# NTSB FTW99LA131: Bell 206B, N35WH, Brazoria 440l, April 30, 1999 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: April 30, 1999, 07:30 local (12:30 UTC) - Place: Brazoria 440l - Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious, 3 uninjured; on the ground: 1 serious - Status: Completed, report June 22, 2000 - Report: Approved by Office Director - NTSB case key (mKey): 51165 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW99LA131 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/51165/pdf - Page: https://openairdocs.org/ntsb/FTW99LA131 ## Probable cause The failure of the platform worker to maintain clearance with the turning tail rotor blades. A factor was the inadequate coordination between the pilot and the passengers pertaining to procedures for disembarking from the helicopter. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Propeller/rotor contact to person, standing - engine(s) operating - clearance - not maintained, ground personnel (cause) - crew/group coordination - inadequate (contributing factor) ## Analysis An offshore oil platform worker was seriously injured when he walked into a helicopter's turning tail rotor blades. According to the pilot, he landed the helicopter on the platform with the tail rotor over a stairwell in order to land into the wind and avoid a crane operating on the platform. The helicopter was still 'light on the skids,' and he began to reposition the helicopter so the tail rotor would not be over the stairwell. Simultaneously, the rear passenger began to exit the helicopter without receiving authorization. The pilot terminated the repositioning by lowering the collective and rolling the throttle to the idle position. A few seconds had elapsed when the pilot felt a 'nick in the pedals.' Subsequently, one of the passengers notified the pilot that someone had walked into the tail rotor blades. The helicopter was not damaged. According to the passengers, the pilot never indicated to them that he intended to reposition the helicopter. Both passengers exited the helicopter upon hearing the engine power 'spool down.' The front seat passenger was helping the other passenger unload cargo from the helicopter and observed the worker come up the steps into the turning blades. ## Factual narrative On April 30, 1999, at 0730 central daylight time, a Bell 206B helicopter, N35WH, landed at the Brazoria 440L offshore platform, in the Gulf of Mexico. A platform worker was seriously injured when he walked into the helicopter's turning tail rotor blades. The helicopter was registered to and operated by Horizon Helicopters, Inc., of Houston, Texas. The airline transport pilot and his two passengers were not injured. Visual meteorological conditions prevailed for the Title 14 Code of Federal Regulations Part 135 non-scheduled, on-demand air taxi flight, and a company VFR flight plan was filed. The flight originated from the operator's private heliport, located near Matagorda, Texas, at 0715. The pilot reported in the enclosed Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2) that before takeoff he briefed the passengers on the safety procedures in and around the helicopter, as well as over water operations. During the approach to Brazoria 440L, the pilot noticed a crane operating on the platform. He circled the platform until the crane operator indicated that he had visual contact with the helicopter and ceased crane operations. The pilot stated that he maneuvered the helicopter so it approached the platform into the wind and clear of the crane, which upon landing, placed the tail rotor over the stairwell. After the helicopter landed and while it was still "light on the skids," he began to reposition the helicopter so the tail rotor blades would not be over the stairwell. Simultaneously, the rear passenger began to exit the helicopter without receiving authorization by the pilot. The pilot immediately aborted the repositioning maneuver and "lowered the collective full down, disarmed the floats, and rolled the throttle back to idle." Consequently, the tail rotor remained extended over the stairwell. The pilot reported that a few seconds had elapsed when he felt a "nick in the pedals." Subsequently, one of the passengers notified the pilot that a platform worker had walked into the turning tail rotor blades. The platform worker received a 3-inch laceration to his head and suffered a fractured skull. During telephone interviews conducted by the NTSB investigator-in-charge, both passengers stated that the helicopter was parked and that the pilot never indicated to them that he was going to reposition the helicopter. According to the passengers, they heard the engine power "spool down" and exited the helicopter. The front seat passenger stated that he had gone to the rear cargo door to help the other passenger unload the helicopter when he saw the platform worker coming up the steps. He added that before he could do or say anything the worker walked into the turning tail rotor blades, which were positioned directly over the stairwell. The pilot reported that the following weather conditions existed at the time of the accident: clear skies, visibility greater than 10 miles, temperature 73 degrees Fahrenheit, and wind from the east at 30-35 knots. The helicopter was inspected by the pilot immediately following the incident and no damage was noted. Subsequently, the tail rotor was inspected by an FAA certified airframe and powerplant mechanic. The mechanic stated that no visible damage was observed to any part of the helicopter. ## Aircraft - Registration: N35WH (not matched to a registry record) - Reported make and model: Bell 206B - Category: Helicopter - Serial number: 2736 - Airframe hours: 11030 - Engines: Allison 250-C20B 420 horsepower turbo shaft - Damage: No damage - Flight: Part 135 - Airworthiness certificate: Standard, Normal - Departed: NONE, MATAGORDA, TX - Destination: NONE, GM - Flight plan: Company VFR - Airport: NONE, Ba-440l ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 30; flight instructor, airline transport; airplane ratings: single-engine land; instrument ratings: helicopter; medical: class 2, valid medical--no waivers/lim.; seat: right; flight hours: 3,300 total, 500 in this make and model, 3,100 as pilot in command, 150 in the last 90 days, 60 in the last 30 days, 2 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 90° at 30 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 73 °F ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Incident 19990430024429I](https://openairdocs.org/incident/19990430024429I), Apr 30, 1999: Bell 206B, Gulf Of Mexico. (-23) Ground personnel walked into turning anti-torque device. Pilot landed into wind causing positioning of tail-boom over stairway. Ground personnel… 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.