N3552KPiper PA-28-140 · 1967

On October 2, 2015, about 1030 central daylight time, a Piper PA-28-140 airplane, N3552K, collided with terrain near Huntsville Municipal Airport (UTS), Huntsville, Texas. The private pilot was fatally injured, and the airplane was substantially damaged. The airplane was registered to a private individual and was being operated by the pilot as a 14 Code of Federal Regulations Part 91 personal flight. Visual flight rules conditions existed near the accident site at the time of the accident, and a flight plan had not been filed. The airplane departed UTS just before the accident and was destined for Lone Star Municipal Airport (CXO), Conroe, Texas.

A mechanic who worked for the fixed-base operator (FBO) reported that, on the day before the accident, the pilot was at UTS and that he replaced the airplane's battery. He added that, on the day of the accident, the pilot taxied the airplane to the maintenance hangar where he inflated the nose tire. The pilot told him that he was flying the airplane to Conroe because someone there was interested in purchasing the airplane. The mechanic stated that he told the pilot that the airplane had not been flown in a while, and the pilot stated that he might fly it around the area before heading to Conroe. The mechanic stated he did not see the pilot taxi the airplane nor take off, and no known witnesses saw the airplane take off.

CXO air traffic control tower personnel reported that the airplane did not land at the airport on the day of the accident.

The airplane owner, who was the pilot's brother-in-law, confirmed that the pilot replaced the airplane's battery on the day before the accident. He stated that the pilot was going to check the radios on the day of the accident, but that he was not supposed to fly the airplane.

About 1900, the pilot's family notified the Walker County Sheriff's Office that the pilot was missing. A search was initiated, and the wreckage was located about 2130 on a law enforcement shooting range that bordered the east side of UTS.

The pilot's last Federal Aviation Administration (FAA) third-class medical certificate was issued on July 13, 2006. The medical certificate contained the limitation, "Not valid for any class after 07/31/2007. Must have available glasses for near vision."

On the application for his last FAA medical certificate, the pilot reported having 1,550 hours of flight time, 26 hours of which were flown in the preceding 6 months. The pilot's current flight time could not be determined because no personal flight records were located during this investigation.

The airplane was a low-wing, four-seat, fixed-tricycle-landing gear airplane, serial number 28-23623, manufactured in 1967. The engine, serial number L19195-27A, was installed in the airplane on June 11, 2003, in accordance with Supplemental Type Certificate SE367CH, which increased the horsepower to 160.

The last annual inspection was completed on February 15, 2014, at a tachometer time of 48.2 hours. The tachometer time at the time of the accident was 49.5 hours. The aircraft total time at the time of the accident was calculated to be 3,942 hours.

An employee of the FBO at UTS reported that the airplane was last fueled at UTS on February 14, 2014. The amount of fuel added to the airplane is unknown. The airplane was kept in a hangar until May 5, 2015, when it was relocated to a ramp tie-down space.

The airplane owner stated that it had been about 1 year since the airplane was last flown. He reported that he and the pilot were planning on getting a ferry permit on October 5, 2015, so they could fly the airplane to Conroe for an annual inspection and to park the airplane outside the FBO to sell it. FBO personnel reported that the owner had rented a tie down space on their ramp, but as far as they knew, the airplane had not been parked there.

The airplane was a low-wing, four-seat, fixed-tricycle-landing gear airplane, serial number 28-23623, manufactured in 1967. The engine, serial number L19195-27A, was installed in the airplane on June 11, 2003, in accordance with Supplemental Type Certificate SE367CH, which increased the horsepower to 160.

The last annual inspection was completed on February 15, 2014, at a tachometer time of 48.2 hours. The tachometer time at the time of the accident was 49.5 hours. The aircraft total time at the time of the accident was calculated to be 3,942 hours.

An employee of the FBO at UTS reported that the airplane was last fueled at UTS on February 14, 2014. The amount of fuel added to the airplane is unknown. The airplane was kept in a hangar until May 5, 2015, when it was relocated to a ramp tie-down space.

The airplane owner stated that it had been about 1 year since the airplane was last flown. He reported that he and the pilot were planning on getting a ferry permit on October 5, 2015, so they could fly the airplane to Conroe for an annual inspection and to park the airplane outside the FBO to sell it. FBO personnel reported that the owner had rented a tie down space on their ramp, but as far as they knew, the airplane had not been parked there.

The wreckage was located in a narrow clearing in a wooded area about 1/4 mile east of the approach end of runway 18 at UTC. The wreckage was inverted and on a heading of 10°. Tree branches were embedded in the bottom of the fuselage.

The aircraft battery power was found in the "on" position, and the wingtip lights were illuminated. The cockpit switches for the fuel boost pump, strobes, and instrument lights were in the "on" position. The magneto switch was in the "both" position. The carburetor heat knob was broken off, and the control cable appeared to be in the "off" (cold) position. The mixture control was full rich, and the throttle was at idle. The fuel selector was in the "off" position.

Examination of the airframe revealed that both sides of the aft fuselage were crushed inward and that the left-side crushing was more extensive. The top of the cockpit area was crushed downward to the top of the seats, but the remainder of the cockpit area was not compromised. All four seats were intact. The seats were equipped with seat belts, but shoulder harnesses were not installed. The airplane was not equipped with an electronic locator transmitter.

Both wings sustained impact damage, but they remained attached to the fuselage. The ailerons and flaps remained attached to their respective wings. Both the left and right fuel tanks were intact, and their fuel caps were secured. The right wing fuel tank contained about 4 gallons of fuel, and the left wing fuel tank contained about 16 ounces of fuel. A slow drip of fuel was observed coming from the right fuel tank filler cap before the airplane was righted. There was no evidence of fuel leakage from the left fuel tank. The fuel was clean and consistent with 100LL aviation fuel.

The horizontal stabilator, rudder, and vertical stabilizer sustained minor damage, and all remained attached to the empennage. The top of both the rudder and vertical stabilizer were crushed. The pitch trim drum displayed nine threads upper extension of the inner shaft, which was consistent with a trim setting of about 50% or 6° of the available 12° nose-up trim.

Flight control continuity was established from each flight control surface to their respective cockpit controls. Both the left and right flaps were in place, and the flaps were extended about 40°. All three landing gears remained attached.

The gascolator bowl was removed, and it was about three-quarters full of clean fuel that was consistent with 100LL aviation fuel. The gascolator screen and fuel boost pump filter were free of debris. The carburetor was removed and disassembled. Metal floats and a one-piece venturi were installed. No fuel was present in the carburetor bowl. The carburetor fuel inlet screen was examined, and it was free of debris.

The engine was rotated by hand using the propeller. Thumb compression, suction, and valve train continuity were confirmed to all cylinders. Accessory gear rotation was verified, and both magnetos sparked all leads when the engine was manually rotated. All spark plugs, Champion (REM40E) were removed and were light grey. All of the spark plugs were mid- to late-service life per the manufacturer's chart. Damage to the starter housing from impact with the ring gear was consistent with slow rotation/no power at the time of impact.

The propeller remained attached to the propeller flange. One propeller blade was straight. The other blade had a slight bend near its tip. No anomalies were identified with the airframe, flight controls, engine, engine components, or the propeller that would have prevented their normal operation.

The Montgomery County Forensic Services Department conducted an autopsy on the pilot. The manner of death was attributed to "multiple blunt force injuries." The autopsy report stated the pilot had arteriosclerotic cardiovascular disease, diabetes, and kidney stones. The autopsy, FAA medical records, and the pilot's medical records from his personal physician were reviewed, and no evidence was found to suggest that the pilot suffered an acute cardiac event at the time of the accident.

Toxicology testing performed by the FAA's Bioaeronautical Research Sciences Laboratory identified 0.088 ug/ml of diphenhydramine in heart blood, and tamsulosin and yohimbine in cavity blood. All three drugs were also identified in urine. In addition, 366 mg/dl of glucose was confirmed in urine (normal is 0). Clinical lab tests performed on the pilot's vitreous found 8 mg/dl of glucose and his blood revealed a hemoglobin A1C of 9 %.

Diphenhydramine is a sedating common over-the-counter antihistamine used to treat the common cold and hay fever and as a sleep aid. Diphenhydramine carries the following FDA warning: may impair mental and/or physical ability required for the performance of potentially hazardous tasks (e.g. driving, operating heavy machinery). The therapeutic range for diphenhydramine is 0.0250 to 0.1120 ug/ml. Tamsulosin is an alpha blocker used in the symptomatic treatment of benign prostatic hyperplasia. Yohimbine is an alkaloid with stimulant and aphrodisiac effects found naturally in Pausinystalia Yohimbe. Neither causes significant sedation or other psychoactive effects.