Communications: electrical – Aircraft alarm or indicating systems – Icing indicator
Patent
1999-06-25
2000-10-31
Lee, Benjamin C.
Communications: electrical
Aircraft alarm or indicating systems
Icing indicator
340945, 340966, 340601, 7317026, 73763, G08B 2100
Patent
active
061409421
ABSTRACT:
A method and system for sensing surface contamination on an aircraft having a control surface. A control element including the control surface is connected to the aircraft by a hinge. The method and system sense a control surface hinge moment about a line on the hinge of the aircraft. A control surface steady hinge moment coefficient is calculated from control surface hinge moment data representing the hinge moment over a period of time. An unsteady hinge moment is calculated which is dependent on the control surface steady hinge moment coefficient. By using a value which is relatively constant during uncontaminated surface conditions, this value can be compared against calculated values to check for variations. If the calculated unsteady value varies from the known uncontaminated values, a warning may be given, alerting an operator of unsafe conditions. This warning is given before a critical value is reached, allowing the operator a period of time to react to the warning. Alternatively, flight control systems may be notified so they may take corrective action.
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Bragg Michael B.
Gurbacki Holly M.
Board of Trustees of the University of Illinois
Lee Benjamin C.
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