LAX06FA075
LAX06FA075

HISTORY OF FLIGHT

On December 31, 2005, about 0800 Pacific standard time, a Beech V35A, N7944R, collided with terrain following a loss of control during the takeoff/initial climb near Valley Center, California. The private pilot/owner was operating the airplane under the provisions of 14 CFR Part 91. The pilot and two passengers sustained fatal injuries; the airplane was destroyed. The personal cross-country flight was departing from Blackington Airpark, a private airfield, with a planned destination of Borrego Springs, California. Visual meteorological conditions prevailed, and no flight plan had been filed. The approximate global positioning system (GPS) coordinates of the primary wreckage were 33 degrees 15 minutes north latitude and 117 degrees 06 minutes west longitude.

The pilot's airplane was the last of five airplanes that were traveling to another airport for an overnight trip. Witnesses observed the takeoff, and reported that they heard a loud bang as the airplane reached about 800 feet above ground level (agl). They observed the airplane roll once or twice as the nose went down.

The airplane came to rest with the tail in an avocado tree.

PERSONNEL INFORMATION

A review of Federal Aviation Administration (FAA) airman records revealed that the pilot held a private pilot certificate with ratings for airplane single engine land and multiengine land. The pilot held a third-class medical certificate issued on September 1, 2004. It had no limitations or waivers.

An examination of the pilot's logbook revealed no entries after 1999. FAA records showed that the pilot reported a total flight time of 2,875 hours on his application for his medical certificate.

AIRCRAFT INFORMATION

The airplane was a Beech V35A, serial number D-8961. A review of the airplane's logbooks revealed that the airplane had a total airframe time of 4,233 hours at the last annual inspection on March 1, 2005. The tachometer read 979.04 at the last inspection.

The engine was a Teledyne Continental Motors TSIO-520-D, serial number 156128-8-D. It had 979 hours since major overhaul at the annual.

AIRPORT INFORMATION

The Airport/ Facility Directory, Southwest U. S., indicated that runway 17 was 2,200 feet long and 50 feet wide. The runway surface was asphalt. All landings were on runway 35 and all takeoffs were on runway 17. The runway sloped uphill to the north.

WRECKAGE AND IMPACT INFORMATION

The FAA accident coordinator examined the wreckage at the accident scene. He reported that the airplane came to rest at the edge of a driveway with the forward portion of the empennage hanging down vertically from branches of an avocado tree.

The propeller separated and was partially buried; it was not charred.

The orientation of the fuselage was 360 degrees.

MEDICAL AND PATHOLOGICAL INFORMATION

The San Diego County Coroner completed an autopsy.

TESTS AND RESEARCH

The FAA, Raytheon Aircraft Company, and Teledyne Continental Motors (TCM) were parties to the investigation.

Investigators examined the wreckage at Eastman Aircraft, Corona, California, on January 4, 2006.

The left side of the airframe sustained more fire damage than the right side. Most of the cabin, left wing, fuselage, and inboard half of the right wing were not distinguishable within the wreckage. The left ruddervator was charred, and a few feet of the inboard leading edge was missing. The inboard and forward third of both the top and bottom of the right ruddervator was discolored, and exhibited some wrinkles and tears.

The recovery agent cut all of the empennage control cables during recovery. Investigators established control continuity from the right aileron to the wing root. They found several sections of unidentified cable. They could not identify any control cables for the left aileron. The control cables remained attached to the elevator portion of the control column. Cables remained attached to the forward rudder bellcrank. Cables remained connected to the ruddervators and the elevator trim tabs. All identifiable cable pieces that were not cut during recovery were broomstrawed.

Investigators removed the engine. They slung it from a hoist, and removed the top spark plugs. All spark plugs were clean and circular with no mechanical deformation except for the lower No 1. The spark plug electrodes were gray.

Investigators manually rotated the crankshaft. The crankshaft rotated freely, and the valves moved approximately the same amount of lift in firing order. The gears in the accessory case turned freely. Investigators obtained thumb compression on all cylinders in firing order.

A borescope inspection revealed no mechanical deformation on the valves, cylinder walls, or internal cylinder head. The piston heads and valve heads had light deposits.

The oil pump had light scratches in the cavity. The gear teeth showed some wear.

Investigators rotated both magnetos manually. The left magnet separated from the engine, and had exterior mechanical damage. It did not sound like the right magneto when rotated, and produced no spark at any terminal. Disassembly revealed that the interior was moist. After drying the inside, the magneto sparked on all terminals. The right magneto remained attached to the engine, and produced spark on all terminals.

There were two vacuum pumps. One vacuum pump separated and burned. The other vacuum pump drive gear remained unbroken, but the vacuum pump would not turn.

The cover for the fuel selector valve was mechanically damaged, and the cutout was elongated to the 2-oclock position. The selector indicated between positions. Investigators removed the cover and noted that the selector was in a detent. They turned the selector, and it moved freely between the detents. They connected a hose to the line and blew through the hose after selecting all of the different positions. Air flowed freely with no leaks except for the off position. A review of a schematic of the fuel system determined that the selector was to the auxiliary position.

The oil sump screen was clean. Investigators peeled half of the oil filter open, and that section was clean.

The engine driven fuel pump drive gear was undamaged, and the pump rotated freely. When submerged in a fluid and rotated with a drill, it pumped the fluid.

Investigators disassembled the fuel manifold valve. The screen, interior, and the line going to the pressure gauge had a thin coating of a viscous amber substance that had a strong, foul odor. The substance did not clog the valve or screen. The fuel nozzles were open.

The turbocharger wastegate was open, and the compressor and turbine turned freely. The TCM representative moved the wastegate valve assembly by hand and felt resistance from the springs.

The airframe manufacturer's representative determined that the landing gear were up. The flap actuator split apart. The elevator trim measured 0.090 inches; the representative determined that this equated to 0-5 degrees tab up.

The spinner was crushed aft, and did not exhibit rotational scoring. One blade remained straight, and did not have any scratches or gouges. The other two blades bent aft and were loose in the hub. One of these blades had a 3/8-inch nick on the cambered side about 6 inches from the tip. The third blade did not have any gouges or scrape marks.

ADDITIONAL INFORMATION

A specialist in the Safety Board's Materials Laboratory examined the viscous amber substance in the fuel manifold valve. The complete report is part of the public docket. Pertinent parts of the report follow.

The specialist investigated the elemental composition of a sample of the residue by using X-ray energy dispersive spectroscopy in the scanning electron microscope. A representative spectrum indicated major peaks for carbon, sulfur, and chlorine, with smaller peaks for aluminum and silicon.

The specialist sent a sample of the residue to an outside laboratory to identify the organic composition of the residue by means of gas chromatography with a mass spectrometer detector (GC/MS). The report from the outside laboratory is appended to this report. The outside laboratory was subsequently asked to compare the GC/MS spectrum from the residue with the GC/MS spectrum from a sample of 100 LL fuel. Two further pages comparing total ion chromatograms from the residue (prepared by solvent dilution) and the 100 LL fuel (labeled in the figures as AVGAS) are also appended to this report. An email from the outside laboratory referring to the comparison between the residue and the 100 LL fuel stated, "The boiling ranges are significantly different."

Service Information Letter SIL99-2B from Teledyne Continental Motors, Inc., (issued 3/29/1999, revised 10/17/2005) lists authorized sealants, lubricants, adhesives and fuel additives. Only two allowable fuel additives are listed: (1) Isopropyl Alcohol not to exceed 3 percent of the total, and (2) Diethylene Glycol Monomethyl Ether conforming to MIL-DTL-85470B if approved by the aircraft manufacturer and not to exceed 0.15 percent by volume. Neither of these compounds was identified in the GC/MS spectra from the residue. Threaded fittings in the fuel injection system were to be sealed with a methacrylate ester based adhesive. The Material Safety Data Sheet for the adhesive lists four components: Polyglycol dimethacrylate (CAS 25852-47-5), Polyglycol dioctanoate (CAS 18268-70-7), Poly[butyl methacrylate] (CAS 9011-53-4), and Cumene hydroperoxide (CAS 80-15-9); none of which were identified in the GC/MS spectra from the residue.

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