Фатальная петля на Пайпере

HISTORY OF FLIGHT

On April 12, 2003, about 1600 eastern daylight time, a Piper PA-28-180, N8985J, was destroyed when it impacted trees near Conesus, New York. The certificated flight instructor, certificated private pilot receiving instruction, and passenger were fatally injured. Visual meteorological conditions prevailed for the instructional flight that departed the Dansville Municipal Airport (DSV), Dansville New York, about 1515. A flight plan was not filed, and the flight was conducted under 14 CFR Part 91.

According to a witness, the airplane was operated by a local flying club, and the pilot was being evaluated by the instructor in order to be authorized to utilize the airplane. Two of the maneuvers planned for the flight were "power on" and "power off" stalls. In addition, the passenger had completed a similar evaluation earlier in the afternoon with a different instructor, and had gone on the accident flight for additional familiarization.

According to a witness that was outside and within 0.5 mile of the accident site, the engine noise increased, and the airplane pitched up to the point that the witness thought the pilot was attempting a loop. The pitch up stopped, and the left wing dropped. The airplane rolled inverted and completed 5 "spirals," before impacting the ground. The witness added that he heard the engine "completely stop" about the third "spiral."

A review of radar data revealed a target near the accident site about the time of the accident. The target was maintaining a constant altitude of 3,400 feet msl, a constant groundspeed of 100 knots, and heading 170 degrees magnetic before starting to slow and descend. The first target deviation was a return at 3,300 feet msl, and 80 knots, with no heading data. The second was at 2,600 feet msl, and the third was at 1,800 feet msl. The time between returns was approximately 5 seconds, and no ground speed or heading data was recorded for the last two returns.

The accident occurred during the hours of daylight. The wreckage was located at 42 degrees, 40.871 minutes north latitude, 77 degrees, 36.945 minutes west longitude, and an elevation of approximately 1,875 feet msl.

PILOT INFORMATION

Flight Instructor

The instructor held a commercial pilot certificate with ratings for airplane single-engine-land, airplane multi-engine-land, and airplane instrument. He also held certified flight instructor ratings for airplane single-engine land, airplane multi-engine-land, and instrument airplane. On his last FAA first-class medical certificate, which was dated July 18, 2002, he reported a total flight experience of 815 hours.

A review of the instructor's logbook revealed the last entry was on March 29, 2003, and the instructor had a total flight experience of 1,097 hours. He had 45.8 hours in PA-28s, and the accident flight was his first in make and model. The pilot logged 30.7 hours in the previous 30 days from the last entry, and 89.1 hours in the previous 90 days. He conducted 1.0 hour of spin recovery training in a Cessna 152 on June 4, 2000, and 1.0 hour on September 13, 2000. His last flight review was completed on February 20, 2002, when he completed a multi engine land instructor flight evaluation in a Piper PA-34.

Pilot Receiving Instruction

The pilot held a private pilot certificate with an airplane single-engine-land rating. On his last FAA second-class medical certificate, which was dated January 25, 2002, he reported a total flight experience of 100 hours. According to the pilot's logbook, he had a total flight experience of 146 hours as of February 15, 2003.

AIRCRAFT INFORMATION

The airplane was manufactured in 1966. It was equipped with a 180-horsepower Lycoming IO-360-A3A engine, and a fixed pitch propeller. According to maintenance records, since the last annual inspection, which was completed on March 28, 2003, the airplane flew 15.06 hours, and in the 8 years proceeding the accident, the airplane flew a total of 30.82 hours.

METEOROLOGICAL INFORMATION

A weather observation was taken about 6 minutes before the accident at the Dansville Airport. The airport had a field elevation of 662 feet msl, and was located 10 miles to the south of the accident site. According to the observation, the wind was 330 degrees at 15 knots gusting to 20 knots, visibility was 10 miles, sky was clear, temperature was 54 degrees Fahrenheit, dew point was 34 degrees Fahrenheit, and the altimeter setting was 29.83 inches of mercury.

WRECKAGE AND IMPACT INFORMATION

Airframe

The debris path was located in a wooded area. It was approximately 110 feet long, and orientated on a magnetic heading of 191 degrees. The start of the debris path was marked by freshly broken tree branches at the top of several trees that were approximately 55 feet in height. The down angle from the start of the debris path to the main wreckage was approximately 30 degrees. Within the debris path, all the major structural components for the airplane were identified, along with all the flight control surfaces. All the fracture surfaces for both wings and tail section were gray in color and consistent with overload. Also in the debris path was a section of wood that was approximately 6 inches in diameter, and displayed a cut mark along its vertical axis that was approximately 1-foot long, 4 inches wide, and 1 inch deep. About 3 inches from the top of the cut was red transfer paint consistent in color and width with a red stripe painted on the tip of both propeller blades.

The main wreckage was comprised of the engine, cockpit, cabin, and empennage. The engine and forward section of the cockpit came to rest upside down, and the cabin, along with the empennage, came to rest upright. The carry through spar, along with both wings had separated from the main wreckage and were fragmented. The horizontal stabilator and vertical stabilizer were separated from the empennage and fragmented.

Aileron and elevator control continuity was confirmed from the control surfaces to the control column, but not to the individual pilot controls because of impact damage. The left aileron balance weight was separated from the aileron, the rivet holes were elongated, and the weight was not recovered. The right aileron balance weight was attached to the right aileron, and the stabilator balance weight was in place.

Rudder control continuity was confirmed from the rudder to the left and right rudder cable attachment arms. The left rudder cable attachment arm was separated from the rudder bar assembly at the attachment weld, and was retained for further examination. The right rudder cable attachment arm was separated from the rudder bar assembly about 0.25 inch from the attachment weld. The fracture surface was gray in color, and had a 45-degree shear lip.

Rudder trim position was undetermined because of impact damage, and elevator trim was approximately full nose down. Continuity of both trim systems was confirmed to the cockpit area, but not to the associated trim wheels because of impact damage. The flap handle was up, but flap position could not be determined because of impact damage.

The left and right fuel tanks were compromised. The left wing fuel tank plumbing was intact, the fuel screen was connected, and absent of debris. The right wing fuel tank plumbing was also intact, the fuel screen was connected, and absent of debris. Continuity from both fuel tanks to the fuel selector could not be confirmed because of impact damage. Continuity from the fuel selector to the electric driven fuel pump, and the engine driven fuel pump was confirmed. Continuity was also confirmed from both pumps to the carburetor.

The fuel selector was in the right tank position. The left inflow line was removed, and no fuel was identified. The right inflow line was removed and approximately 0.5 ounce of fuel was observed. The engine feed line was then removed and another 0.5 ounce of fuel was observed. With both observations, the fuel was bluish in color, and no contaminates were identified. To test the fuel selector, air pressure was applied to the right inflow port. With the right tank selected, air was identified coming from the engine outflow port, but not from the left tank inflow port. Air pressure was then applied to the left inflow port, and the fuel selector valve was placed in the left tank position. Air was identified coming from the engine outflow port, but not from the right tank inflow port.

In the cockpit, the throttle was out about 1.0 inch, the mixture control was destroyed, the primer was in and locked, and the carburetor heat was full forward. Engine control continuity was confirmed from the cockpit to the carburetor and carburetor heat box.

Engine

The airplane was equipped with a two bladed, fixed pitch propeller. The No. 1 propeller blade was bent aft, and the tip was curled back beyond the 90-degree mark. The No. 2 blade was bent aft approximately 5 degrees. No chordwise scratches, leading edge gouges, or "S" bends were identified on either of the propeller blades. The propeller and propeller flange had separated from the engine. The fracture surface was gray in color and consistent with torsional overload.

The fuel line to the carburetor was removed and a trace amount of fuel was identified. The carburetor displayed impact damage and was partially separated from its mount. The throttle was full open, the mixture was full rich, and the carburetor heat valve was in the cold position.

The top and bottom sparkplugs were removed and the electrodes examined. The No. 1 top was oiled soaked and absent of debris. The No. 2 top was dark gray and absent of debris. The No. 3 and No. 4 top were gray, and absent of debris. The No. 1 bottom was oil soaked and absent of debris. The No. 2 and No. 4 bottom were gray and absent of debris. The No. 3 bottom was oil soaked and absent of debris.

A rotational force was applied to the engine crankshaft via the vacuum pump drive gear. Compression was obtained on all four cylinders, the accessory drive gears rotated, the engine driven fuel pump piston actuated, and the left magneto ignition leads produced spark. The right magneto was partially separated from the accessory section and was removed. A rotational force was applied to the input drive, and spark was observed on all the ignition towers. For testing purposes, the engine driven fuel pump intake port was submerged in water, the pump was manually activated, and water was expelled via the outflow port. The vacuum pump shear coupling was intact, and the pump produced suction when a rotational force was applied to the input drive.

ADDITIONAL INFORMATION

The wreckage was released, minus a handheld GPS, and a section of the rudder bar assembly to the owner's