NTSB Identification: SEA05LA198.
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Accident occurred Wednesday, September 21, 2005 in Ione, WA
Probable Cause Approval Date: 02/28/2006
Aircraft: Cessna 170A, registration: N9527A
Injuries: 1 Fatal.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

After arriving in the area of the accident, the pilot first flew to the north while low over the trees along the side of the Pend Oreille River. He then reversed course and headed to the south about 100 feet or less over the river. As he proceeded south over the river, the aircraft impacted a pair of unmarked power transmission wires that run across the river. Immediately upon contacting the power lines, the aircraft's pitch attitude rotated to a near vertical position, and it descended nearly straight down into the river. In less than two minutes after hitting the surface of the river, the aircraft sank in about 10 feet of water. It was later determined that the power lines were between 80 and 90 feet above the surface of the river. An inspection of the aircraft revealed wires had contacted the propeller, the lower portion of the fuselage just aft of the door frames, and the vertical stabilizer leading edge where it intersects the fuselage. Control continuity was established to the elevator, and there was no indication that there had been any anomaly associated with the engine.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The pilot's failure during low-level maneuvering flight, to maintain clearance from a pair of unmarked power lines. Factors include the pilot's intentional low altitude flight/maneuver and wires.

Full narrative available

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