Narrative:

Landing strip is in a canyon, 2500 ft long with 500 ft displaced threshold. Runways 6/24. Windsock at beginning of 24 was limp, failed to pick up windsock at end of 24. Air was very bumpy, so kept little extra power on during final to compensate. Landed at 90 KTS, 5-7 KTS faster than normal. Flare was longer than normal but not excessive. Rollout much longer than normal, plane ran off end of runway. After stopping saw that windsock at end of 24 showed a tailwind of approximately 10 KTS. To prevent recurrence: pick up both windsocks before deciding on runway and use runway that will have headwind during rollout.

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Original NASA ASRS Text

Title: SMA ROLLS OFF END OF RWY AFTER LNDG DOWNWIND.

Narrative: LNDG STRIP IS IN A CANYON, 2500 FT LONG WITH 500 FT DISPLACED THRESHOLD. RWYS 6/24. WINDSOCK AT BEGINNING OF 24 WAS LIMP, FAILED TO PICK UP WINDSOCK AT END OF 24. AIR WAS VERY BUMPY, SO KEPT LITTLE EXTRA PWR ON DURING FINAL TO COMPENSATE. LANDED AT 90 KTS, 5-7 KTS FASTER THAN NORMAL. FLARE WAS LONGER THAN NORMAL BUT NOT EXCESSIVE. ROLLOUT MUCH LONGER THAN NORMAL, PLANE RAN OFF END OF RWY. AFTER STOPPING SAW THAT WINDSOCK AT END OF 24 SHOWED A TAILWIND OF APPROX 10 KTS. TO PREVENT RECURRENCE: PICK UP BOTH WINDSOCKS BEFORE DECIDING ON RWY AND USE RWY THAT WILL HAVE HEADWIND DURING ROLLOUT.

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.