Abstract: An elevator system includes an elevator car configured to travel in a hoistway; an elevator car door configured to open and close; a machine configured to impart force to the elevator car; an interface configured to generate a lockdown mode signal; and a controller configured to control operation of at least one of the machine and the elevator car door in response to the lockdown mode signal.

Abstract: An elevator system includes an elevator car configured to travel in a hoistway; an elevator car door configured to open and close; a machine configured to impart force to the elevator car; an interface configured to generate a lockdown mode signal; and a controller configured to control operation of at least one of the machine and the elevator car door in response to the lockdown mode signal.

Abstract: An airfoiled blade is disclosed which comprises a plurality of airfoil sections, a root portion, and a tip portion. Each section has along substantially the entire length thereof a cross-sectional airfoil shape characterized by a parabolic leading edge, a front loading and a blunt trailing edge. Each of the airfoil sections has a chord passing therethrough with a 50% point and a maximum thickness forward of the 50% point, toward the leading edge. A thickness ratio range from a first of the airfoil sections nearest the tip portion to a last of the airfoil sections nearest the root portion of substantially 3% to 28% is preferred. In one embodiment, the blade further includes a second airfoil section, a third airfoil section and a fourth airfoil section located between the first and last airfoil sections. The first airfoil section has a thickness ratio of substantially 3.3%, the second airfoil section has a thickness ratio of substantially 4.1%, the airfoil section has a thickness ratio of substantially 7.