Beechcraft King Air 350 Crash on Takeoff at Addison Airport, Texas

On June 30, 2019, a Beechcraft King Air 350 twin-engine turboprop crashed shortly after takeoff from Addison Airport in Addison, Texas, resulting in ten fatalities. The aircraft reportedly lifted off, deviated left, rolled, and impacted an empty hangar on airport property. Federal investigators examined the accident to determine whether mechanical, operational, environmental, or maintenance-related factors contributed to the loss of control.

Accident Summary

What Was Reported at the Scene

Witness accounts referenced in early reporting described a sequence in which the aircraft had just lifted off when it veered left, appeared unable to climb normally, and rolled over before impact. Witnesses also described abnormal engine sound or reduced power during the takeoff roll and initial climb. These observations are often relevant because they can help investigators frame the timeline and identify which aircraft systems and performance parameters warrant closer technical examination.

Aircraft and Operational Context

The Beechcraft King Air 350 is a twin-engine turboprop aircraft powered by two Pratt & Whitney turboprop engines mounted on the inboard sections of each wing. In the takeoff and initial climb phase, the aircraft operates close to the performance margins that matter most in a single-engine or asymmetric-thrust scenario, particularly if an engine does not deliver expected power or if propeller feathering does not occur as designed.

In a twin-engine aircraft, a loss of thrust on one side can produce asymmetric thrust and yaw, requiring prompt directional control inputs. Investigators typically evaluate whether the crew had adequate controllability and performance based on airspeed, power settings, aircraft configuration, density altitude, runway length, and any evidence of abnormal engine or propeller behavior.

Directional Control, Airspeed, and Vmc Considerations

One investigative focus in accidents involving loss of control shortly after takeoff is whether the aircraft experienced an engine power reduction or failure and, if so, how controllability and performance evolved. In asymmetric-thrust events, maintaining directional control with rudder input is essential, and maintaining adequate airspeed is a central safety requirement.

Multi-engine performance and controllability concepts commonly discussed in this context include V_YSE (best single-engine rate of climb, often referred to as “blue line”), V_MC (minimum control speed with the critical engine inoperative), and the aircraft’s ability to accelerate and climb after liftoff. Investigators may consider whether the aircraft achieved or maintained target climb speeds, whether yaw/roll tendencies developed rapidly, and whether the sequence is consistent with an asymmetric thrust condition progressing toward a loss of control near V_MC.

Investigators may also consider propeller system behavior. In many turboprop designs, feathering of the propeller on a failed engine reduces drag and improves controllability and climb performance. Where auto-feather systems exist, investigators will typically examine whether those systems functioned as designed, whether cockpit indications were consistent with normal operation, and whether any mechanical evidence supports pre-impact anomalies.

Accident Investigation

The NTSB’s investigative process typically includes on-scene documentation, wreckage recovery and examination, interviews, collection of operational and maintenance records, and technical analysis of powerplant and propeller systems where relevant. A detailed overview of how NTSB investigations proceed is provided in our explanation of the NTSB investigation process.

In an accident like this, the technical workstreams often include (1) engine power and propeller system examination, (2) flight control continuity and trim configuration, (3) weight and balance and aircraft loading, (4) runway environment and performance conditions, and (5) pilot training, procedures, and operational decision-making during the takeoff and initial climb.

NTSB Party Participation and Evidence Access

NTSB investigations commonly use a “party system” in which certain entities with relevant technical expertise—often including manufacturers and operators—may participate under NTSB supervision. The scope of participation, access to evidence, and the sharing of investigative information are controlled by the NTSB’s procedures and may affect when and how information becomes available publicly through the investigative docket and final report materials.

Aviation Accident Litigation

Accidents involving loss of control after takeoff can raise complex questions regarding aircraft performance, engine and propeller systems, maintenance practices, operating procedures, and training. A general overview of how these matters are evaluated is provided in our discussion of aviation accident litigation.

Examples of aviation accident matters involving technical causation and multi-party litigation issues are summarized on our Representative Aviation Matters page.

Where cases proceed to resolution, outcomes are often influenced by the technical record, expert analysis, and evidentiary development. For context regarding reported outcomes in aviation matters, see Selected Aviation Verdicts & Settlements.

Broader observations regarding recurring issues in reported aviation accident litigation are discussed in Aviation Crash Litigation: Common Patterns in Reported Cases.

Finally, in civil cases arising from aviation accidents, the evidentiary use of NTSB materials is subject to specific legal rules and case law, and the admissibility of particular investigation-related materials is often addressed through motions and court rulings on a case-by-case basis.