# NTSB LAX07LA122: Scottish Bulldog 120, N706X, So Lake Tahoe, CA, April 8, 2007 - Type: NTSB accident investigation - Classification: Accident · Fatal · Limited investigation · Final report - Date: April 8, 2007, 16:45 local (23:45 UTC) - Place: So Lake Tahoe, CA - Coordinates: 38.739444, -120.023056 - Nearby events: https://openairdocs.org/map.md?lat=38.7394&lon=-120.0231&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Fatal - Injuries: 1 fatal, 1 serious - Status: Completed, report July 30, 2008 - Report: Approved by Office Director - Parties: Textron Lycoming, Federal Aviation Administration - NTSB case key (mKey): 65557 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX07LA122 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/65557/pdf - Page: https://openairdocs.org/ntsb/LAX07LA122 ## Probable cause The pilot's failure to maintain clearance from objects and the mountainous terrain. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight collision with object, climb - to cruise - object - tree(s) - clearance - not obtained/maintained, pilot in command (cause) - terrain condition - mountainous/hilly ## Analysis The pilot and his passenger departed for a flight across the Sierra Nevada mountain range to a destination on the California coast. According to the surviving passenger, the pilot intended to follow a highway through the mountains; however, he experienced difficulty in climbing high enough to clear the terrain. He elected to circle, to gain sufficient altitude to pass over a mountain summit. During the circling climb, the pilot flew south into even higher mountainous terrain. The airplane was unable to climb or maintain altitude, and struck a tree with the right wing. The airplane came to rest inverted in a pasture. No evidence was found of a preimpact mechanical malfunction or failure during examination of the airframe and engine. ## Factual narrative On April 8, 2007, about 1645 Pacific daylight time, a Scottish American Bulldog 120, N706X, collided with a tree near South Lake Tahoe, California. The pilot/owner was operating the airplane under the provisions of 14 Code of Federal Regulations (CFR) Part 91. The private pilot was killed, and one passenger sustained serious injuries. The airplane sustained substantial damage to the wings and fuselage. The cross-country personal flight departed South Lake Tahoe about 1630 with a planned destination of Palo Alto, California. Visual meteorological conditions prevailed, and no flight plan had been filed. Local authorities received reports of an emergency locator transmitter (ELT) signal. They began a search, and discovered the wreckage of the inverted airplane. They observed footprints in the snow leading away from the wreckage, and found a female survivor about 1 mile away. The Federal Aviation Administration accident coordinator interviewed the survivor. She stated that they departed runway 18 at South Lake Tahoe airport (TVL) under visual flight rules to Palo Alto (PAO). Prior to departure, the pilot had the airplane fueled to capacity, 32 imperial gallons (38.4 us gallons). The pilot intended to follow highway 50 through the mountains; however, he experienced difficulty in climbing from Lake Tahoe. He elected to circle over Meyers, California, to gain sufficient altitude to pass over Echo Summit. During the circling climb, the pilot flew south of Meyers into even higher mountainous terrain. The passenger stated that the airplane was unable to climb or maintain altitude, and struck a tree with the right wing. The airplane came to rest inverted in a pasture. The retriever cut all empennage control cables aft of the cabin during retrieval. The airplane had nosed over, the cabin had buckled, and the lower half of the fuselage separated at this point. All control cables were connected to their respective control surfaces. The elevators remained attached to the horizontal stabilizers; the rudder remained attached to the vertical stabilizer. The rudder and vertical stabilizer exhibited downward crush, and buckled at their midpoint. Investigators from the National Transportation Safety Board and Textron Lycoming examined the wreckage at Plain Parts, Sacramento, California, on July 23, 2007. Investigators removed the engine. They slung it from a hoist, and removed the top spark plugs. All spark plugs exhibited no mechanical deformation. The spark plug electrodes were oval. Spark plugs numbers one, two, and three were oily. All electrodes were gray, which corresponded to normal operation according to the Champion Aviation Check-A-Plug AV-27 Chart. A borescope inspection revealed no mechanical deformation on the valves, cylinder walls, or internal cylinder head. The oil sump screen was clean. Investigators manually rotated the crankshaft with the propeller. 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, and the fuel pump plunger moved up and down. Investigators obtained thumb compression on all cylinders in firing order. The timing was at 20 degrees before top dead cylinder of the number one cylinder. Investigators manually rotated the magnetos, and both magnetos produced spark at all posts. The rubber diaphragm in the fuel distribution valve was unbroken, and investigators did not observe any contamination. The fuel nozzles were open. Investigators removed the fuel pump, and drained a clear blue fluid that smelled like aviation gasoline. They manually manipulated its operating arm, and it moved freely. They disassembled the pump, and the diaphragm was unremarkable. The fuel selector valve was in the main position. The right wing separated from the aileron outboard. The spar bent aft at the fracture surface, which was angular and irregular. The retriever cut the control cables. About 2 feet inboard of the wing tip, the leading edge had an 18-inch semicircular crush depression that went aft about 18 inches. The left wing separated at the front attachment point bolthole; the fitting bent aft, and the outboard section sheared along an angular plane. The retriever cut the wings off. Investigators moved the cut aileron and elevator control cables, and the control stick and control surfaces moved in the corresponding direction. Both propeller blades bent aft about 20 degrees at midspan, and twisted toward the low pitch, high revolution per minute (rpm) position. The FAA Forensic Toxicology Research Team, Oklahoma City, Oklahoma, performed toxicological testing of specimens of the pilot. Analysis of the specimens contained no findings for carbon monoxide, cyanide, volatiles, and tested drugs. ## Aircraft - Registration: [N706X](https://openairdocs.org/deregistered/N706X-2013-11-07), registration cancelled 2013-11-07, S/N BH120/355, built 1974 (OpenAirDocs) - Reported make and model: Scottish Aviation Bulldog 120 - Registry model: [Scottish BULLDOG MDL 120/121](https://openairdocs.org/model/scottish-bulldog-mdl-120-121) (registry code 8060103) (OpenAirDocs) - Registry engine: [Lycoming IO-360-A1B6D](https://openairdocs.org/engine/lycoming-io-360-a1b6d) (registry code 41593, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: BH 120/355 - Airframe hours: 8400 - Engines: Lycoming IO-360-A1B6D 200 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Arnon Matityahu - Airworthiness certificate: Special, Experimental (Special) - Departed: TVL, So Lake Tahoe, CA - Destination: PAO, Palo Alto, CA ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 49; injuries: fatal; private; airplane ratings: single-engine land, multi-engine land; medical: class 3; last flight review January 1, 2006; seat: left; toxicology performed; flight hours: 379 total, 7 in this make and model, 248 as pilot in command, 0 in the last 90 days, 0 in the last 30 days, 0 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 190° at 16 knots, gusting 22 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 55 °F, dew point 34 °F - Altimeter: 29.93 inHg - Observed at: TVL ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20070408006219A](https://openairdocs.org/incident/20070408006219A), Apr 8, 2007: Amtr BULDOG120121, South Lake Taho, CA, Destroyed, 1 fatal. (-23) The pilot and his passenger departed runway 18 at south lake tahoe airport (tvl) on a VFR flight to polo alto airport (pao). Prior to departure, the… From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.