System and method for detecting bad runway conditions
First Claim
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1. A method for detecting a runway condition comprising:
- detecting that an aircraft is on a runway with a weight on wheel system;
transitioning to an on ground condition, wherein the on ground condition permits braking of the aircraft; and
determining that the runway is contaminated due to the transitioning being due to expiration of a weight on wheel time limit; and
delaying application of a braking force to at least one of a first landing gear or a second landing gear due to a calculated first axle reference speed being less than an on ground threshold speed until expiration of the weight on wheel time limit, wherein calculating the first axle reference speed comprises averaging a wheel reference speed of a plurality of wheels on the first landing gear.
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Abstract
Systems and methods for detecting runway conditions are disclosed. A weight on wheel system may determine that an aircraft is on the ground. Wheel speed sensors may measure the speed of the aircraft wheels. Axle reference speeds may be calculated for each landing gear based on the speed of the aircraft wheels. A weight on wheel time limit may be reached prior to the axle reference speeds reaching an on ground threshold. A brake control unit may determine that the runway is contaminated if the on ground threshold was not reached.
10 Citations
17 Claims
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1. A method for detecting a runway condition comprising:
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detecting that an aircraft is on a runway with a weight on wheel system; transitioning to an on ground condition, wherein the on ground condition permits braking of the aircraft; and determining that the runway is contaminated due to the transitioning being due to expiration of a weight on wheel time limit; and delaying application of a braking force to at least one of a first landing gear or a second landing gear due to a calculated first axle reference speed being less than an on ground threshold speed until expiration of the weight on wheel time limit, wherein calculating the first axle reference speed comprises averaging a wheel reference speed of a plurality of wheels on the first landing gear. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of detecting a runway condition, using an aircraft brake control unit, comprising:
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determining, using a weight on wheel system, when an aircraft is on a runway; monitoring an elapsed time initiated at when the aircraft was determined to be on the runway; calculating an on ground threshold speed; measuring, using a wheel speed sensor coupled to at least one wheel of the aircraft, at least one axle reference speed; and determining whether or not the runway is contaminated based on whether the at least one axle reference speed exceeds the on ground threshold speed before the elapsed time exceeds a weight on wheel time limit. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A system for detecting a runway condition comprising:
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a first wheel speed sensor coupled to a first landing gear of an aircraft; a second wheel speed sensor coupled to a second landing gear; and a brake control unit, wherein the brake control unit performs operations comprising; calculating a first axle reference speed for the first landing gear; calculating a second axle reference speed for the second landing gear, wherein the first axle reference speed is greater than the second axle reference speed due to a contaminant on the runway; and determining, in response to the first axle reference speed and the second axle reference speed both being greater than an on ground threshold prior to a weight on wheel time limit, that a touchdown portion of a runway is not contaminated. - View Dependent Claims (15, 16, 17)
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Specification