Accident Details
Probable Cause and Findings
The pilot's failure to account for operation at high density altitude at or near the airplane’s maximum gross weight, which led to degraded engine performance and prevented the airplane from achieving an adequate airspeed for a positive rate of climb, resulting in a forced off-airport landing.
Aircraft Information
Registered Owner (Historical)
Analysis
On August 11, 2017, about 1755 mountain daylight time, a Piper PA28-200, N33732, was substantially damaged when it was involved in an accident near West Jordan, Utah. The pilot and one passenger sustained minor injuries. Two other passengers were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.
The pilot reported that in preparation for the cross-country flight from South Valley Regional (U42), Salt Lake City, UT to Casper, Wyoming, he performed a weight and balance calculation and determined that the weight was just below maximum gross weight. Before takeoff he accomplished run-up checks, which included leaning the mixture; no anomalies were noted. The 1730 weather advisory reported the wind from 130o at 3 knots, the altimeter setting was 30.03 inches of mercury and the density altitude was 7,400 ft. The pilot stated that after takeoff from runway 16, when the airplane attained an airspeed of 80 mph, the landing gear was retracted, and he retracted one notch of flaps. The airplane climbed to about 350 ft to 400 ft above ground level then stopped climbing and the airplane was not gaining airspeed above 80 mph. The pilot also noted that the stall indication light was on. The pilot lowered the nose of the airplane a little to gain additional airspeed. The airspeed did not increase, and the pilot reported that he feared that they were in trouble and decided to try and return to the airport. About 30° into a right turn, the airplane began to lose altitude, and by the time he had completed the turn, he knew he was not going to make it to the runway. With power lines now in his path and having determined that he would not be able to clear them, the pilot lowered the airplane's nose and flew under the wires. The pilot subsequently landed in an uneven open field, which resulted in substantial damage to the airplane's left wing.
The pilot reported that he did not believe that there was a loss of engine power. An engine examination and subsequent successful engine run revealed no evidence of a mechanical malfunction or failure that would have precluded normal operation.
At 1755, the local automated weather from U42 indicated wind from 120° at 6 knots, visibility 10 miles, sky clear, temperature 32° C, dew point 12° C, and an altimeter setting of 30.03 inches of mercury. The calculated density altitude at the time of the accident was 7,600 ft.
The airplane's climb performance chart indicated that with the airplane at gross weight of 2,650 lbs, full throttle, the mixture leaned, the landing gear and flaps retracted, an airspeed of 100 mph, and a density altitude of 7,600 ft, the rate of climb was about 490 ft per minute.
Data Source
Data provided by the National Transportation Safety Board (NTSB). For more information on this event, visit the NTSB Records Search website. NTSB# WPR17LA183