Credit, AR, USA
N325GC
HAWKER BEECHCRAFT CORP G58
The private pilot and passenger departed in the airplane for a business flight. After departure, the airplane flew southwest, climbed to about 2,300 ft above mean sea level, and started to descend. The flight continued to track southwest then it turned right to the northwest. The airplane’s flight track was lost about 10 minutes after takeoff at a location consistent with the accident site. A pilot who took off behind the accident airplane reported that the runup and takeoff appeared normal. Several witnesses reported hearing and seeing the airplane prior to the accident. They described the airplane as flying low and the engines as not “sounding good” and that they were making “popping” noises.” One witness stated that it sounded like one engine was operating and the other engine was “sputtering”, before both engines quit. A witness near the accident site reported that it sounded like one engine was operating and that the other engine alternately sounded as if it was making a “sputtering” sound and operating normally. Shortly after, it sounded like the engines quit. He said the airplane flew parallel to the high-tension powerlines at an altitude of an aerial application airplane. Another witness near the accident site, observed the airplane fly over his location about 1,000 ft agl, traveling east to west. He said the engines were “popping and sputtering” and making a “backfiring noise.” Postaccident examination of the airframe revealed no anomalies. Blade A of the left propeller was separated from overstress while blade B and C were straight and unremarkable, and the leading edges were unremarkable. The left propeller was against the start lock and at approximately 18° of pitch at impact, consistent with a loss of engine power to the left engine. An examination of the engines revealed all the fuel lines were thermally damaged. The left fuel servo screen was found to be about halfway obstructed and contaminated with an unknown black debris. Postaccident testing of the debris revealed similarities with materials used in aircraft fuel system components, particularly with hoses. It is likely the debris on the screen was soot from the postimpact fire and it could not be determined where and when the polymer signatures originated from. Based on the available evidence, it is likely the left engine lost power while in flight. The witnesses reported hearing noises consistent with an engine misfiring and it likely was losing power; however, the reason for the loss of engine power could not be determined. Based on the flight track, it is likely the pilot attempted to perform a forced landing with one engine inoperative. Given the variety of levels of ethanol and the absence of any in the pilot’s liver, it is most likely that the identified ethanol is from postmortem production rather than ingestion. The pilot’s previous use of cocaine (which often leads to withdrawal effects) and his simultaneous use of a large amount of butalbital and a small amount of temazepam were likely significantly impairing at the time of the accident and likely contributed to his inability to respond appropriately to the left engine’s loss of power.
HISTORY OF FLIGHTOn January 4, 2021, about 0933 central standard time, a Hawker Beechcraft G58 airplane, N325GC, was destroyed when it was involved in an accident near Credit, Arkansas. The private pilot and passenger sustained fatal injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 business flight. According to flight track data, the airplane departed from JBR at 0924. After departure, the airplane flew southwest, climbed to about 2,300 ft above mean sea level, and started to descend. The flight continued to track southwest until 0932, when it turned right to the northwest. The flight track data was lost about 0933 which coincided with the accident site location. A witness who departed behind the airplane reported that everything seemed normal with the airplane during its runup and departure. Several witnesses reported seeing and hearing the airplane shortly before the accident. One witness who was about 1 mile from the airport reported the airplane was flying in a southwesterly direction at an altitude of 500 to 800 above ground level (agl). This witness reported the engines did not “sound good” and they were making a “popping” noise as if they were not firing on all cylinders. A third witness reported seeing the airplane flying parallel to the high-tension powerlines at an altitude of an aerial application airplane. This witness reported it sounded like one engine was operating normally and the other was “sputtering,” before both engines quit. The airplane impacted a flat muddy rice field about 16 miles southwest of JBR. The airplane was destroyed from a postimpact fire. PERSONNEL INFORMATIONThe pilot’s flight logbooks were not available for review during the investigation. AIRCRAFT INFORMATIONAccording to the pilot’s father, the airplane was purchased in July 2020. The airplane was equipped with a Garmin G1000 all-glass avionics suite, a Garmin GFC 700 autopilot system, onboard weather (satellite weather and a weather radar), a stall warning system, and a terrain avoidance and warning system (class B). An examination of the airplane’s maintenance records revealed no evidence of outstanding mechanical discrepancies with the airframe, the propellers, or the engines. AIRPORT INFORMATIONAccording to the pilot’s father, the airplane was purchased in July 2020. The airplane was equipped with a Garmin G1000 all-glass avionics suite, a Garmin GFC 700 autopilot system, onboard weather (satellite weather and a weather radar), a stall warning system, and a terrain avoidance and warning system (class B). An examination of the airplane’s maintenance records revealed no evidence of outstanding mechanical discrepancies with the airframe, the propellers, or the engines. WRECKAGE AND IMPACT INFORMATIONThe airplane impacted terrain in an approximate 45°, nose-low, right wing-low attitude south of transmission lines on a 235° heading. Wire strike signatures were observed on the lower side of the left horizontal stabilizer. The left elevator balance weight was found about 200 ft from the wreckage with wire striations. All the major structural components were found at the accident site. Most of the airframe was consumed by a postimpact fire. Flight control cable continuity was confirmed from each flight control to the center section of the fuselage. Continuity to the cockpit could not be established due to the extent of thermal damage sustained. The flap position was undetermined due to the thermal and impact damage. Most of the fuel system was destroyed due to thermal damage and no fuel samples were available. The fuel selectors were disassembled, and each valve contained light debris, but did not appear to be obstructed. Each selector valve was selected to its respective engine. The left propeller was separated from the engine at the crankshaft propeller flange. Blade A was separated at the root of the blade approximately 6 inches outboard of the hub. The features on the blade A fracture surface were consistent with fracture of the propeller in bending overstress and the fracture direction was consistent with bending aft ward. The pin on the inboard face exhibited features consistent with having fractured from shear overstress. Blade B and C were straight and unremarkable. The left propeller was against the start lock, at approximately 18° of pitch, at impact. The right propeller remained attached to the engine. Blade A was curved opposite the direction of rotation and the leading edge was unremarkable. Blade B was bent aft midspan and there was an area of leading-edge deformation approximately 4 inches in length near the tip that had signatures like wire striations. Blade C exhibited “S” bending midspan to the tip and the leading edge of the blade was unremarkable. An examination of the engines revealed all the fuel lines were thermally damaged. No residual fuel was found in the engines. The left and right fuel servos were disassembled. The left screen was found about halfway obstructed and contaminated with an unknown black debris. The right screen was found to be clear of debris. Postaccident testing of the left screen debris revealed similarities to several fluorocarbon materials/polymers including polytetrafluorethylene, which is a common polymer used in aircraft fuel system components, particularly with hoses. ADDITIONAL INFORMATIONThe Federal Aviation Administration (FAA) pamphlet Flying Light Twins Safely FAA-P-8740-66 states in part: The major difference between flying a light twin and a single-engine airplane is knowing how to manage the flight if one engine loses power. Safe flight with one engine inoperative (OEI) requires an understanding of the basic aerodynamics involved as well as proficiency in single-engine flight. The Hawker Beechcraft Corporation G58 Pilot’s Operating Handbook discusses one engine inoperative procedures and states in part: Airspeed is the single most important factor in maintaining airplane control during single engine operations. The airplane can be safely maneuvered or trimmed for normal hands-off operation and sustained in this configuration by the operative engine AS LONG AS SUFFICIENT AIRSPEED IS MAINTAINED. This document also discusses engine failure procedures while in flight and states in part: The most important aspect of engine failure is the necessity to maintain lateral and directional control. If airspeed is below VMCA (84 kts), reduce power on the operative engine as required to maintain control. MEDICAL AND PATHOLOGICAL INFORMATIONAccording to the autopsy issued by the Arkansas State Crime Laboratory, the cause of death was multiple blunt force injuries, and the manner of death was accident. No significant natural disease was identified. Toxicology tests performed by the Federal Aviation Administration Forensic Sciences Laboratory identified ethanol at a variety of levels in blood samples, but none in liver. N-propanol was also identified in the blood samples. In addition, butalbital was identified at 21,493 ng/mL in blood and 11,617 ng/g in liver. Temazepam (72 ng/ml) and its psychoactive metabolite oxazepam (12 ng/ml) were identified in blood and in liver. All of these are considered potentially impairing. Benzoylecgonine, an inactive metabolite of cocaine, and acetaminophen were also identified in blood and in liver. Ethanol is the intoxicant commonly found in beer, wine, and liquor. It acts as a central nervous system depressant. After ingestion, at low doses, it impairs judgment, psychomotor functioning, and vigilance; at higher doses it can cause coma and death. The effects of ethanol on aviators are generally well understood; it significantly impairs pilots’ performance, even at very low levels. Ethanol may also be produced in the body fluids and tissues after death by microbial activity. N-propanol is another type of alcohol that can be produced in tissues after death. Butalbital is an intermediate acting barbiturate commonly sold in combination with acetaminophen (an analgesic often marketed with the name Tylenol) and caffeine to treat headaches. It is available as Schedule III controlled substance. Butalbital carries the warning, “Butalbital is habit-forming and potentially abusable. Consequently, the extended use of this product is not recommended.” In addition, the drug information states, “This product may impair mental and/or physical abilities required for the performance of potentially hazardous tasks such as driving a car or operating machinery. Such tasks should be avoided while taking this product.” The usual therapeutic range is between 1,000 and 10,000 ng/ml. Temazepam is a sedating benzodiazepine and oxazepam is an active metabolite. Temazepam is indicated for the short-term treatment of insomnia (7-10 days). Temazepam carries warnings about concomitant use with other central nervous system depressants. The usual blood levels for effects from the drug used by itself are between 200 and 1000 ng/ml.
A loss of left engine power for undetermined reasons, which resulted in an emergency descent with one engine inoperative and inadvertent collision with transmission lines. Contributing to the accident was the pilot’s inability to respond appropriately to the emergency due to impairment from his previous use of cocaine and multiple other impairing drugs.
Source: NTSB Aviation Accident Database
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