# NTSB DFW05LA017: Bell 206B, N496RL, S.Timbelier 187, November 5, 2004 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: November 5, 2004, 13:30 local (19:30 UTC) - Place: S.Timbelier 187 - Coordinates: 28.483333, -90.316665 - Nearby events: https://openairdocs.org/map.md?lat=28.4833&lon=-90.3167&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious, 1 minor, 1 uninjured - Status: Completed, report January 24, 2005 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 60503 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DFW05LA017 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/60503/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=60503 - Page: https://openairdocs.org/ntsb/DFW05LA017 ## Probable cause The loss of engine power for undetermined reasons. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, cruise - reason for occurrence undetermined (cause) - Forced landing, emergency descent/landing - autorotation - performed, pilot in command - Ditching, emergency landing - emergency floats - terrain condition - water,rough ## Analysis The helicopter departed an offshore platform located in open ocean water and climbed to 500 feet. Subsequently, the 10,961-hour pilot that at he heard a "loud bang" and then the engine lost power. The pilot initiated an autorotation and deployed the emergency skid-mounted float system. Approximately 50-60 feet above the rough ocean water, the pilot "started to flare and selected a wave to land on." The helicopter landed hard on the water, and remained upright for about 20 minutes before it rolled over inverted and partially submerged. The pilot and his two passengers evacuated the helicopter immediately after touchdown without deploying the emergency on-board life raft. Approximately 30 minutes after the accident, another helicopter arrived and dropped an emergency life raft into the water for the pilot and crew until further assistance could arrive. A brief examination of the helicopter by the pilot after evacuation revealed that the tailboom was separated from the fuselage. Recovery efforts were initiated on November 6, 2004. During the recovery process, the skids of the helicopter separated from the fuselage and the helicopter sank. Ocean depths were approximately 180 feet in the area of the accident and recovery efforts ceased. The helicopter was not recovered and the reason for the loss of power could not be determined. ## Factual narrative On November 5, 2004, approximately 1330 central standard time, a Bell 206B single-engine turbine powered helicopter, N496RL, registered to and operated by Rotorcraft Leasing Co. LLC., of Lafayette, Louisiana, sustained substantial damage during a forced autorotation landing into open ocean water near offshore platform South Timbelier (ST) 187, located in the Gulf of Mexico. The commercial pilot sustained serious injuries, one of his two passenger's sustained minor injuries, and one passenger was not injured. Visual meteorological conditions prevailed and a company flight plan was filed for the 14 Code of Federal Regulations Part 135 on-demand air taxi flight. The flight originated from ST 187 and was destined for ST 161. The operator reported that the helicopter departed from the platform and climbed to an altitude of 500 feet above ground level (agl). As the 10,961-hour pilot switched radio frequencies to make a courtesy call to the destination platform, he heard a "loud bang," and then the engine lost power. The pilot initiated an autorotation and deployed the emergency skid-mounted float system. Approximately 50-60 feet above the rough ocean water, the pilot "started to flare and selected a wave to land on." The helicopter landed hard on the water, and remained upright for approximately 20 minutes before it rolled over inverted and partially submerged. The helicopter remained floating inverted near the surface. The pilot and two passengers evacuated the helicopter immediately after touchdown without deploying the emergency on-board life raft. Approximately 30 minutes after the accident, another helicopter arrived and dropped an emergency life raft into the water for the pilot and crew until further assistance could arrive. A brief examination of the helicopter by the pilot after evacuation revealed that the tailboom was separated from the fuselage. Recovery efforts were initiated on November 6, 2004. During the recovery process, the skids of the helicopter separated from the fuselage and the helicopter sank. Ocean depths were approximately 180 feet in the area of the accident and recovery efforts ceased. The helicopter was not recovered. The operator also reported that the helicopter underwent it's most recent Approved Airworthiness Inspection Program (AAIP) inspection on October 7, 2004, at an airframe total time of 8,615.7 hours and an engine time of 1351.8 hours since major overhaul. At the time of the accident, the helicopter had accumulated 114 hours since its last inspection. The reason for the loss of engine power was undetermined. ## Aircraft - Registration: [N496RL](https://openairdocs.org/deregistered/N496RL-2012-04-16), registration cancelled 2012-04-16, S/N 3496, built 1981 (OpenAirDocs) - Reported make and model: Bell 206B - Registry model: [Bell 206B](https://openairdocs.org/model/bell-206b) (registry code 1181511) (OpenAirDocs) - Registry engine: [Allison 250 SER 250HP](https://openairdocs.org/engine/allison-250-ser-250hp) (registry code 03002, turbo-shaft) (OpenAirDocs) - Category: Helicopter - Serial number: 5943 - Airframe hours: 8615.7 - Engines: Rolls-Royce 250-C20B 420 horsepower turbo shaft - Damage: Destroyed - Flight: Part 135 - Registered owner: Rotorcraft Leasing Co LLC. - Airworthiness certificate: Standard, Normal - Last inspection: AAIP, October 7, 2004, 114 hours before - Departed: S.Timbelier 187, GM - Destination: S.Timbelier 161, GM - Flight plan: Company VFR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 64; injuries: serious; commercial; airplane ratings: single-engine land; instrument ratings: helicopter, airplane; medical: class 2, valid medical--w/ waivers/lim; last flight review August 24, 2004; seat: right; flight hours: 10,961 total, 8,774 in this make and model, 10,834 as pilot in command, 174 in the last 90 days, 70 in the last 30 days, 4 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 30° at 20 knots - Visibility: 5 statute miles - Lowest ceiling: none - Temperature: 79 °F, dew point 57 °F - Altimeter: 30.15 inHg ## 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 20041105031159A](https://openairdocs.org/incident/20041105031159A), Nov 5, 2004: Bell 206B, Gulf Of Mexico, US, Substantial damage. (-23) The personnal aboard the aircraft heard a loud explosion. The explosion, in accordance with the pilot in command was followed by a loss of power.… ## Docket (1 files) The files NTSB released with the investigation on November 29, 2004, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=60503. 1.8 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 1.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40448635&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-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.