# NTSB FTW03FA097: Bell 407, N407HH, Mi 700, February 16, 2003 - Type: NTSB accident investigation - Classification: Accident · Fatal · Field investigation · Final report - Date: February 16, 2003, 12:25 local (18:25 UTC) - Place: Mi 700 - Coordinates: 27.853055, -96.694725 - Nearby events: https://openairdocs.org/map.md?lat=27.8531&lon=-96.6947&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Fatal - Injuries: 2 fatal, 3 serious - Status: Completed, report April 28, 2005 - Report: Approved by Office Director - Parties: Houston Helicopters, Bell Helicopter, FAA, Rolls Royce - NTSB case key (mKey): 56497 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW03FA097 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/56497/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=56497 - Page: https://openairdocs.org/ntsb/FTW03FA097 ## Probable cause The catastrophic failure of the engine resulting from 1st stage turbine wheel blade failure due to type 1 hot corrosion (sulfidation). Contributing factors were the pilot's failure to brief the passengers on emergency safety equipment (life raft), the pilot's failure to deploy the skid-mounted emergency float system during the autorotation, the high wind conditions, and rough sea state. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(total) - mech failure/malf, cruise - turboshaft engine,free(power) turbine - failure,total (cause) - turbine assembly,turbine blade - failure,total (cause) - turbine assembly,turbine wheel - corroded (cause) - passenger briefing - not performed, pilot in command (contributing factor) - Forced landing, descent - emergency - autorotation - performed, pilot in command - Ditching, emergency landing - Roll over, standing - emergency floats - not deployed, pilot in command (contributing factor) - emergency equipment - not deployed (contributing factor) - terrain condition - water,rough (contributing factor) - weather condition - high wind (contributing factor) ## Analysis The helicopter, flown by 19,000-hour pilot and transporting 4 passengers to an offshore oil platform, experienced a catastrophic engine failure and autorotated into open ocean water in the Gulf Of Mexico. Within a few seconds after landing on the water, the helicopter rolled inverted, the pilot and passengers exited, inflated their personal life vests, and waited for rescue. The pilot and one of the passengers drowned prior to rescue personnel arriving about 2 hours after the accident. Surviving passenger statements indicated that they were not aware of an emergency lift raft on-board the helicopter, and that the skid-mounted emergency float system was not inflated prior to landing. Rescue personnel reported high wind and rough seas in the area of the accident. Examination of the wreckage revealed that the float "ARM" switch was found in the disarmed position and its cover closed. The skid-mounted emergency floats were found inside their protective bags. The float system tested functional, and no anomalies were found during airframe component examinations. Download data from the ECU showed that engine performance prior to the loss of power was normal and the engine was operating in a steady state condition prior to the initial deterioration of NG. Detailed inspection of the engine revealed progressive turbine wheel damage throughout the power turbine. The damage varied from approximately 95% of the airfoil material missing on the 1st stage wheel to approximately 10% of the material missing on the 4th stage wheel. The damage observed in the gas producer turbine section was consistent with the separation of one or more of the first stage wheel airfoils. Mostly all of the fracture surfaces were obscured, typical of elevated turbine temperatures (according to the manufacturer, in excess of turbine and material limits). All 4 turbine wheels had evidence of solutioning and incipient melting was observed at the tips of the airfoil remnants. Fracture surfaces of the 1st stage wheel airfoils did not reveal the presence of fatigue. Detailed metallurgical examination revealed the presence of sulfides on the 1st and 2nd stage turbine wheel surfaces. According to the manufacturer, the presence of sulfides is evidence that sulfidation has occurred. Damage on the concave surface adjacent to the fractures near the leading edges of the airfoils was found consistent with type 1 hot corrosion (sulfidation) damage. Examination of radial cracks at the trailing edges of the airfoils revealed heavy oxidation consistent with thermal fatigue. According to Rolls Royce, that "thermal fatigue cracking at the airfoil base is not uncommon." Evidence of EPS 10649 (S1 Aluminide, which is a protective coating applied to the turbine wheel during manufacturing), was confirmed adjacent to the corrosive damage found on the wheels. ## Factual narrative HISTORY OF FLIGHT On February 16, 2003, approximately 1225 central standard time, a Bell 407 single-engine helicopter, N407HH, registered to and operated by Houston Helicopters, Inc., of Pearland, Texas, executed an emergency landing into open ocean water in the Gulf of Mexico following a loss of engine power. The pilot and his four passengers survived the initial landing, however, the pilot and one passenger later drowned after egress from the helicopter. The remaining three passengers received serious injuries. Visual meteorological conditions prevailed, and a company visual flight rules (VFR) flight plan was filed for the Title 14 Code of federal Regulations Part 135 on-demand air taxi flight. Approximately 1210, the helicopter departed Harbor Island (TeSoro Heliport), Ingleside, Texas, for a 26.1 nautical mile flight to offshore platform, Ensco Rig 84 (Matagorda 700 block offshore), with an estimated time of arrival of 1230. According to recorded communication records provided by the operator, the pilot of N407HH had transmitted a "Mayday" call, approximately 1225, citing an engine failure, and that he was going to land the helicopter on the water. Sounds similar to an "engine-out" audio tone were heard in the background of the Mayday call. Upon reception of the Mayday call, the Coast Guard stationed at Aransas Pass, Texas, and Corpus Christi, Texas, were notified, and an immediate search and rescue was initiated by the operator, the Coast Guard, private water vessels, and other helicopter operators. Two of the surviving passengers reported that they heard a loud "bang" at the time of the loss of engine power. The survivors also reported that the helicopter rolled inverted within a few seconds after the landing and began to submerge. They stated that the skid-mounted emergency float system were not inflated at the time of the landing. The pilot and passengers exited the helicopter, inflated their life vests, and awaited their rescue. Approximately 1425, the pilot and passengers were recovered by the Coast Guard. (See 'Survival Aspects' section for additional details). The operator, Coast Guard helicopter pilots, pilot's of other search helicopters, and two of the passengers reported the winds were from the north at 25-40 mph with 5-9 foot sea swells. PERSONNEL INFORMATION The 19,000-hour pilot-in-command, held a valid commercial pilot certificate, issued on May 25, 1964, with a rotorcraft-helicopter rating. The pilot also held a valid mechanic certificate, issued December 8, 1965, with airframe and power plant ratings. His most recent second class medical certificate was issued on June 12, 2002, with the limitation that he must have available glasses for near vision. On the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2) the operator reported the pilot's total flight time in all aircraft was 19,339 hours, of which, 19,299 hours were in rotorcraft. The pilot's total accumulated flight time in the Bell 407 was151 hours. A review of company flight and duty records revealed the pilot flew 168.9 hours, 263.9 hours (27.9 Bell 407), and 232.8 hours (89.9 Bell 407) in years 2000, 2001, and 2002, respectively. His most recent flight experience was 57 hours, 21 hours, and 3.5 hours in the past 90 days, 30 days, and 24 hours, respectively. The pilot was off duty from February 6-10, 2003. Flight and duty records for February 11-16 were not recovered from the helicopter and are presumed destroyed. According to the aircraft's (N407HH) maintenance log for February 11-14, 2003, the pilot flew 1.2 hours on February 11, 1.2 hours on February 12, and 2.5 hours on February 14. A review of company records revealed that the pilot satisfactory completed company training and the airman competency/proficiency testing requirements (FAA CFR Part 135.293 (a) (b) Part 299) to act as pilot-in-command (PIC) of Bell 407 helicopters on May 8, 2001. The pilot's most recent recurrent ground training records, dated March 20, 2002, certified the pilot-in-command had received ground training on life rafts, survival vests, ditching procedures, and water survival techniques. Underwater egress training for the pilot could not be verified. The pilot's most recent competency/proficiency check, conducted by the company check airman, for the Bell 407 helicopter was satisfactorily performed on May 31, 2002. AIRCRAFT INFORMATION The Bell 407 helicopter, serial number (SIN) 53460, helicopter was manufactured in 2000, and issued an airworthiness certificate on December 9, 2000, and was registered to Houston Helicopters, Inc., on February 1, 2001. Total airframe time at the time of the accident was approximately 612.7 hours since manufactured. The helicopter was equipped with a Full Authority Digital Electronic Control system (FADEC) and Electronic Control Unit (ECU) with version 7102 software, which includes incident recording capability. On December 12, 2002, the last annual inspection of N407HH, which was accomplished at a total time of 546.8 hours by the Houston Helicopter, Inc., FAA certificated repair station, encompassed the 50 hour, 100 hour and 300 hour airframe inspection and the 150 hour engine inspection. During the inspection, the electrical system functional test, inflation test, and float pneumatic system checks and bottle servicing were satisfactorily performed for the emergency float system. The helicopter was not equipped with a cockpit voice recorder (CVR) or a digital flight data recorder (DFDR). The helicopter's power plant, installed new on October 28, 2000, was an 650-horsepower Allison/Rolls Royce 250-C47B turbo shaft engine, part number (PIN) 23063392, SIN CAE 847499. The last annual inspection engine inspection coincided with the last airframe inspection on December 12, 2002, at a total time of 546.8 hours. The turbine engine maintenance inspection was performed in accordance with the Rolls Royce/Allison Operations and Maintenance Manual. Total engine time at the time of the accident was 612.7 hours ( power cycles:1,679, start cycles:1,116). In May 2001, the operator found (during an inspection) that the internal engine oil filter was not installed. The time on the engine was 97.0 hours. On September 7, 2001, two bearings (258.6 hours) PIN 407-340-339-103, SIN C00-2514 and D00-0027 were removed and replaced. The starter generator (164.7 hours) was removed and replaced on July 3, 2002. Maintenance records for January 4, 2003, stated the "floats circuit breaker pops when float switch armed/repaired wire." Time on the aircraft was 562.4 hours. The last refueling of N407HH prior to the accident occurred on February 14, 2003, with a total of 90.2 gallons. WRECKAGE AND IMPACT INFORMATION Recovery On February 26, 2003, search for the submerged helicopter was initiated by the insurance company. Side scan sonar located the helicopter on February 27, 2003, at North 27 degrees 51 minutes 23.617 seconds; West 096 degrees 41 minutes 36.493 seconds (approximately 1,400 feet northeast of the last known position). According to divers, the helicopter was found inverted at a depth of 96 feet with 2 of the 4 main rotor blades embedded in sand and silt. The helicopter was raised on March 16, 2003. According to an FAA inspector, who was aboard the recovery vessel, the boat stabilizing pylon was inadvertently jacked down onto the wreckage, resulting crushing damage to the airframe and cabin. After the wreckage was raised, it was rinsed with fresh water on board the recovery vessel. The ECU and three instrument panel-mounted engine instruments (MGT, Torque, and Ng) were removed and placed in fresh water for preservation. The helicopter was brought to shore and transported via ground vehicle by Air Salvage of Dallas (ASOD), Lancaster, Texas, to the ASOD facility where is was secured for further examination by the Board. Initial Wreckage Examination Under the supervision of the NTSB IIC, the ## Aircraft - Registration: [N407HH](https://openairdocs.org/deregistered/N407HH-2004-03-04), registration cancelled 2004-03-04, S/N 53460, built 2000 (OpenAirDocs) - Reported make and model: Bell 407 - Registry model: [Bell 407](https://openairdocs.org/model/bell-407) (registry code 1182206) (OpenAirDocs) - Registry engine: [Allison 250-C47 series](https://openairdocs.org/engine/allison-250-c47-series) (registry code 03029, turbo-shaft) (OpenAirDocs) - Category: Helicopter - Serial number: 53460 - Airframe hours: 546.8 - Engines: Allison 250-C47B 600 horsepower turbo shaft - Damage: Destroyed - Flight: Part 135 - Registered owner: Houston Helicopters, Inc. - Airworthiness certificate: Standard, Normal - Last inspection: AAIP, December 10, 2002, 62.2 hours before - Departed: Ingleside, TX - Destination: MI 700, GM - Flight plan: Company VFR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 65; injuries: fatal; commercial, flight instructor; medical: class 2, valid medical--w/ waivers/lim; last flight review May 31, 2004; seat: right; toxicology performed; flight hours: 19,339 total, 151 in this make and model, 57 in the last 90 days, 21 in the last 30 days ## Weather - Conditions: Visual (VMC) - Wind: 360° at 20 knots, gusting 30 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 50 °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 20030216001569A](https://openairdocs.org/incident/20030216001569A), Feb 16, 2003: Bell 407, Gulf Of Mexico, US, Destroyed, 2 fatal. (.19) On February 16, 2003, approximately 1225 central standard time, a Bell 407 single-engine helicopter, landed offshore in the Gulf Of Mexico following a… ## Docket (69 files) The files NTSB released with the investigation on January 20, 2005, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=56497. 62.4 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 247 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224228&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Materials Laboratory 15 - Factual Report 03-038 Rolls 250 engine (item 2, .PDF, 8.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40199773&FileExtension=.PDF&FileName=Materials%20Laboratory%2015%20-%20Factual%20Report%2003-038%20Rolls%20250%20engine-Master.PDF - Witness/Passenger Statements (item 3, .PDF, 667 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40385812&FileExtension=.PDF&FileName=Witness%2FPassenger%20Statements-Redacted.PDF - Maps or Charts of Accident Area, Wreckage Diagrams (item 4, .PDF, 1.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224234&FileExtension=.PDF&FileName=Maps%20or%20Charts%20of%20Accident%20Area,%20Wreckage%20Diagrams-Master.PDF - US Coast Guard Search & Rescue Report (item 5, .PDF, 1.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224229&FileExtension=.PDF&FileName=US%20Coast%20Guard%20Search%20%26%20Rescue%20Report-Master.PDF - Reports from Parties to the Investigation (Bell) (item 6, .PDF, 443 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224296&FileExtension=.PDF&FileName=Reports%20from%20Parties%20to%20the%20Investigation%20(Bell)-Master.PDF - Reports from Parties to the Investigation (NGPS-S) (item 7, .PDF, 3.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224300&FileExtension=.PDF&FileName=Reports%20from%20Parties%20to%20the%20Investigation%20(NGPS-S)-Master.PDF - Reports from Parties to the Investigation (Unison) (item 8, .PDF, 564 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224315&FileExtension=.PDF&FileName=Reports%20from%20Parties%20to%20the%20Investigation%20(Unison)-Master.PDF - Reports from Parties to the Investigation (Goodrich) (item 9, .PDF, 1.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224317&FileExtension=.PDF&FileName=Reports%20from%20Parties%20to%20the%20Investigation%20(Goodrich)-Master.PDF - Reports from Parties to the Investigation (Rolls Royce) (item 10, .PDF, 304 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224348&FileExtension=.PDF&FileName=Reports%20from%20Parties%20to%20the%20Investigation%20(Rolls%20Royce)-Master.PDF - Reports from Parties to the Investigation (Rolls Royce Metallurgy) (item 11, .PDF, 13.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224355&FileExtension=.PDF&FileName=Reports%20from%20Parties%20to%20the%20Investigation%20(Rolls%20Royce%20Metallurgy)-Master.PDF - Annual Inspection (item 12, .PDF, 1.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224235&FileExtension=.PDF&FileName=Annual%20Inspection-Master.PDF - Incident Recorder Plot Summary (ECU) (item 13, .PDF, 40 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224349&FileExtension=.PDF&FileName=Incident%20Recorder%20Plot%20Summary%20(ECU)-Master.PDF - Daily Maintenance Logs (item 14, .PDF, 2.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224237&FileExtension=.PDF&FileName=Daily%20Maintenance%20Logs-Master.PDF - Weight & Balance Data (item 15, .PDF, 37 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224238&FileExtension=.PDF&FileName=Weight%20%26%20Balance%20Data-Master.PDF - Aircraft Status Report (item 16, .PDF, 195 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224239&FileExtension=.PDF&FileName=Aircraft%20Status%20Report-Master.PDF - Piolt Records (item 17, .PDF, 603 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40385813&FileExtension=.PDF&FileName=Piolt%20Records-Redacted.PDF - Predelivery Inspection (item 18, .PDF, 928 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224241&FileExtension=.PDF&FileName=Predelivery%20Inspection-Master.PDF - Engine Records (item 19, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224242&FileExtension=.PDF&FileName=Engine%20Records-Master.PDF - Statement of Parties (item 20, .PDF, 269 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224243&FileExtension=.PDF&FileName=Statement%20of%20Parties-Master.PDF - Release of Aircraft Wreckage, NTSB Form 6120.15 (item 21, .PDF, 116 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40385815&FileExtension=.PDF&FileName=Release%20of%20Aircraft%20Wreckage,%20NTSB%20Form%206120.15-Redacted.PDF - Toxocology (item 22, .PDF, 154 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224268&FileExtension=.PDF&FileName=Toxocology-Master.PDF - Dispatcher Daily Log (item 23, .PDF, 196 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224270&FileExtension=.PDF&FileName=Dispatcher%20Daily%20Log-Master.PDF - General Operations Manual (item 24, .PDF, 660 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224284&FileExtension=.PDF&FileName=General%20Operations%20Manual-Master.PDF - Company Radio Log (item 25, .PDF, 1.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224316&FileExtension=.PDF&FileName=Company%20Radio%20Log-Master.PDF - Recorder Data (item 26, .PDF, 424 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224288&FileExtension=.PDF&FileName=Recorder%20Data-Master.PDF - Laboratory Results (item 27, .PDF, 51 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224290&FileExtension=.PDF&FileName=Laboratory%20Results-Master.PDF - Photo 01 Gas producer section (item 28, .PDF, 543 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224292&FileExtension=.PDF&FileName=Photo%2001%20Gas%20producer%20section-Master.PDF - Photo 02 Turbine 3rd stage wheel Courtesy Bell (item 29, .PDF, 174 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224314&FileExtension=.PDF&FileName=Photo%2002%20Turbine%203rd%20stage%20wheel%20Courtesy%20Bell-Master.PDF - Photo 03 Turbine 4th stage wheel-rotor assmebly (item 30, .PDF, 504 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224313&FileExtension=.PDF&FileName=Photo%2003%20Turbine%204th%20stage%20wheel-rotor%20assmebly-Master.PDF - Photo 04 Turbine 2nd stage nozzle and ring (item 31, .PDF, 620 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224328&FileExtension=.PDF&FileName=Photo%2004%20Turbine%202nd%20stage%20nozzle%20and%20ring-Master.PDF - Photo 05 Turbine 1st stage wheel (item 32, .PDF, 613 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224330&FileExtension=.PDF&FileName=Photo%2005%20Turbine%201st%20stage%20wheel-Master.PDF - Photo 06 Turbine 1st stage nozzle (item 33, .PDF, 673 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224337&FileExtension=.PDF&FileName=Photo%2006%20Turbine%201st%20stage%20nozzle-Master.PDF - Photo 07 Impeller (item 34, .PDF, 608 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224340&FileExtension=.PDF&FileName=Photo%2007%20Impeller-Master.PDF - Photo 08 Turbine 2nd stage wheel (item 35, .PDF, 646 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224342&FileExtension=.PDF&FileName=Photo%2008%20Turbine%202nd%20stage%20wheel-Master.PDF - Photo 09 Turbine 3rd stage nozzle (item 36, .PDF, 532 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224351&FileExtension=.PDF&FileName=Photo%2009%20Turbine%203rd%20stage%20nozzle-Master.PDF - Photo 10 Turbine 4th stage wheel-rotor assembly (item 37, .PDF, 503 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224352&FileExtension=.PDF&FileName=Photo%2010%20Turbine%204th%20stage%20wheel-rotor%20assembly-Master.PDF - Photo 11 Fueling Facility (item 38, .PDF, 109 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224353&FileExtension=.PDF&FileName=Photo%2011%20Fueling%20Facility-Master.PDF - Photo 12 Fueling facility filter (item 39, .PDF, 128 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224354&FileExtension=.PDF&FileName=Photo%2012%20Fueling%20facility%20filter-Master.PDF - Photo 13 Wiring harness (item 40, .PDF, 591 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224356&FileExtension=.PDF&FileName=Photo%2013%20Wiring%20harness-Master.PDF - Photo 14 Tail rotor assembly (item 41, .PDF, 632 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224357&FileExtension=.PDF&FileName=Photo%2014%20Tail%20rotor%20assembly-Master.PDF - Photo 15 Main rotor blades (item 42, .PDF, 762 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224358&FileExtension=.PDF&FileName=Photo%2015%20Main%20rotor%20blades-Master.PDF - Photo 16 Emergency flotation cylinder (item 43, .PDF, 464 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224359&FileExtension=.PDF&FileName=Photo%2016%20Emergency%20flotation%20cylinder-Master.PDF - Photo 17 View of helicopter (item 44, .PDF, 685 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224360&FileExtension=.PDF&FileName=Photo%2017%20View%20of%20helicopter-Master.PDF - Photo 18 View of helicopter (item 45, .PDF, 668 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224361&FileExtension=.PDF&FileName=Photo%2018%20View%20of%20helicopter-Master.PDF - Photo 19 View of helicopter (item 46, .PDF, 835 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224362&FileExtension=.PDF&FileName=Photo%2019%20View%20of%20helicopter-Master.PDF - Photo 20 View of helicopter (item 47, .PDF, 631 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224363&FileExtension=.PDF&FileName=Photo%2020%20View%20of%20helicopter-Master.PDF - Photo 21 View of helicopter (item 48, .PDF, 585 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224366&FileExtension=.PDF&FileName=Photo%2021%20View%20of%20helicopter-Master.PDF - Photo 22 View of collective (item 49, .PDF, 576 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224364&FileExtension=.PDF&FileName=Photo%2022%20View%20of%20collective-Master.PDF - Photo 23 View of cockpit (item 50, .PDF, 585 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224385&FileExtension=.PDF&FileName=Photo%2023%20View%20of%20cockpit-Master.PDF - Photo 24 View of exemplary helicopter (item 51, .PDF, 686 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224367&FileExtension=.PDF&FileName=Photo%2024%20View%20of%20exemplary%20helicopter-Master.PDF - Photo 25 View of floats (item 52, .PDF, 628 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224368&FileExtension=.PDF&FileName=Photo%2025%20View%20of%20floats-Master.PDF - Photo 26 View of Ng, MGT, TRQ instruments (item 53, .PDF, 488 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224369&FileExtension=.PDF&FileName=Photo%2026%20View%20of%20Ng,%20MGT,%20TRQ%20instruments-Master.PDF - Photo 27 View of exhaust (item 54, .PDF, 500 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224370&FileExtension=.PDF&FileName=Photo%2027%20View%20of%20exhaust-Master.PDF - Photo 28 View of exhaust (item 55, .PDF, 496 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224371&FileExtension=.PDF&FileName=Photo%2028%20View%20of%20exhaust-Master.PDF - Photo 29 Wiring harness Courtesy Bell (item 56, .PDF, 129 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224372&FileExtension=.PDF&FileName=Photo%2029%20Wiring%20harness%20Courtesy%20Bell-Master.PDF - Photo 30 Inlet screen Courtesy Bell (item 57, .PDF, 189 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224373&FileExtension=.PDF&FileName=Photo%2030%20Inlet%20screen%20Courtesy%20Bell-Master.PDF - Photo 31 Map of accident site Courtesy Bell (item 58, .PDF, 168 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224374&FileExtension=.PDF&FileName=Photo%2031%20Map%20of%20accident%20site%20Courtesy%20Bell-Master.PDF - Photo 32 View of engine Courtesy Bell (item 59, .PDF, 202 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224375&FileExtension=.PDF&FileName=Photo%2032%20View%20of%20engine%20Courtesy%20Bell-Master.PDF - Photo 33 Main rotor blades Courtesy Bell (item 60, .PDF, 114 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224376&FileExtension=.PDF&FileName=Photo%2033%20Main%20rotor%20blades%20Courtesy%20Bell-Master.PDF - Photo 34 Tail rotor gear box Courtesy Bell (item 61, .PDF, 133 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224377&FileExtension=.PDF&FileName=Photo%2034%20Tail%20rotor%20gear%20box%20Courtesy%20Bell-Master.PDF - Photo 35 Exhaust Courtesy Houston Helicopters (item 62, .PDF, 313 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224379&FileExtension=.PDF&FileName=Photo%2035%20Exhaust%20Courtesy%20Houston%20Helicopters-Master.PDF - Photo 36 Tail rotor drive shaft Courtesy Houston Helicopters (item 63, .PDF, 313 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224389&FileExtension=.PDF&FileName=Photo%2036%20Tail%20rotor%20drive%20shaft%20Courtesy%20Houston%20Helicopters-Master.PDF - Photo 37 Emergency flotation system pressure gauge Courtesy Houston Helicopters (item 64, .PDF, 253 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224380&FileExtension=.PDF&FileName=Photo%2037%20Emergency%20flotation%20system%20pressure%20gauge%20Courtesy%20Houston%20Helicopters-Master.PDF - Photo 38 !st stage wheel & nozzle Courtesy Houston Helicopters (item 65, .PDF, 246 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224390&FileExtension=.PDF&FileName=Photo%2038%20!st%20stage%20wheel%20%26%20nozzle%20Courtesy%20Houston%20Helicopters-Master.PDF - Photo 39 2nd stage wheel & nozzle Courtesy Houston helicopters (item 66, .PDF, 269 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224381&FileExtension=.PDF&FileName=Photo%2039%202nd%20stage%20wheel%20%26%20nozzle%20Courtesy%20Houston%20helicopters-Master.PDF - Photo 40 3rd stage wheel & nozzle Courtesy Houston Helicopters (item 67, .PDF, 270 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224382&FileExtension=.PDF&FileName=Photo%2040%203rd%20stage%20wheel%20%26%20nozzle%20Courtesy%20Houston%20Helicopters-Master.PDF - Photo 41 4th stage wheel & nozzle Courtesy Houston Helicopters (item 68, .PDF, 290 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224383&FileExtension=.PDF&FileName=Photo%2041%204th%20stage%20wheel%20%26%20nozzle%20Courtesy%20Houston%20Helicopters-Master.PDF - Photo 42 Fuel nozzle Courtesy Houston Helciopters (item 69, .PDF, 283 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40224386&FileExtension=.PDF&FileName=Photo%2042%20Fuel%20nozzle%20Courtesy%20Houston%20Helciopters-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.