# NTSB ERA10LA499: Bell OH-58A, N132HD, Taylorsville, MS, September 24, 2010 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: September 24, 2010, 12:45 local (17:45 UTC) - Place: Taylorsville, MS - Coordinates: 31.813333, -89.419998 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=31.8133&lon=-89.4200&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Defining event: [Maneuvering-low-alt flying: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report July 18, 2011 - Report: Approved by Office Director - NTSB office: Eastern Region Aviation - Parties: FAA/FSDO, Parker Hannifin Corporation, Rolls-Royce, Bell Helicopter - NTSB case key (mKey): 77392 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ERA10LA499 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/77392/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=77392 - Page: https://openairdocs.org/ntsb/ERA10LA499 ## Probable cause A total loss of engine power while maneuvering at low altitude for undetermined reasons. ## 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: [Bell OH-58A, 8 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=1181579), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Maneuvering-low-alt flying: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) (defining event); cases with it: [Bell OH-58A, 5 cases](https://openairdocs.org/ntsb-events/341/sequence.md?model=1181579), [All aircraft, 3,820 cases](https://openairdocs.org/ntsb-events/341/sequence.md) - [Emergency descent: Off-field or emergency landing](https://openairdocs.org/ntsb-events/440); cases with it: [Bell OH-58A, 8 cases](https://openairdocs.org/ntsb-events/440/sequence.md?model=1181579), [All aircraft, 3,365 cases](https://openairdocs.org/ntsb-events/440/sequence.md) - [Emergency descent: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Bell OH-58A, 12 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=1181579), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The helicopter pilot was surveying a field in preparation for aerial application. While he was maneuvering the helicopter about 100 feet above the ground, the engine lost all power without warning. The pilot noticed a space in between the trees and attempted to autorotate to that spot, but the helicopter impacted trees nearby. A postaccident examination of the wreckage revealed 16 gallons of fuel remained in the helicopter and no fuel contamination was observed. A successful test-run of the engine was subsequently performed. Examination of the fuel boost pump revealed that the inlet shut-off valve arm was bent, which could restrict fuel flow. When power was applied to the pump, it pumped fuel from a bucket; however, it did not appear to pump the fuel at maximum capacity. Further testing was performed utilizing both the bent arm and a replacement stock arm. The test results were similar for both arms, which were both below the pump's flow requirements. The bent arm was re-installed and a third examination was conducted at the pump manufacturer's facility, which revealed that the pump's ring tong terminals and pump cartridge were the incorrect models for the fuel boost pump; however, during the third test, the pump passed flow tests as received, and flow improved when the inlet valve stem assembly and cartridge were replaced. The bent inlet shut-off valve arm and/or incorrect fuel boost pump assembly could have resulted in a total loss of engine power; however, the investigation could not determine what, if any, effect they had on the helicopter at the time of the accident. ## Factual narrative On September 24, 2010, about 1245 central daylight time, a Bell OH-58A helicopter, N132HD, operated by Cahaba Forestry Services, was substantially damaged during a forced landing into trees, following a total loss of engine power while surveying an area for spraying near Taylorsville, Mississippi. The certificated commercial pilot incurred serious injuries. The aerial application flight was conducted under the provisions of 14 Code of Federal Regulations Part 137. Visual meteorological conditions prevailed and no flight plan was filed for the local flight, which had departed a nearby field. The pilot reported that he was flying at 100 feet above ground level, at 57 knots, when the engine lost all power without warning. The pilot saw a hole in the trees at his 2 o'clock position and attempted to autorotate to that spot; however, the helicopter impacted trees. During the impact, the tailboom separated, a main rotor blade separated, and the fuselage was substantially damaged. According to a Federal Aviation Administration (FAA) inspector, during a postaccident wreckage examination, impact signatures observed on the rotor blades and transmission were not consistent with high engine power or rotor rpm at impact. The inspector drained about 16 gallons of fuel from the wreckage, including fuel in the fuel line to the fuel nozzle. No visible contamination was observed in the drained fuel. The pilot, age 46, held a commercial pilot certificate, with a rating for rotorcraft helicopter. He also held a private pilot certificate, with a rating for airplane single-engine land. The pilot reported a total flight experience of 10,000 hours; of which, 8,000 hours were in helicopters and 800 hours were in the same make and model as the accident helicopter. His most recent FAA second-class medical certificate was issued on June 14, 2010. The helicopter was originally manufactured in 1973 by Bell Helicopter and delivered to the U.S. Army. The helicopter subsequently received a restricted type certificate from Garlick Helicopters in 1997. It was equipped with a Rolls Royce (Allison) T63-A-720, 420-shaft horsepower engine. At the time of the accident, it was registered with the FAA in the restricted category and used for aerial application. The helicopter's most recent 100-hour inspection was completed on May 17, 2010. At that time the helicopter had accrued about 8,911 total hours of operation and the engine had accumulated 329 hours since overhaul. The helicopter had flown 119.7 hours since the last inspection. The helicopter was recovered to a hangar. The fuel boost pump was removed from the helicopter and examined under the supervision of an FAA inspector. In addition to providing added fuel pressure, all fuel passed through the fuel boost pump to reach the engine. The examination revealed that the fuel boost pump inlet shut-off valve arm was bent, and the bending was not consistent with impact forces. The fuel boost pump was then setup for a field test. Whenpower was applied to the pump, it pumped fuel from a bucket; however, it did not appear to pump the fuel at maximum capacity. The fuel boost pump was then forwarded to Bell Helicopter for further examination under the supervision of an FAA inspector. The pump was subsequently tested with both the bent arm installed and a replacement stock arm. The test results were similar for both arms, which were both below the pump's flow requirements. The bent inlet shut-off valve arm was re-installed and the fuel boost pump was then forwarded to the pump manufacturer's facility for a third examination under the supervision of an FAA inspector. That examination revealed that the pump was manufactured in 1983 and overhauled by a different company in 1989. The pump's ring tong terminals and pump cartridge were not the models that were originally installed in 1983. Rather, they were for a different model fuel boost pump; however, the pump passed flow tests as received. Additionally, flow improved when the inlet valve stem assembly and cartridge were replaced, respectively. The engine was removed from the helicopter and placed in a test-stand for a test-run under the supervision of an NTSB investigator. During the set-up, leaks were detected at both ends of the Pc line connecting the Pc filter to the power turbine governor T-fitting; however, the engine was started and generated 368 shaft horsepower. Although the engine did not attain the rated 420 shaft horsepower, no anomalies were detected during the test-run that explained the total loss of engine power. The annunciator panel and fuel pressure switch were examined at Bell Helicopter, under the supervision of an FAA inspector. The filaments of the "FUEL BOOST" caution bulbs of the annunciator panel were intact and did not exhibit any elongation. The fuel pressure switch passed a functional check, opening and closing within specifications. Review of U.S. Army Technical Bulletin TB 1-1520-248-20-60 revealed: "... During two accident investigations, the inlet shutoff valve arm of the cartridge type fuel pump was found bent. This condition may result in power loss or flameout due to restriction of fuel flow...WARNING...A bent inlet shutoff valve arm may prevent the shutoff valve from completely opening causing a restricted fuel flow..." The recorded weather at an airport 20 miles southeast of the accident site, at 1255, included calm winds and visibility 10 miles. ## Aircraft - Registration: [N132HD](https://openairdocs.org/aircraft/N132HD), registered now, S/N 72-21264, built 1972 (OpenAirDocs) - Reported make and model: BELL OH-58A - Registry model: [Bell OH-58A](https://openairdocs.org/model/bell-oh-58a) (registry code 1181579) (OpenAirDocs) - Registry engine: [Allison T63 series](https://openairdocs.org/engine/allison-t63-series) (registry code 03031, turbo-shaft) (OpenAirDocs) - Category: Helicopter - Serial number: 72-21264 - Airframe hours: 9030 - Engines: Rolls Royce T63-A-720 420 horsepower turbo shaft - Damage: Substantial damage - Flight: Aerial application, Part 137 - Operator: Cahaba Forestry Services - Registered owner: Cahaba Forestry Services - Airworthiness certificate: Special, Restricted (Special) - Last inspection: 100 hour, May 17, 2010, 120 hours before - Departed: NONE, Taylorsville, MS - Destination: NONE, Taylorsville, MS ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 46; injuries: serious; commercial, flight instructor, private; airplane ratings: single-engine land; medical: class 2, without waivers/limitations; last flight review May 30, 2009; seat: right; flight hours: 10,000 total, 800 in this make and model, 10,000 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: 4,600 ft broken - Temperature: 90 °F, dew point 66 °F - Altimeter: 30.15 inHg - Observed at: PIB, 20 nm away ## 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 20100924051199A](https://openairdocs.org/incident/20100924051199A), Sep 24, 2010: Bell OH-58A, Taylorsville, MS, Substantial damage. On 24 September 2010 at approximately 1315 CDT, 1815 UTC, N132HD crashed in a wooded area at the following coordinates: N31 54 52 W089 26 08 near Taylorsville,… ## Other investigations on N132HD (1) 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. - [NTSB ERA22LA341](https://openairdocs.org/ntsb/ERA22LA341), Jul 27, 2022: Garlick OH-58A+ (N132HD), Bloomsburg, PA, substantial damage. Probable cause: The pilot's inadequate preflight planning and visual lookout, which resulted in impact with a powerline. ## Docket (12 files) The files NTSB released with the investigation on May 2, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=77392. 10.0 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 360 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40345199&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Interview Summary (item 2, .PDF, 50 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40345189&FileExtension=.PDF&FileName=Interview%20Summary-Master.PDF - Bell Video of Fuel Boost Pump Test (2MB) (item 3, .PDF, 18 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40346175&FileExtension=.PDF&FileName=Bell%20Video%20of%20Fuel%20Boost%20Pump%20Test%20(2MB)-Master.PDF - Excerpt From Engine Manufacturer Report of Engine Test Run (item 4, .PDF, 89 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40345190&FileExtension=.PDF&FileName=Excerpt%20From%20Engine%20Manufacturer%20Report%20of%20Engine%20Test%20Run-Master.PDF - Helicopter Manufacturer Factual Notes of Fuel Boost Pump Examination (item 5, .PDF, 39 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40345193&FileExtension=.PDF&FileName=Helicopter%20Manufacturer%20Factual%20Notes%20of%20Fuel%20Boost%20Pump%20Examination-Master.PDF - Correspondence From Helicopter Manufacturer (item 6, .PDF, 330 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40346098&FileExtension=.PDF&FileName=Correspondence%20From%20Helicopter%20Manufacturer-Redacted.PDF - Excerpts From Pump Manufacturer Report of Fuel Boost Pump Teardown Examination and Tests (item 7, .PDF, 526 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40347011&FileExtension=.PDF&FileName=Excerpts%20From%20Pump%20Manufacturer%20Report%20of%20Fuel%20Boost%20Pump%20Teardown%20Examination%20and%20Tests-Redacted.PDF - U.S. Army Technical Bulletin TB 1-1520-248-20-60 (item 8, .PDF, 49 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40346191&FileExtension=.PDF&FileName=U.S.%20Army%20Technical%20Bulletin%20TB%201-1520-248-20-60-Redacted.PDF - Weather Report (item 9, .PDF, 24 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40345195&FileExtension=.PDF&FileName=Weather%20Report-Master.PDF - Evidence Control Forms (item 10, .PDF, 97 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40345196&FileExtension=.PDF&FileName=Evidence%20Control%20Forms-Redacted.PDF - Statement of Party Representatives to NTSB Investigation (item 11, .PDF, 6.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40345197&FileExtension=.PDF&FileName=Statement%20of%20Party%20Representatives%20to%20NTSB%20Investigation-Redacted.PDF - Accident Photographs (item 12, .PDF, 4 photos, 2.0 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40346173&FileExtension=.PDF&FileName=Accident%20Photographs-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.