Chimacum, WA, USA
N6755K
Republic RC-3
After conducting a satisfactory pre-takeoff run-up check of both the right magneto and left coil ignition system, the pilot departed for his destination. Approximately 30 minutes into the flight the engine began to run rough and the pilot determined that the right magneto was not operating. He then selected the left ignition and, although the engine initially continued to run roughly, eventually all power was lost. The pilot selected an open field used by a farmer to operate his Cessna 177 in and out of due to the non-availability of any other adequate landing site. As he maneuvered through a 180 degree turn toward the landing area, he noted a 1,000-foot/minute rate of descent, which was greater than he had anticipated. The landing gear had been extended and as the aircraft was maneuvered onto a short final, the right main landing gear struck a cow. The aircraft yawed into a left skid, contacted the ground and skidded through a barbwire fence. Post-crash examination revealed that the right magneto had grounded internally resulting in its failure to operate. Additional testing revealed the left coil ignition system had also grounded internally as evidence by arcing, and it too, had failed.
On August 12, 2001, approximately 1442 Pacific daylight time, a Republic RC-3, N6755K, recently purchased and being flown by an airline transport rated pilot, was substantially damaged during an in flight collision with objects during the landing flare following a loss of power and forced landing, near Chimacum, Washington. The pilot was uninjured. Visual meteorological conditions prevailed and no flight plan had been filed. The flight, which was personal, was operated under 14 CFR 91, and originated from Orcas Island, Washington, approximately 1415. The pilot reported that he conducted a pre-takeoff run-up including magneto and ignition checks, which were satisfactory (the aircraft's total ignition system consisted of an automotive type coil ignition and a magneto for redundancy). He then departed Orcas Island, Washington, destined for Aurora, Oregon and experienced no engine problems until just passing slightly southwest of Chimacum, Washington. He reported that at that time the engine began to run rough. He selected the "mag" position and determined the magneto was not operating. He then selected the "ignition" position and determined that although the coil ignition was operating, the engine was running rough. The roughness increased until the engine finally quit. The area he was traversing consisted of a channel with shallow water (low tide) and tree stumps/deadheads. He identified a dairy pasture with cattle at the east end and executed a 180-degree right turn to land to the west over flying the cattle. As he entered into the turn he noted a 1,000-foot/minute rate of descent, which was greater than he had anticipated. The landing gear had been extended and as the aircraft was maneuvered onto a short final the right main landing gear struck a cow. The aircraft yawed into a left skid, contacted the ground and skidded through a barbwire fence. The pilot reported that the owner of the field he landed in had operated his Cessna 177 in and out of this same field and that "...it's the only decent place to land within 5 miles radius...." Post crash examination by the pilot, an airframe and power plant mechanic, revealed evidence of arcing due to a direct ground of the coil lead within the coil ignition, as reported to an inspector assigned to the Federal Aviation Administration's Renton Flight Standards District Office (refer to attached Inspector's Report). A check of the ignition coil system by the owner and FAA inspector determined that the coil ignition was unable to produce a spark at any spark plug. After the owner and FAA inspector repaired the coil ignition system, the engine was cranked via the starter. During this evolution, the coil ignition system produced sparks at the respective spark plugs but the magneto, installed on the engine right accessory pad, failed to produce any sparks. Further examination and bench testing of the magneto by the FAA inspector confirmed the magneto had grounded internally (refer to attached Inspector's Report).
An internal ground in the right magneto followed by an internal ground evidenced by arcing in the left ignition coil unit, which led to failure of both the right magneto and the left coil ignition system respectively during cruise. Contributing factors were a cow impacted by the right main landing gear and the pilot's unanticipated higher than expected rate of descent during the 180 degree descending turn to final.
Source: NTSB Aviation Accident Database
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