ABSTRACT
An emergency stop control enables one kind of critical action: halting an action or process immediately. But, there are other emergency actions that might need to happen immediately. Make sure users can perform safety-critical tasks quickly and easily during emergencies. Aircraft manufacturers go to great lengths to make these doors relatively intuitive to open by limiting the number of required actions and providing instructions on both the door and in instructional cards. Triggering the ejection seat must require a deliberate rather than inadvertent action because an injection from a jet moving at the speed of sound can subject a pilot or crew member to a 20G force. Activating a reserve chute when the main chute fails is another example of a safety-critical task that needs to be performed quickly. The reserve chute release mechanism requires only a single action and is often color coded red to convey its emergency purpose.
