NTSB Identification: SEA86FA245.
The docket is stored on NTSB microfiche number 31720.
Accident occurred Friday, September 12, 1986 in CARBONADO, WA
Aircraft: CESSNA 150M, registration: N9250U
Injuries: 2 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE INSTRUCTOR AND PASSENGER DEPARTED ON EITHER AN INTRODUCTORY FLIGHT, INITIAL INSTRUCTIONAL FLIGHT, (OR COMBINATION THEREOF). DURING THE FLIGHT THE AIRCRAFT WAS FLOWN DOWN A CANYON WHICH THE INSTRUCTOR HAD FLOWN DOWN PREVIOUSLY. AS THE AIRCRAFT APPROACHED TRANSMISSION LINES SPANNING THE CANYON THE AIRCRAFT ENTERED AN UNEXPLAINED ABRUPT NOSE DOWN MANEUVER. THE PILOT IN COMMAND DID NOT/WAS UNABLE TO MAINTAIN ADEQUATE CLEARANCE WITH THE LINES AND COLLISION FOLLOWED. THE AIRCRAFT THEN DESCENDED OUT OF CONTROL TO THE BASE OF THE CANYON.

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

CLEARANCE..INADEQUATE..PILOT IN COMMAND


Contributing Factors

REASON FOR OCCURRENCE UNDETERMINED


Contributing Factors

OBJECT..WIRE,TRANSMISSION

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