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GAA16CA501

2016-09-21 · Ottumwa, Iowa, United States · None · 1 aircraft · Status: Completed

Airport OTM

Aircraft involved

Probable cause & findings

The pilot receiving instruction's failure to maintain adequate airspeed and his exceedance of the airplane's critical angle-of-attack during a simulated engine failure and landing, which resulted in an aerodynamic stall. Contributing to the accident was the flight instructor's delayed remedial action.

Factual narrative

The flight instructor reported that the pilot receiving instruction was demonstrating a power-off 180 degree landing. He further reported that as the airplane entered a close-in base to final approach, the airspeed slowed and the stall warning light started to flicker. The flight instructor reported that he stated to the pilot flying, "nose down, nose down," and waited for him to correct. Subsequently, the flight instructor took the flight controls, but as he did so, the airplane entered an aerodynamic stall and touched down hard on the runway. During the landing roll, the flight instructor reported that he lost rudder authority but was able to use differential braking to maintain directional control and taxi off the runway. The right wing sustained substantial damage. The flight instructor reported no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. The flight instructor reported that the pilot receiving instruction was demonstrating a power-off 180 degree landing. He further reported that as the airplane entered a close-in base to final approach, the airspeed slowed and the stall warning light started to flicker. The flight instructor reported that he stated to the pilot flying, "nose down, nose down," and waited for him to correct. Subsequently, the flight instructor took the flight controls, but as he did so, the airplane entered an aerodynamic stall and touched down hard on the runway. During the landing roll, the flight instructor reported that he lost rudder authority but was able to use differential braking to maintain directional control and taxi off the runway. The right wing sustained substantial damage.  The flight instructor reported no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

FAA avdata. C = Cause, F = Factor.

  • C Personnel issues-Task performance-Use of equip/info-Aircraft control-Student/instructed pilot - C
  • C Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Angle of attack-Capability exceeded - C
  • F Personnel issues-Action/decision-Action-Delayed action-Instructor/check pilot - F
  • — Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Airspeed-Not attained/maintained

Verbatim from NTSB's published report. Source file NTSB_2016_GAA16CA501.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

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Related research

Matched on aircraft type or causal vocabulary (stall, engine failure). All research papers