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WPR21LA264

2021-06-30 · Twin Falls, Idaho, United States · None · 1 aircraft · Status: Completed

Airport PVT

Current FAA registration · N9609H

Make / Model
CHRISTEN INDUSTRIES INC A-1
Year of manufacture
1990 · 31 years old at event
Engine
LYCOMING O&VO-360 SER (180 hp)
Seats / Engines
2 seats · 1 engine
Last airworthiness date
19901114
ADS-B equipped
Yes — Mode-S AD5FC1

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

Partial loss of engine power during a low pass, due to carburetor icing and the pilot’s failure to use carburetor heat during the landing approach.

Factual narrative

The pilot reported that he was practicing basic flight maneuvers at an altitude of about 3,500 ft agl during a short uneventful local flight. He then reduced engine power to idle and initiated a descent back to the private dirt airstrip with the intention of first performing a low pass to confirm the runway was clear, and then landing. As he flew past the runway, he applied full throttle, but the engine did not respond. He then performed a forced landing into an adjacent wheat field, where the airplane nosed over during the ground roll. The pilot stated that he had not used a checklist during the descent and forgot to apply carburetor heat. The wing lift struts, and the vertical stabilizer were substantially damaged. The pilot reported that there were no mechanical failures or malfunctions with the airplane or engine that would have precluded normal operation. The carburetor icing chart from FAA Special Airworthiness Information Bulletin CE-09-35 “Carburetor Icing Prevention” indicated a potential for serious icing at glide power for the temperature and dew point depicted at the time of the accident. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

FAA avdata. C = Cause, F = Factor.

  • — Personnel issues-Task performance-Use of equip/info-Use of checklist-Pilot
  • — Personnel issues-Action/decision-Action-Forgotten action/omission-Pilot
  • — Aircraft-Aircraft systems-Ice/rain protection system-Intake anti-ice, deice-Not used/operated
  • — Environmental issues-Conditions/weather/phenomena-Temp/humidity/pressure-Conducive to carburetor icing-Effect on equipment

Verbatim from NTSB's published report. Source file NTSB_2021_WPR21LA264.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

Related research

Matched on aircraft type or causal vocabulary (icing). All research papers