# NTSB LAX06CA227: Hughes 369D, N611WA, Kihei, HI, July 7, 2006 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: July 7, 2006, 09:10 local (19:10 UTC) - Place: Kihei, HI - Coordinates: 20.767778, -156.392776 - Nearby events: https://openairdocs.org/map.md?lat=20.7678&lon=-156.3928&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 3 uninjured - Status: Completed, report October 31, 2006 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 64078 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX06CA227 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/64078/pdf - Page: https://openairdocs.org/ntsb/LAX06CA227 ## Probable cause the pilot's failure to maintain an adequate clearance from obstructions, which led to a main rotor blade strike. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight collision with object, hover - in ground effect - object - tree(s) - clearance - not maintained, pilot in command (cause) ## Analysis The helicopter's main rotor blades struck a tree while in a hover. The purpose of the flight was to conduct animal control. Once the animal had been identified and neutralized, the pilot was directed to remove the animal. He landed the helicopter near the animal, which was in a confined area with rolling terrain, thick low trees, high grass, and lava rock outcroppings. About 15 feet above the ground, the main rotor blades contacted a tree off to the right rear side of the helicopter. The pilot repositioned the helicopter about 100 feet to another landing site and landed normally. He reported the main rotor "blades strike" to the company and waited for the Director of Maintenance (DOM) to arrive and assess the damage to the main rotor blades. The DOM determined that the helicopter could be flown back to home base. After the helicopter returned to base, maintenance personnel removed and inspected the main rotor blades. All five of the main rotor blades sustained substantial structural damage. Maintenance personnel referenced the maintenance manual and determined that the dents/depressions in the main rotor blades were beyond serviceable limits and could not be repaired. ## Factual narrative On July 7, 2006, about 0910 Hawaiian standard time, all five main rotor blades of a Hughes 369D, N611WA, struck a tree during a hover, near Kihei, Hawaii. Windward Aviation, Inc., operated the helicopter under the provisions of 14 CFR Part 91 as an Aerial Capture Eradication and Tagging of Animals (ACETA) operation for the Tri-Isle Resource Conservation and Development Council (Tri-Isle). The helicopter sustained structural damage to the all five main rotor blades. The pilot and two passengers were not injured. Visual meteorological conditions prevailed for the local area ACETA flight, and a company visual flight rules flight plan had been filed. The flight departed Kahului Airport (OGG), Kahului, Hawaii, about 0810. In the pilot's written statement, he reported that the purpose of the flight was to conduct an aerial reconnaissance and eradication within prescribed boundaries of a preserve above Kihei. After an hour of flight, an animal was identified within the prescribed boundaries. The pilot stated that he was asked to land by personnel from Tri-Isle so his passenger could recover the animal and transport it to the ground crew at an alternate site. He reported that the landing zone consisted of rolling terrain with thick low trees, high grass, and lava rock outcroppings. During the landing phase of the flight, about 15 feet above ground level (agl), the main rotor blades contacted a tree located on the right rear side of the helicopter. After the impact, the pilot repositioned the helicopter to an alternate landing site about 100 feet from the original landing zone. He shut down the helicopter, notified the operator, and waited for maintenance personnel to arrive and assess the damage to the helicopter. The Director of Maintenance inspected the main rotor blades and determined that the helicopter could be flown back to OGG. According to the pilot the decision to land was done while he was in a hover, and had not been part of the pre-brief prior to departure. Windward Aviation, Inc., maintenance personnel removed the main rotor blades and inspected them. Maintenance personnel determined with the use of the helicopter's maintenance manual that the dents/depressions of all of the main rotor blades were beyond serviceable limits and could not be repaired. Maintenance personnel measured the depth of the dents/depressions: Blade E116 - 0.090 inch at station 130 Blade D315 - 0.040 inch at station 130 Blade D307 - 0.080 inch at station 140 Blade E117 - 0.200 inch at station 124 Blade D316 - 0.160 inch at station 124 ## Aircraft - Registration: N611WA (not matched to a registry record) - Reported make and model: Hughes 369D - Category: Helicopter - Serial number: 590517D - Engines: Allison 250-C20B turbo shaft - Damage: Substantial damage - Flight: Other work use, Part 91 - Registered owner: Windward Aviation, Inc. - Airworthiness certificate: Standard, Normal - Departed: OGGA, Kahului, HI - Destination: OGG - Flight plan: Company VFR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 43; injuries: none; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: helicopter, airplane; medical: class 2; flight hours: 13,500 total, 9,300 in this make and model ## Weather - Conditions: Visual (VMC), Day - Visibility: 10 statute miles - Lowest ceiling: 4,500 ft broken - Temperature: 72 °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). - [Accident 20060707013629A](https://openairdocs.org/incident/20060707013629A), Jul 7, 2006: Hughes 369D, Puu Kali, HI, Substantial damage. (-23) During goat eradication for the park service pilot attempted to land in confined area and had main rotor strike and all five blades of HU-360D were… 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.