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CP140103 Aurora - From the Investigator
¿ªÔÆÌåÓýHere's the report with both of its?photos and with their captions, too.
? Also, here's an explanation of the term "reverted rubber hydroplaning": ? ? Reverted Rubber (steam) Hydroplaning ? "Reverted rubber (steam) hydroplaning occurs during heavy braking that results in a prolonged locked-wheel skid. Only a thin film of water on the runway is required to facilitate this type of hydroplaning. The tire skidding generates enough heat to cause the rubber in contact with the runway to revert to its original uncured state. The reverted rubber acts as a seal between the tire and the runway, and delays water exit from the tire footprint area. The water heats and is converted to steam which supports the tire off the runway. Reverted rubber hydroplaning frequently follows an encounter with dynamic hydroplaning, during which time the pilot may have the brakes locked in an attempt to slow the airplane. Eventually the airplane slows enough to where the tires make contact with the runway surface and the airplane begins to skid. The remedy for this type of hydroplane is for the pilot to release the brakes and allow the wheels to spin up and apply moderate braking. Reverted rubber hydroplaning is insidious in that the pilot may not know when it begins, and it can persist to very slow groundspeeds (20 knots or less)." For those more familiar with the RAF's accident categories, note that in Canada, "A" Cat is the worst, whereas in the U.K., it's the least. The RCAF defines "B" Cat as "The aircraft must be shipped to a contractor or depot-level facility for repair." It hasn't been decided yet if 140103 will be repaired. ? Jeff ? ========================== CP140103 Aurora - From the Investigator Report / August 27, 2015 / Project number: CP140103 Aurora - B Category Location: 14 Wing Greenwood, Nova Scotia Date: 2015-08-27 Status: Investigation Ongoing The CP140 Aurora was taking off from 14 Wing Greenwood, Nova Scotia, on a transit mission to Iqaluit, Nunavut, in support of Operation Qimmiq. Thunderstorms had recently passed over the airport and the ground surfaces were wet. During the takeoff roll, the crew observed a flock of birds heading towards the runway. Seeing a conflict and concerned about the risk of collision, the aircraft commander directed the pilot flying to abort the takeoff. During the abort procedure, when the pilot flying selected full reverse on all four propellers, both propellers on the left side of the aircraft went into full reverse; however both propellers on the right side of the aircraft continued to produce some forward thrust. The crew was not successful at keeping the aircraft on the runway and it departed off the left side of the runway approximately 1000 feet before the end. The propellers contacted a Runway Distance Marker and a Precision Approach Path Indicator (PAPI) light. The aircraft plowed through the soft earth and the nose gear collapsed, causing the inside propeller on the right side of the aircraft to strike the ground and break away from the engine. All personnel on board exited the aircraft safely and only minor injuries were incurred. The investigation is focussing on a combination of factors, both human factors and technical, including the weather, the take-off abort procedure and the propellers¡¯ pitch control mechanism. The possibility of reverted rubber hydroplaning is also being examined. ================================== ? ? The aircraft plowed through the soft earth and the nose gear collapsed, causing the inside propeller on the right side of the aircraft to strike the ground and break away from the engine. (DND photo) ? ? The crew was not successful at keeping the aircraft on the runway and it departed off the left side of the runway approximately 1000 feet before the end. (DND photo) |
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