explosive devices, and is compliant with FAA regulations.