CARBONADO, WA, USA
N9250U
CESSNA 150M
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.
Source: NTSB Aviation Accident Database
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