# NTSB LAX04LA249: Bell 206B, N97AZ, Mesa, AZ, June 25, 2004 - Type: NTSB accident investigation - Classification: Accident · Fatal · Limited investigation · Final report - Date: June 24, 2004, 21:10 local (Jun 25, 2004, 04:10 UTC) - Place: Mesa, AZ - Coordinates: 33.460834, -111.728332 - Nearby events: https://openairdocs.org/map.md?lat=33.4608&lon=-111.7283&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Highest injury: Fatal - Injuries: 1 fatal - Status: Completed, report July 7, 2005 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 59504 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX04LA249 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/59504/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=59504 - Page: https://openairdocs.org/ntsb/LAX04LA249 ## Probable cause the pilot's failure to adequately clear the left skid of obstacles resulting in a dynamic rollover of the helicopter and collision with terrain. A factor in the accident was the dark nighttime lighting conditions. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Roll over, takeoff - light condition - night (contributing factor) - airport facilities,helipad - other - clearance - not maintained, pilot in command (cause) - landing gear,ski assembly - movement restricted - dynamic rollover - inadvertent, pilot in command (cause) ## Analysis The helicopter experienced a dynamic rollover and impacted terrain during an attempted takeoff from a parked trailer. A pilot acquaintance of the pilot described the trailer as a modified boat trailer, with an open and trough-shaped platform surrounded by "D" shaped tie down rings, which the acquaintance did not think was suitable for safe takeoff and landing operations. Earlier in the day, the pilot made several unsuccessful attempts to land the helicopter on the recently purchased trailer, and opted to land on the runway surface next to the trailer. After obtaining fuel, the pilot decided to make an additional attempt to land on the trailer in the dark night conditions. Witnesses saw the helicopter land on the trailer. Shortly after touchdown, the pilot attempted to depart the trailer platform and as the helicopter lifted off, the left skid caught on one of the numerous "D" shaped rings affixed to the platform surface of the trailer. The helicopter experienced a dynamic rollover and collided with the ground. ## Factual narrative "THIS CASE WAS MODIFIED JUNE 4, 2008." On June 24, 2004, about 2110 mountain standard time, a Bell 206B, N97AZ, experienced a dynamic rollover and impacted terrain during an attempted takeoff from a trailer parked at the Falcon Field Airport, Mesa, Arizona. The pilot was operating the helicopter under the provisions of 14 CFR Part 91. The certified flight instructor pilot, the sole occupant, was fatally injured and the helicopter was substantially damaged. Visual meteorological conditions prevailed, and a flight plan had not been filed. The personal local flight originated from Falcon Field Airport about 2105. In a written statement, a friend of the pilot reported that upon arriving at the airport, he observed the pilot land the helicopter adjacent to a trailer. After the helicopter was shutdown, he engaged in conversation with the pilot, who informed him that he was intending to practice landings on his recently purchased transport trailer that night. The pilot stated that his earlier attempts to land the helicopter on the trailer were unsuccessful, which he attributed to the helicopter's weight distribution. Specifically, he thought that the center of gravity was too far aft due to the low fuel level, which was making it difficult to maintain the appropriate hover configurations. The pilot added that he intended to obtain fuel, and make another attempt to land the helicopter on the trailer. During a telephone interview with a National Transportation Safety Board investigator, the friend of the pilot further added that the pilot had recently purchased the trailer, and was not experienced at maneuvering the helicopter onto it. He described the trailer as a modified boat trailer, with an open and trough-shaped platform, which he did not think was suitable for safe takeoff and landing operations. He opined that during the accident sequence the helicopter's left skid caught on one of the numerous "D" shaped rings affixed to the platform surface. He added that at the time of the accident sky conditions were dark. In a written statement, an air traffic control specialist reported that he observed the pilot make three or four unsuccessful attempts at landing the helicopter on the transport trailer about 45 minutes prior to the accident. In statements collected by the Mesa Police Department, witnesses reported observing the helicopter land on the trailer. As the helicopter began to liftoff the trailer surface, the left skid caught on the trailer, resulting in a dynamic rollover and collision with the ground. ## Aircraft - Registration: [N97AZ](https://openairdocs.org/deregistered/N97AZ-2011-04-27), registration cancelled 2011-04-27, S/N 2693 (OpenAirDocs) - Reported make and model: Bell 206B - Registry model: [Bell 206B](https://openairdocs.org/model/bell-206b) (registry code 1181511) (OpenAirDocs) - Category: Helicopter - Serial number: 2693 - Engines: Allison 250 C-20 270 horsepower turbo shaft - Damage: Substantial damage - Fire: On-Ground - Flight: Personal, Part 91 - Operator: Ned K. Buher - Registered owner: Arizona Helicopter Adventures LLC - Airworthiness certificate: Standard, Normal - Departed: FFZ, Mesa, AZ - Destination: FFZ - Airport: FFZ, Falcon Field Airport ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 41; injuries: fatal; commercial, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: right; toxicology performed; flight hours: 2,300 total ## Weather - Conditions: Visual (VMC), Night/dark - Wind: 50° at 8 knots - Visibility: 40 statute miles - Lowest ceiling: none - Temperature: 97 °F, dew point 39 °F - Altimeter: 29.85 inHg - Observed at: FFZ ## 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 20040624015099A](https://openairdocs.org/incident/20040624015099A), Jun 24, 2004: Bell 206B, Mesa, AZ, Substantial damage, 1 fatal. (-23) On June 24, 2004, about 2110 mountain standard time, a Bell 206B, N97AZ, rolled over and collided with the ground while hovering onto a trailer at Mesa,… ## Docket (4 files) The files NTSB released with the investigation on April 25, 2005, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=59504. 349 KB in all. - Witness Statements (item 1, .PDF, 111 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413147&FileExtension=.PDF&FileName=Witness%20Statements-Redacted.PDF - Air Traffic Control Personnel Statements (item 2, .PDF, 87 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413148&FileExtension=.PDF&FileName=Air%20Traffic%20Control%20Personnel%20Statements-Redacted.PDF - Toxicological Report (item 3, .PDF, 60 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40216030&FileExtension=.PDF&FileName=Toxicological%20Report-Master.PDF - Statement and Record of Conversation with Friend of Pilot (item 4, .PDF, 91 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413149&FileExtension=.PDF&FileName=Statement%20and%20Record%20of%20Conversation%20with%20Friend%20of%20Pilot-Redacted.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.