GAA18CA462
2018-07-29 · Evanston, Wyoming, United States · None · 1 aircraft · Status: Completed
Airport EVW
Current FAA registration · N7893P
- Make / Model
- PIPER PA-24-250
- Engine
- LYCOMING IO-540 SER (300 hp)
- Seats / Engines
- 4 seats · 1 engine
- Last airworthiness date
- 19871001
- ADS-B equipped
- Yes — Mode-S AAB4C4
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
The pilot's failure to extend the landing gear during landing. Contributing to the accident were the pilot's distraction and his failure to complete the appropriate checklist before landing.
Factual narrative
The pilot in the retractable landing gear-equipped airplane reported that during the cross-country flight, the auto-pilot failed and he struggled to use the sectional charts. Additionally, heat and wind made the flight uncomfortable, and smoke from wildland fires decreased visibility to about 5 statute miles so he decided to land. Upon arrival at the airport he decided to leave the landing gear retracted as he searched for the wind sock on the airport. He did not locate the wind sock and attempted to contact the airport on the airport's Unicom, but later discovered that he had used an incorrect frequency. He decided to land on runway 5, which he later identified was the incorrect runway given the wind direction. He recalled that he had completed some variation of the GUMPS checklist but forgot to extend the landing gear and landed with the landing gear retracted. The airplane sustained substantial damage to the longerons and bulkheads. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. The pilot in the retractable landing gear-equipped airplane reported that, during the cross-country flight, the autopilot failed, and he struggled to use the sectional charts. He added that heat and wind made the flight uncomfortable, and smoke from wildland fires decreased visibility to about 5 statute miles, so he decided to land. He completed some of the GUMPS (gas [proper tank selected], undercarriage [gear down], mixture [full mix for landing], and propeller [high rpm setting]) checklist and decided not to extend the landing gear to have better control. Upon arrival at the airport, he decided to leave the landing gear retracted as he searched for the windsock on the airport, but he could not find it. Subsequently, he attempted to contact the airport on the Unicom frequency, but he later determined that he had used an incorrect frequency. He decided to land on runway 5, which he later identified was the incorrect runway given the wind direction. He forgot to extend the landing gear before landing. The airplane sustained substantial damage to the longerons and bulkheads. The pilot reported that there were no preaccident mechanical failures or malfunctions 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-Use of equip/system-Pilot - C
- C Aircraft-Aircraft systems-Landing gear system-Gear extension and retract sys-Not used/operated - C
- C Personnel issues-Action/decision-Action-Forgotten action/omission-Pilot - C
- F Personnel issues-Task performance-Use of equip/info-Use of checklist-Pilot - F
- F Personnel issues-Psychological-Attention/monitoring-Attention-Pilot - F
Verbatim from NTSB's published report. Source file
NTSB_2018_GAA18CA462.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
Search this event elsewhere
External sources are reported, not agency: signal that something happened, not fact about what happened.
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Related research
Matched on aircraft type or causal vocabulary (autopilot). All research papers
- arXiv 2025 · arXiv preprint ROSflight 2.0: Lean ROS 2-Based Autopilot for Unmanned Aerial Vehicles
ROSflight is a lean, open-source autopilot ecosystem for unmanned aerial vehicles (UAVs). Designed by researchers for researchers, it is built to lower the barrier to entry to UAV research and acceler…
- arXiv 2025 · arXiv preprint ROSplane 2.0: A Fixed-Wing Autopilot for Research
Unmanned aerial vehicle (UAV) research requires the integration of cutting-edge technology into existing autopilot frameworks.
- arXiv 2024 · arXiv preprint A Data-Driven Autopilot for Fixed-Wing Aircraft Based on Model Predictive Control
Autopilots for fixed-wing aircraft are typically designed based on linearized aerodynamic models consisting of stability and control derivatives obtained from wind-tunnel testing.
- arXiv 2022 · arXiv preprint Experimental Flight Testing of a Fault-Tolerant Adaptive Autopilot for Fixed-Wing Aircraft
This paper presents an adaptive autopilot for fixed-wing aircraft and compares its performance with a fixed-gain autopilot.
- arXiv 2021 · arXiv preprint An Adaptive Digital Autopilot for Fixed-Wing Aircraft with Actuator Faults
This paper develops an adaptive digital autopilot for a fixed-wing aircraft and compares its performance with a fixed-gain autopilot.
- arXiv 2026 · arXiv preprint Robust Adaptive Sliding-Mode Control for Damaged Fixed-Wing UAVs
Many unmanned aerial vehicles (UAVs) can remain aerodynamically flyable after sustaining structural or control surface damage, yet insufficient robustness in conventional autopilots often leads to mis…