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Sat, Nov 03, 2012

NTSB Issues Factual Report On Wright B Flyer Accident

Two Pilots Aboard The Replica Were Fatally Injured

The NTSB has released its factual report in an accident of a replica Wright B Flyer, which went down July 30th, 2011 during a test flight.

According to the report, the Wright B Flyer experimental amateur-built airplane, N453WB, impacted terrain during a forced landing near Springfield, Ohio. The two commercial pilots sustained fatal injuries. The airplane sustained substantial wing and fuselage damage. The airplane was registered to and operated by Wright B Flyer Inc. under the provisions of 14 Code of Federal Regulations Part 91 as a test flight. VFR conditions prevailed for the flight, which did not operate on a VFR flight plan. The local flight originated from the Springfield-Beckley Municipal Airport (KSGH), near Springfield, Ohio, approximately 1008 EDT.

The operator’s accident report, in part, stated:

"This experimental airplane was involved in the initial phases of flight testing. Flying qualities, stability and control and performance were being tested. Depending on the weather conditions test points were selected from a flight test matrix. The pilots, always two in the aircraft, would brief the flight, fly the test points and document the results.

Depending on how well the test conditions were met the pilots would show that test point as complete and select another test to fly. The morning of the accident the pilots brief was not attended by any other person; exactly what points they were testing is not known."

According to statements given by witnesses in the area, the airplane's engine sounded like its rpm varied. The airplane was observed to be flying slow and to bank to the left and right. One witness reported that the airplane spiraled downward.

The pilot in the right seat, age 64, held a commercial pilot certificate with an airplane single engine land, multi-engine land, and instrument airplane ratings. He was issued a second-class airman medical certificate on March 23, 2011, with a limitation for corrective lenses. According to the operator, he accumulated 3,078 hours of total flight time and 235 hours of flight time in the same make and model airplane as the accident airplane.

The pilot in the left seat, age 73, held a commercial pilot certificate with an airplane single engine land, multi-engine land, airplane single engine sea, and instrument airplane ratings. He was issued a second-class airman medical certificate on March 09, 2011, with a limitation for corrective lenses. According to the operator, he accumulated 955 hours of total flight time and 68 hours of flight time in the same make and model airplane as the accident airplane.

N453WB, serial number 002, was a Wright B Flyer Inc. plans-built antique replica Wright B Flyer experimental amateur-built airplane. According to the builder’s web site, the airplane had modern airfoils, conventional ailerons, steel tube structure, and modern aircraft fabric. A four-cylinder, 205-horsepower Lycoming HIO-360-C1B engine, with serial number L-13374-51A, powered the airplane. The airplane was equipped with two chain-driven, counter-rotating, two-blade Sensenich pusher propellers. The airplane had seating for two occupants. The airplane was equipped with dual controls. The airplane had a wingspan of 33 feet 6 inches, a height of 7 feet 8 inches, and a length of 26 feet. The airplane’s empty weight was 1,876 pounds and its gross weight was 2,650 pounds. The demonstrated takeoff speed was listed as 55 mph. The airplane had accumulated 58 hours of total time at the time of the accident and had accumulated 28.8 hours of Phase I flight time.

According to a pilot flying inbound to KSGH, he made a position report on the KSGH common traffic advisory frequency (CTAF) and a pilot representing the Wright B Flyer answered back on the CTAF indicating the Wright B Flyer was in a racetrack pattern at 3,100 feet above mean sea level about three to four miles south of SGH making east - west circuits. The inbound pilot practiced a touch and go at KSGH and subsequently heard a call that indicated the Wright B Flyer was landing in a field five miles north of SGH. He said the pilot sounded calm. He asked the Wright B Flyer if he could be of any assistance and got no reply. He then heard two garbled transmissions that said something about a "chase car". He flew three to seven miles north of SGH to look for the aircraft based on the radio call.

The airplane was equipped with an engine monitor. The airplane's engine monitor and a recovered global positioning system (GPS) device were shipped to the National Transportation Safety Board Recorder Laboratory (NTSB) for readout. A secure data (SD) memory chip from an on-board Contour video camera was located on-scene following the recovery of the wreckage and that SD chip was also shipped to the NTSB Recorder Lab for readout.

The recovered engine monitor was a Dynon EMS-D10 model, serial number 001502, which was a cockpit instrument that graphically displayed engine information to the pilot using a six-inch liquid crystal display. The unit can display engine rpm, cylinder head temperature (CHT), exhaust gas temperature (EGT), oil pressure, oil temperature, battery voltage, fuel flow, engine manifold pressure (MAP), fuel pressure, and aircraft fuel quantity. The unit can record that data on a flash memory chip located on its main printed circuit board. This data is typically recorded at a rate of once per second.

The recovered GPS device was a Garmin GPSMAP 196 model, serial number 65410637, which was a portable GPS unit equipped with a detachable antenna, and a 320 x 240 12-level grayscale liquid crystal display. The unit was capable of storing date, route of flight, and flight time information for up to 50 individual flights in the form of a flight log. Flight logging began when the GPS unit senses a speed increase to greater than 30 knots together with an altitude gain of greater than 500 feet. Recorded flight log data was saved when the speed is sensed to decrease to below 30 knots, and a new log is started if more than 10 minutes passes from this time. All recorded data was stored in non-volatile flash memory.

The Contour high definition (HD) Video camera was a consumer grade HD adventurer recorder which was ruggedized and water resistant. It was powered by an internal rechargeable battery and recorded the video and audio information to a removable mini-SD memory card. The camera can record at various resolution, frame rates, and recording duration prior to using the camera. Additionally, the camera had a three-position selection switch which permitted the user to select one of three pre-defined recording resolutions at the time of use. There also was a recorder power switch and a switch to start and stop the recording. The camera buffers approximately 10 to 20 seconds of data prior to writing it to the memory card. During normal shutdown, this buffer gets flushed and no loss of data occurs. During an abnormal shutdown, the memory buffer’s information is lost. Depending on when the recording ends in relation to this buffer cycling, you may lose some portion of the recording when the unit does not have a chance to write the contents of the buffer to the SD memory card. This camera was connected to the airplane’s audio/intercom panel and it could record audio alarms, radio conversations, and pilot-to-pilot intercom conversations.

The airplane was located by first responders in a field about one-half mile northwest of the intersection of South Pitchin Road and North River Road. The airplane had a resting magnetic heading of about 210 degrees. The top wing was found displaced forward and deformed downward over the forward portion of the lower wing and engine. The lower forward empennage tubing was buckled and the empennage was bent downward.

An on-scene examination of the wreckage was conducted. A liquid consistent with the smell of aviation gasoline was found in the bottom of the left fuel tank. The right fuel tank and the header tank were compromised and no fuel was found in those tanks. The fuel tank selector valve had the right fuel tank selected. When electric power was applied, the electric fuel pump emitted drops of a liquid consistent with the smell of aviation gasoline. Flight control cables and linkages were traced and all breaks were consistent with overload. Engine control cables were traced and all breaks were consistent with overload. The left magneto sustained damage and was not able to be tested. The right magneto sustained damage and it produced spark from its center electrode when it was rotated. The top spark plugs were removed. The sparkplugs were gray in color and no anomalies were detected. The engine driven fuel pump was torn off its base.

A disassembly of the engine driven fuel pump revealed no pre-impact anomalies. The fuel injection distribution valve was disassembled and no anomalies were detected. The engine exhibited a thumb compression at all cylinders. The fuel servo sustained damage and its mixture control shaft had separated outboard of its mixture control stop. The hose to the fuel servo screen contained drops of a liquid consistent with the smell of aviation gasoline. The fuel servo screen was free of debris. The oil filter canister was removed and no debris was observed.

Subsequent to the on-scene examination, the propeller shafts were examined by FAA inspectors and the left propeller shaft tube exhibited a separation at its aft weld. The left and right propeller shafts were shipped to the NTSB Materials Laboratory for detailed examination. Review of the cockpit video revealed that the airplane yawed near the end of the recorded video. This observation precipitated a follow up examination of the propeller shafts, which revealed the weld failure.

An autopsy was performed on both pilots by the Montgomery County Coroner's Office. The cause of death for both pilots was listed as blunt force injuries. The FAA Civil Aerospace Medical Institute prepared a Final Forensic Toxicology Accident Report on both pilots. The report on the left seat pilot was negative for the tests performed.

The report on the right seat pilot indicated that the pilot’s toxological sample was putrefied, and, in part, stated:

  • 11 (mg/dL, mg/hg) ETHANOL detected in Muscle
  • NO ETHANOL detected in Brain
  • Metoprolol detected in Liver
  • Metoprolol detected in Kidney

The FAA Forensic Toxicology Web Drugs website description of Metoprolol, in part, stated that Metoprolol “is a beta-adrenergic receptor antagonist, ‘beta blocker,’ used in the treatment of hypertension and certain arrhythmias.”

FMI: www.ntsb.gov

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