Sullivan Lake State Airport: Metaline Falls, Washington

Airport is located 3 miles south east of Metaline Falls.

The private pilot was landing on a remote, snow-covered, seasonal airstrip that was closed. He reported that when the airplane touched down, the nose gear broke through the 5-6 inches of crusted snow on the runway and the airplane nosed over. The airplane sustained substantial damage to the vertical stabilizer and wings. The pilot reported no pre-accident mechanical failures or malfunctions with the airplane. The Federal Aviation Administration Airport Facility Directory entry for the airport noted that the airport was unattended and closed from October 1 through June 1 each year.
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The pilot reported that during the landing on the unimproved mountain airstrip, he did not apply the brakes as he intended to “coast” up to the end of the runway, and then depart in the opposite direction, downhill. The pilot did not identify the end of the runway until the last moment when he applied the brakes and full right rudder. However, the airplane exited the runway and impacted a ditch, resulting in the collapse of the left main landing gear. The pilot stated that he had identified the red runway end marker in the air, but could not see it in the tall grass until it was too late. The airplane sustained substantial damage to the left main landing gear assembly. The pilot reported no mechanical anomalies with the airplane or flight control system.
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The pilot reported that upon arriving at his intended destination he noted that the winds were light and variable but appeared to favor landing toward the lake on runway 16. Trees were located near the approach end of the 1,765-foot-long turf runway, and the pilot stated that he landed "longer than usual." Despite application of brakes, the pilot stated that he was unable to stop before reaching the end of the runway. The airplane went down an embankment and into the lake that is adjacent to the runway's departure end. The airplane came to rest partially submerged. When the airplane was subsequently extracted from the water the firewall was found bent. The pilot made no allegation of having experienced any mechanical malfunction with his airplane during the accident flight.
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The pilot was about to release a load of logs onto a log pile from an altitude between 150 to 200 feet when ground crewmen heard an explosion, then observed the helicopter descend in a nose down attitude before impacting the log deck. An examination of the accident site by an FAA inspector revealed that all major portions of the helicopter were accounted for. A subsequent examination of the wreckage revealed a failure of the transmission's left-hand cross-shaft internal spline, which resulted in the loss of gearbox timing and subsequent in-flight blade contact and separation. Maintenance records revealed that the helicopter's transmission was overhauled on May 1, 2006; the time between the overhaul and the accident was 409.4 hours. An examination of the fractured transmission center housing was caused by two fatigue cracks, which were probably caused by severe cyclic stresses that resulted from repeated loading and unloading of logs.