Advisory system to aid pilot recovery from spatial disorientation during an excessive roll

A system for outputting instructions when a vehicle is not responding to a roll-angle alert, the system comprising:

• one or more altitude sensors configured to determine one of altitude above ground level or barometric altitude;
• one or more roll-angle sensors configured to determine roll-angle of the vehicle;
• a processor configured to
• receive the altitude and roll-angle information,
• determine if a roll-angle condition exists based on the received altitude and roll-angle information, and
• generate a roll-angle alert signal if a roll-angle alert condition exists;
• and
• one or more output devices configured to output one or more of an audio or video signal indicating an alert condition exists if the processor generated the roll-angle alert signal,
• wherein the processor is further configured to
• determine if the alert condition still exists after one of a predefined period of time, the vehicle roll-angle is deteriorating away from a desired threshold, or vehicle roll-angle rate is greater than a roll-angle rate threshold,
• generate a roll-direction signal based upon vehicle position relative to the horizon, if one of the condition still exists after the time delay, the vehicle roll-angle has deteriorated away from the desired threshold, or the roll-angle rate is greater than a roll-angle rate threshold, and
• output the determined roll-direction signal via the one or more output devices.