4 Aug 2017: CESSNA 170 A

4 Aug 2017: CESSNA 170 A — Unknown operator

No fatalities • Moab, UT, United States

Probable cause

The pilot’s improper decision to depart in unfavorable weather conditions, which resulted in a hard, forced landing.

— NTSB Determination

Accident narrative

According to the pilot, he and his passenger were waiting in the fixed-base operator building for the storm system to pass.

When the storm system appeared to have passed and the wind had calmed significantly, the pilot checked the Automated Surface Observing System (ASOS) and took off on runway 21.

During the initial climb, the pilot observed "Just beyond the end of the pavement was the obvious sign of a small microburst developing with blowing dust curling up in several different directions centered just to the right of the centerline, and it was growing spreading out quickly".

The pilot was able to climb about 400ft before encountering the wind at the departure end of the runway.

He made a slight left turn to avoid powerlines and performed a forced landing.

The airplane landed hard and sustained substantial damage to both wings, the fuselage and the empennage.

The Special METAR, reported that about the time of the accident the wind was from 280° at 23 knots gusting to 34 knots. The visibility was10 statute miles with light rain. There were few clouds at 3,500 feet and the ceiling was broken at 9,000 feet and 11,000 feet. The temperature was 84°F and the dew point was 45°F. The altimeter setting was 30.06 inches of mercury. The peak wind was from 10° at 40 knots at 1903 MDT and the wind shifted direction at 1910 MDT. The rain began at 1958 MDT with trace precipitation. The density altitude was 7,164ft.

The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Contributing factors

  • cause Pilot
  • Effect on operation
  • Effect on operation
  • Effect on operation

Conditions

Weather
VMC, wind 280/23kt, vis 10sm

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