Narrative:

Monument valley airport is a 1-way in, and 1-WAY out airport. Runways are runway 16/34, lndgs are made on runway 16 which is uphill and has 700-800 ft cliff at the end. Takeoffs are made on runway 34. The runway is 4000 ft by 40 ft and the southern half is paved with loose gravel on the sides and the northern half is dirt. Windshear can be encountered when winds is blowing from the southwest, and directional control can be a problem on takeoff. At the time of takeoff, the wind was variable from 210 degrees to 250 degrees at 5 KTS gusting to 15 KTS. We started the takeoff. The aircraft (DHC6-300) started to veer to the right. I applied proper crosswind control. The aircraft started to straighten up. At around 25-30 KIAS, we encountered severe windshear and the aircraft abruptly turned to the left. At that point, I aborted the takeoff and, when I reduced power, the aircraft turned farther to the left and started to slide sideways. Then, the aircraft went off the left side off the runway and came to rest on a berm in a nose low attitude. I shut down the engines and the first officer and I evacuate/evacuationed the passenger according to the company manual. Supplemental information from ACN471798: rudder effectiveness was completely lost due to the windshear. There was no injury to any of the 15 passenger. Braking was non effective due to the skidding and sliding. Winds do tend to be a problem in the monument valley area, and I believe part 121 operations shouldn't be conducted into their non controled runways unless WX reporting capabilities are available at all times.

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Original NASA ASRS Text

Title: A DHC6-300 PIC RPT ON THE LOSS OF ACFT CTL AND RWY EXCURSION ON TKOF FROM MONUMENT VALLEY ARPT, 71V, UT. ACFT DAMAGED DURING SUBSEQUENT ABORT.

Narrative: MONUMENT VALLEY ARPT IS A 1-WAY IN, AND 1-WAY OUT ARPT. RWYS ARE RWY 16/34, LNDGS ARE MADE ON RWY 16 WHICH IS UPHILL AND HAS 700-800 FT CLIFF AT THE END. TKOFS ARE MADE ON RWY 34. THE RWY IS 4000 FT BY 40 FT AND THE SOUTHERN HALF IS PAVED WITH LOOSE GRAVEL ON THE SIDES AND THE NORTHERN HALF IS DIRT. WINDSHEAR CAN BE ENCOUNTERED WHEN WINDS IS BLOWING FROM THE SW, AND DIRECTIONAL CTL CAN BE A PROB ON TKOF. AT THE TIME OF TKOF, THE WIND WAS VARIABLE FROM 210 DEGS TO 250 DEGS AT 5 KTS GUSTING TO 15 KTS. WE STARTED THE TKOF. THE ACFT (DHC6-300) STARTED TO VEER TO THE R. I APPLIED PROPER XWIND CTL. THE ACFT STARTED TO STRAIGHTEN UP. AT AROUND 25-30 KIAS, WE ENCOUNTERED SEVERE WINDSHEAR AND THE ACFT ABRUPTLY TURNED TO THE L. AT THAT POINT, I ABORTED THE TKOF AND, WHEN I REDUCED PWR, THE ACFT TURNED FARTHER TO THE L AND STARTED TO SLIDE SIDEWAYS. THEN, THE ACFT WENT OFF THE L SIDE OFF THE RWY AND CAME TO REST ON A BERM IN A NOSE LOW ATTITUDE. I SHUT DOWN THE ENGS AND THE FO AND I EVACED THE PAX ACCORDING TO THE COMPANY MANUAL. SUPPLEMENTAL INFO FROM ACN471798: RUDDER EFFECTIVENESS WAS COMPLETELY LOST DUE TO THE WINDSHEAR. THERE WAS NO INJURY TO ANY OF THE 15 PAX. BRAKING WAS NON EFFECTIVE DUE TO THE SKIDDING AND SLIDING. WINDS DO TEND TO BE A PROB IN THE MONUMENT VALLEY AREA, AND I BELIEVE PART 121 OPS SHOULDN'T BE CONDUCTED INTO THEIR NON CTLED RWYS UNLESS WX RPTING CAPABILITIES ARE AVAILABLE AT ALL TIMES.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.