Patent ID: 7249737

Claim:
Security door system for installation in a passageway connecting a passenger compartment and a cockpit of an aircraft, comprising: substantially cylindrical wall comprising an exterior wall and an interior wall defining within said wall a first aperture and a second aperture, said first aperture communicating between said passenger compartment and an interior cavity of said security door system, and said second aperture communicating between said interior of said security door system and said cockpit of said aircraft, first and second doors coextensive respectively with said first and second apertures in said wall, a plurality of powered traction means disposed within said security door system and at least one of said powered traction means having connection with each of said doors for selectively and independently withdrawing said first and second doors away from said first and second apertures into pockets defined between said exterior wall and said interior wall and said powered traction means further having connection with said doors for selectively drawing said first and second doors across said first and second apertures, respectively, control means electrically operable from within said cockpit for independently opening said first door for entry of a candidate into said interior cavity of said security door system, said control means additionally having means for closing said first door for enclosing said candidate within said security door system, said security door system further comprising means for evaluating said candidate with respect to whether said candidate is safe to permit into said cockpit, and said control means additionally having means for independently opening said second door for permitting said candidate to enter the said cockpit.