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Atlas / NTSB / WPR11CA142

NTSB CAROL · Event

Event WPR11CA142

2011-02-22 North Bend, Oregon, United States Airport · KOTH None 1 aircraft Status: Completed

Registry · N9237Y

FAA Aircraft Registry record.

Make / Model

PIPER PA 31P 350

Seats / Engines

7 seats · 2 engines

ADS-B equipped

Yes — Mode-S ACCCB3

Registrant of record

IAL CORP

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

The pilot's failure to lower the landing gear while on approach to landing. Contributing to the accident was the pilot's failure to follow a written checklist during the approach portion of the flight.

Factual narrative

According to the pilot, while in the process of executing a terminal instrument approach to his home airport, he transitioned from instrument meteorological conditions (IMC) to visual meteorological conditions (VMC). He therefore canceled his instrument flight rules (IFR) clearance, and transitioned from the terminal instrument approach to a visual flight rules (VFR) approach pattern. During this sequence of events, the pilot, who was not following a written checklist, inadvertently forgot to lower the landing gear. During the landing flare, the pilot heard the noise caused by the wing flaps and both propellers contacting the surface of the runway, and therefore he added power and immediately executed a go-around. The pilot then entered a closed pattern, lowered the landing gear and repositioned the flaps, before making an uneventful landing. According to the pilot, during his approach he heard the gear warning horn sounding, but he thought it was the altitude alerting system. An inspection of both the runway surface scarring and each propeller blade revealed that the tips of all six blades had been ground down by repeated contact with the asphalt surface. The pilot also said that the airplane did not have any system malfunctions. According to the pilot, while in the process of executing a terminal instrument approach to his home airport, he transitioned from instrument meteorological conditions to visual meteorological conditions. He canceled his instrument flight rules clearance, and transitioned from the terminal instrument approach to a visual flight rules approach pattern. During this sequence of events he did not follow a written checklist, and inadvertently forgot to lower the landing gear. During the landing flare, he heard the noise caused by the wing flaps and both propellers contacting the surface of the runway, and he added power and immediately executed a go-around. He then entered a closed pattern, lowered the landing gear and repositioned the flaps, before making an uneventful landing. He said during the approach he heard the gear warning horn sounding, but he thought it was the altitude alerting system. An inspection of both the runway surface scarring and each propeller blade revealed that the tips of all six blades had been grounded down by repeated contact with the asphalt surface. He also said that the airplane did not have any system malfunctions. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

Hierarchical cause / factor breakdown from the FAA bulk avdata database. Each finding tagged C (Cause) or F (Factor).

  • C Aircraft-Aircraft systems-Landing gear system-Landing gear actuator-Not used/operated - C
  • F Personnel issues-Task performance-Use of equip/info-Use of checklist-Pilot - F
  • C Personnel issues-Action/decision-Action-Forgotten action/omission-Pilot - C
  • C Personnel issues-Task performance-Use of equip/info-Use of equip/system-Pilot - C

Verbatim from NTSB's published report. Source file NTSB_2011_WPR11CA142.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

Related research

What the literature says.

Academic papers and agency reports matching this event's aircraft type or causal vocabulary (go-around, imc). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.

Browse the full corpus — academia portal ↗