NTSB CAROL · Event
Event CEN21FA025
Aircraft involved
Probable cause & findings
The pilot’s loss of control shortly after departure for reasons that could not be determined based on the available information.
Factual narrative
HISTORY OF FLIGHTOn October 21, 2020, at 1431 central daylight time, a Beech V35A airplane, N35DC, was destroyed when it was involved in an accident near Slidell Airport (ASD), Slidell, Louisiana. The pilot was fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot’s flight instructor reported that the pilot did not fly often but was interested in renewing his instrument currency. The pilot told him that the airplane’s autopilot was recently repaired, and he wanted to test its functionality. On the day of the accident, the pilot landed at ASD, and the instructor boarded the airplane while the engine remained running. After departure from ASD, the pilot completed two GPS approaches at a nearby airport. The instructor reported that the engine was operating normally, but the autopilot “would not track the course in NAV mode.” They returned to ASD, landed, and dropped off the instructor on the ramp. The instructor entered the airport terminal and did not see the airplane depart. He added that the pilot was relaxed and under no apparent stress. A pilot-rated witness at the airport stated that he observed the airplane as it taxied to runway 36, then continued into a takeoff roll. His view of the airplane was partially blocked by buildings, but he could hear the engine. The airplane climbed slowly and did not exhibit any anomalies, and he did not hear anything unusual with the engine. He looked away briefly and did not see the airplane again. A review of the Automatic Dependent Surveillance – Broadcast (ADS-B) data revealed that the airplane departed ASD at 1315 and proceeded north. The flight track showed that the airplane maneuvered north of ASD for about 1 hour, then appeared to land at ASD at 1421. The flight track continued again at 1431:32 as the airplane departed from runway 36. After the airplane crossed the departure end of runway 36, it turned left. The final ADS-B point was recorded at 1431:47, about 200 ft above ground level. A pilot who departed ASD at 1830 reported that he observed smoke and fire in the woods to the northwest of the airport. When the fire department arrived to extinguish the burning trees that surrounded the airplane, they reported that the airplane was no longer on fire and was cold to the touch. WRECKAGE AND IMPACT INFORMATIONThe accident site was located on the north side of the airport, about 1,300 ft from the departure end of runway 36. The airplane impacted densely wooded terrain in a nose-low attitude and came to rest upright. A postimpact fire consumed the engine compartment, cockpit, forward fuselage, and left wing. The rest of the airplane sustained thermal damage and distress. Figure 1 shows the accident airplane where it came to rest in the woods. Figure 1. Aerial view of the accident site. The wreckage is surrounded by trees. In front of the wreckage was an impact crater. Several trees and tree limbs in the wreckage path exhibited slashes and cuts, consistent with being cut by rotating propeller blades. The cabin door was found about 15 ft from the fuselage and sustained minimal damage. The door latch mechanism revealed the handle was in the latched position. The upper hook was fractured, and the aft latch was displaced inward and down. The seatbelt buckles in the wreckage were lap belt, two-point style buckles. Flight control continuity was established from the cockpit to each control surface with no anomalies noted. The flap actuators were fire-damaged, and their preaccident positions could not be determined. The right flap was found retracted, and the left flap position could not be determined due to the fire damage. The fuel selector valve was positioned to the right fuel tank. The autopilot components were destroyed by the fire; therefore, a full examination was not possible. An examination of the engine revealed impact and fire damage to most of the engine and components. The propeller spinner was crushed against the propeller hub and the blades were bent backward in a manner consistent with a high angle, high velocity impact. There were no mechanical malfunctions or anomalies noted with the engine that would have precluded normal operation. MEDICAL AND PATHOLOGICAL INFORMATIONThe 73-year-old male pilot had reported to the FAA a long history of coronary artery disease and its treatment with stenting and medications. At the time of the accident, he was certified via BasicMed. An autopsy of the pilot was performed by the St. Tammany Parish Coroner’s Office, St. Tammany Parish, Louisiana. The cause of death was multiple blunt force injuries, and the manner of death was accident. Toxicology testing performed by the FAA’s Forensic Sciences Laboratory identified cetirizine and metoprolol in muscle tissue. Review of personal medical records showed slow progression of coronary artery disease, high blood pressure, high cholesterol, and heartburn and the use of medications to treat these conditions. At a visit a few weeks before the accident, the pilot did not report any cardiovascular symptoms. The pilot and flight instructor had just completed a one-hour uneventful local flight to test the recently-repaired autopilot. The pilot landed the airplane, dropped off the instructor at the terminal, and then taxied away. Minutes later the airplane departed to the north, reached about 200 ft above the ground, and entered a left turn. The airplane subsequently descended into trees and terrain and a postimpact fire consumed most of the airplane. There were no witnesses to the accident, and about 4 hours after the accident smoke from the wreckage was reported by another pilot. Examination of the wreckage did not reveal any preimpact mechanical malfunctions or anomalies that would have precluded normal operation; the accident site was consistent with a steep, nose-low descent with the engine producing power. The medical investigation in this case revealed that the pilot had a history of significant coronary artery disease with stents and had used a sedating medication (cetirizine) at some time before the flight; however, whether the pilot’s heart condition or use of sedating medication contributed to the accident could not be determined based on the available information. The evidence at the accident site and the lack of mechanical anomalies are consistent with a loss of control during takeoff; however, the reason for the loss of control could not be determined. 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).
- — Aircraft-Aircraft oper/perf/capability-Performance/control parameters-(general)-Not attained/maintained
- — Personnel issues-Task performance-Use of equip/info-Aircraft control-Pilot
Verbatim from NTSB's published report. Source file
NTSB_2020_CEN21FA025.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
Beyond the agency record
Search this event elsewhere.
Pre-filled searches into the sources where news + community discussion of aviation events lives. External sources are reported, not agency. Treat them as signal that something happened, not as fact about what happened.
Entity-clustered aviation events in the press — last 24 hr + 30-day archive.
Official agency record + docket.
Investigative docket: factual reports, photos, transcripts.
Long-running aviation incident database (Flight Safety Foundation).
Community NTSB synthesis blog — often has photos and witness reports.
Gold-standard aviation incident blog.
Aviation industry news search.
GA pilot forum — informed but rumor-prone.
GA pilot subreddit search.
Tail-number page — flight history (free tier limited).
AOPA Air Safety Institute search.
Mainstream press coverage. Recent events only.
Privacy-preserving news search.
External links open in a new tab. We don't ingest their content; we deep-link search queries.
Related research
What the literature says.
Academic papers and agency reports matching this event's aircraft type or causal vocabulary (loss of control, autopilot). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- 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…
- Embry-Riddle Scholarly Commons 2025 · Journal article (JAAER)
A Scoping Review of Aviation Loss of Control Inflight Research
Loss of control – inflight (LOC-I) contributes to aircraft accidents at unacceptably high rates. Significant industry efforts and research have aimed to improve LOC-I prevention, detection, and recove…
- 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.
- SKYbrary (Eurocontrol) 2024 · SKYbrary article
Loss of Control In-Flight (LOC-I) — SKYbrary Knowledge Base
SKYbrary comprehensive knowledge-base entry on Loss of Control In-Flight — definitions, contributing factors, accident case studies (Air France 447, Colgan 3407), and prevention strategies.
- 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.
Browse the full corpus — academia portal ↗