# NTSB DEN00LA165: Gulfstream G-IV, N1625, Sheridan, WY, September 6, 2000 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: September 6, 2000, 14:40 local (20:40 UTC) - Place: Sheridan, WY - Coordinates: 44.789569, -106.949127 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=44.7896&lon=-106.9491&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious, 11 uninjured - Status: Completed, report September 19, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 50216 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN00LA165 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/50216/pdf - Page: https://openairdocs.org/ntsb/DEN00LA165 ## Probable cause the pilot's inadvertent flight into unforecasted turbulent weather conditions. A contributing factor was the turbulence. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight encounter with weather, descent - weather condition - turbulence in clouds (contributing factor) - flight into adverse weather - inadvertent, pilot in command (cause) ## Analysis The pre-departure weather briefing received by the pilot called for occasional moderate turbulence below Flight Level 180. The captain stated that while descending at Flight Level 260, the airplane encountered unforecasted turbulence. One passenger was thrown "about the cabin" and sustained a broken ankle while returning to his seat after securing the galley at the pilot's request. ## Factual narrative On September 6, 2000, at approximately 1440 mountain daylight time, a Gulfstream Aerospace G-IV, N1625, was not damaged when it encountered turbulence during descent for landing at Sheridan, Wyoming. The airline transport certificated captain, copilot, and nine passengers were not injured; however, one passenger was seriously injured. The airplane was owned and operated by Texaco Inc., of White Plains, New York, under Title 14 CFR Part 91. Instrument meteorological conditions prevailed at the time of the accident. The cross-country business flight originated from White Plains, New York, approximately 3 hours 40 minutes before the accident. The pilot had filed an IFR flight plan with Sheridan, Wyoming, as the destination. The pilot received a pre-departure weather briefing for his intended route of flight which reported moderate turbulence below Flight Level (FL) 180 due to southwesterly winds. Based on the weather information available, moderate turbulence was not to be expected above FL 180. The captain stated that while descending into Sheridan, through FL 260, the airplane entered a cloud layer. He advised the passengers of possible turbulence and requested they "secure all loose items, tray tables, and to strap up." A passenger secured the galley area, and was returning to his seat when the aircraft experienced a sudden jolt, causing him to be thrown "about the cabin," resulting in a broken ankle. The aircraft continued to experience moderate turbulence while descending through FL 220. ## Aircraft - Registration: [N1625](https://openairdocs.org/aircraft/N1625), registered now, S/N 1358, built 1998 (OpenAirDocs) - Reported make and model: Gulfstream G-IV - Registry model: [Gulfstream Aerospace G-IV](https://openairdocs.org/model/gulfstream-aerospace-g-iv) (registry code 3980115) (OpenAirDocs) - Registry engine: [Rolls-Royce TAY-611SER](https://openairdocs.org/engine/rolls-royce-tay-611ser) (registry code 54561, turbo-fan) (OpenAirDocs) - Category: Airplane - Serial number: 1358 - Airframe hours: 390 - Engines: Rolls-Royce TAY MK611-8 13850 lbs thrust turbo fan - Damage: No damage - Flight: Personal, Part 91 - Registered owner: Texaco Inc. - Airworthiness certificate: Standard, Transport - Last inspection: 100 hour, September 1, 2000, 36 hours before - Departed: HPN, WHITE PLAINS, NY - Destination: SHR - Flight plan: IFR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; airline transport; airplane ratings: multi-engine sea, single-engine sea, multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 8,662 total, 517 in this make and model, 6,481 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Wind: 290° at 15 knots - Visibility: 10 statute miles - Lowest ceiling: 6,000 ft overcast - Temperature: 129 °F, dew point 115 °F - Altimeter: 30.00 inHg - Observed at: SHR ## 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 20000906013689A](https://openairdocs.org/incident/20000906013689A), Sep 6, 2000: Gulstm GIV, Sheridan, WY, No damage. (-23) Descending out of FL260, hit turbulance, the flight attendant/mechanic suffered a broken ankle. 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.