# NTSB CEN14LA273: Beech H35, N653T, Monroe, LA, June 3, 2014 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: June 3, 2014, 10:55 local (15:55 UTC) - Place: Monroe, LA - Coordinates: 32.528331, -92.037223 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=32.5283&lon=-92.0372&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Defining event: [Approach: Unknown or undetermined](https://openairdocs.org/ntsb-events/000) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report May 16, 2016 - Report: Approved by Office Director - NTSB office: Central Region - Parties: FAA FSDO, Continental Motors, Textron Aviation - NTSB case key (mKey): 89337 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN14LA273 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/89337/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=89337 - Page: https://openairdocs.org/ntsb/CEN14LA273 ## Probable cause The loss of engine power for reasons that could not be determined because postaccident examination of the airframe and engine did not reveal any anomalies that would have precluded normal operation. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [Beech H35, 3 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=1151520), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md) - [Object/animal/substance: tree(s)](https://openairdocs.org/ntsb-findings/03022020): Environmental issues › Physical environment · Contributed to outcome; cases with it: [Beech H35, 1 case](https://openairdocs.org/ntsb-findings/03022020/cases.md?model=1151520), [All aircraft, 933 cases](https://openairdocs.org/ntsb-findings/03022020/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Approach: Unknown or undetermined](https://openairdocs.org/ntsb-events/000) (defining event); cases with it: [Beech H35, 3 cases](https://openairdocs.org/ntsb-events/000/sequence.md?model=1151520), [All aircraft, 1,703 cases](https://openairdocs.org/ntsb-events/000/sequence.md) - [Approach: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341); cases with it: [Beech H35, 7 cases](https://openairdocs.org/ntsb-events/341/sequence.md?model=1151520), [All aircraft, 3,820 cases](https://openairdocs.org/ntsb-events/341/sequence.md) - [Emergency descent: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Beech H35, 8 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=1151520), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The commercial pilot was conducting a maintenance test flight. According to Federal Aviation Administration audio files, the pilot reported to an air traffic controller that the airplane was experiencing an unspecified fuel problem. The engine then experienced a total loss of power, and the pilot conducted a forced landing, during which the airplane collided with a tree and then impacted a parking lot. A postaccident examination of the airframe, engine, and fuel system did not reveal any preimpact anomalies that would have precluded normal operation. A review of data obtained from the airplane's engine data monitoring system did not reveal any unusual engine readings before the loss of engine power. At the accident site, fuel was drained from each wing tank and a fuel line leading to the engine; the fuel from the fuel line was orange. Testing of the orange fuel sample revealed the presence of silicon. The tank seals and lines were intact, and the source of the silicon could not be determined. No silicon nor any white powdery deposits (the expected combustion byproducts of silicon) were found on any of the engine components. The reason for the loss of engine power could not be determined. ## Factual narrative On June 3, 2014, about 1055 central daylight time, a Beech H35 airplane, N653T, impacted a parking lot following a total loss of engine power near Monroe, Louisiana. The commercial pilot was seriously injured and the airplane was substantially damaged. The airplane was registered to WFO Flying Services, and operated by a private individual under the provisions of 14 Code of Federal Regulations Part 91 as a maintenance test flight. Visual meteorological conditions prevailed for the flight, which operated with a flight plan. The local flight originated from Monroe Regional Airport (KMLU), Monroe, Louisiana, about 1020.The airplane was co-owned by the accident commercial pilot and another pilot. They acquired the airplane in March 2013. Months prior to the accident, the airplane had been mistakenly fueled with Jet-A by the other pilot. Data obtained from the onboard JPI engine data monitoring (EDM) system found that on November 1, 2013, the engines cylinder head temperatures (CHT) increased about 460° F several times during the flight. The airplane landed at KMLU and it was repaired. An invoice from the repair facility stated that the fuel tanks were drained and mechanics "flushed 5 gallons through fuels to clear them of contamination." The engine was removed, repaired, and reinstalled on the airplane. The engine's fuel hoses were also replaced. Work was completed on the airplane on June 2, 2014. On the day of the accident, the airplane departed KMLU for a maintenance test flight flown by the accident commercial pilot/co-owner. The pilot reported an unspecified fuel malfunction before the engine experienced a total loss of engine power. During the forced landing, the airplane collided with a tree and impacted a parking lot. The cockpit was distorted and crushed aft. The airplane's right wing sustained more damage when compared to the left wing. The outboard portion of the right wing was torn outboard of the landing light. The fuselage was wrinkled and distorted. At the accident site, fuel was drained from each tank and from a fuel line leading to the engine. The fuel pulled from the fuel line leading to the engine was light orange in color. The fuel samples pulled from the fuel tanks appeared in color and clarity with 100 low lead fuel. The orange colored fuel was sent for fuel testing. Gas chromatograph mass spectrometer testing was conducted on the orange colored fuel sample. The testing's certificate of analysis noted "if heavier compounds or polymers are present these were not seen on the gas chromatograph mass spectrometer. Testing found the presence of silicon in the quantity of 12.9 mg/kg. An examination of the airframe and engine was conducted at a salvage facility. No preimpact anomalies were detected with the airframe or the fuel tanks. The fuel lines and fuel screens were all found clear and unobstructed. The engine examination did not detect any preimpact anomalies. No silica or white powdery deposits were noted in the fuel divider,cylinders, or spark plugs. Data obtained from the JPI EDM, found that on the day of the accident, data for the accident flight began at a JPI EDM time of 1437:44. At 1517:20 EDM time, the engine's CHTs averaged 373° F and the exhaust gas temperatures (EGTs) averaged 1412° F. Within 6 seconds the EGTs averaged 780° F and continued to decay. About 2 minutes later, the EDM recorded "NA" values for several values. Reliable scientific data does not exist to determine a level of silicon contamination prior to obstruction of an airplane's engine performance. ## Aircraft - Registration: [N653T](https://openairdocs.org/deregistered/N653T-2018-03-06), registration cancelled 2018-03-06, S/N D-4998, built 1957 (OpenAirDocs) - Reported make and model: BEECH H35 - Registry model: [Beech H35](https://openairdocs.org/model/beech-h35) (registry code 1151520) (OpenAirDocs) - Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: D-4998 - Year built: 1957 - Airframe hours: 5475.13 - Engines: Continental O-470-G-CI 240 horsepower reciprocating - Damage: Substantial damage - Flight: Flight test, Part 91 - Operator: Private individual - Registered owner: Wfo Flying Service - Airworthiness certificate: Standard, Normal - Last inspection: Annual, July 19, 2013 - Departed: MLU, Monroe, LA - Destination: MLU, Monroe, LA - Airport: MLU, Monroe Regional, runway 18, 5,001 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 41; injuries: serious; commercial; airplane ratings: single-engine land; medical: class 2, with waivers/limitations; seat: left ## Weather - Conditions: Visual (VMC), Day - Wind: variable at 3 knots - Visibility: 10 statute miles - Lowest ceiling: 2,200 ft broken - Temperature: 82 °F, dew point 70 °F - Altimeter: 30.06 inHg - Observed at: KMLU ## 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 20140603012589A](https://openairdocs.org/incident/20140603012589A), Jun 3, 2014: Beech H35, Monroe, LA, Destroyed. The morning of the accident, the pilot reported having a fuel problem. A minute later, the pilot reported he was going into the trees. The aircraft hit a power… ## Docket (7 files) The files NTSB released with the investigation on March 7, 2016, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=89337. 4.8 MB in all. - Pictures of fuel found at the scene (item 1, .PDF, 2 photos, 1.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40437310&FileExtension=.PDF&FileName=Pictures%20of%20fuel%20found%20at%20the%20scene-Master.PDF - Pictures of airplane examination (item 2, .PDF, 5 photos, 2.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40437311&FileExtension=.PDF&FileName=Pictures%20of%20airplane%20examination-Master.PDF - Flight Data Recorder - Electronic Data Monitor (item 3, .PDF, 301 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40437312&FileExtension=.PDF&FileName=Flight%20Data%20Recorder%20-%20Electronic%20Data%20Monitor-Master.PDF - Flight Data Recorder - Electronic Data Monitor Attachment 1 (item 4, .PDF, 77 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40437313&FileExtension=.PDF&FileName=Flight%20Data%20Recorder%20-%20Electronic%20Data%20Monitor%20Attachment%201-Master.PDF - Certificate of Fuel Analysis (item 5, .PDF, 395 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40437314&FileExtension=.PDF&FileName=Certificate%20of%20Fuel%20Analysis-Master.PDF - Work Invoice (item 6, .PDF, 230 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40437315&FileExtension=.PDF&FileName=Work%20Invoice-Master.PDF - Radio Transmissions excerpt (item 7, .PDF, 52 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40439347&FileExtension=.PDF&FileName=Radio%20Transmissions%20excerpt-Master.PDF 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.