# NTSB CEN15MA290: Airbus Helicopters AS350B3E, N390LG, Frisco, CO, July 3, 2015

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Class 1 · Major · Final report
- Date: July 3, 2015, 13:39 local (19:39 UTC)
- Place: Frisco, CO
- Coordinates: 39.568611, -106.079444 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.5686&lon=-106.0794&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Defining event: [Takeoff: Loss of control in flight](https://openairdocs.org/ntsb-events/240)
- Highest injury: Fatal
- Injuries: 1 fatal, 2 serious
- Status: Completed, report May 9, 2017
- Report: Board-adopted at Board Meeting
- Investigation class: Class 1
- NTSB office: Central Region
- Parties: Turbomeca, Air Methods Corporation, BEA, OPEIU - Local 109, Airbus, FAA Denver FSDO, FAA AVP-100
- Safety recommendations: Yes
- NTSB case key (mKey): 91489
- NTSB case page: https://www.ntsb.gov/investigations/Pages/CEN15MA290.aspx
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/91489/pdf
- Board report AAR1701 (PDF): https://www.ntsb.gov/investigations/AccidentReports/Reports/AAR1701.pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=91489
- Page: https://openairdocs.org/ntsb/CEN15MA290

## Probable cause

Airbus Helicopters' dual-hydraulic AS350 B3e helicopter's (1) preflight hydraulic check, which depleted hydraulic pressure in the tail rotor hydraulic circuit, and (2) lack of salient alerting to the pilot that hydraulic pressure was not restored before takeoff. Such alerting might have cued the pilot to his failure to reset the yaw servo hydraulic switch to its correct position during the preflight hydraulic check, which resulted in a lack of hydraulic boost to the pedal controls, high pedal forces, and a subsequent loss of control after takeoff. Contributing to the accident was the pilot's failure to perform a hover check after liftoff, which would have alerted him to the pedal control anomaly at an altitude that could have allowed him to safely land the helicopter. Contributing to the severity of the injuries was the helicopter's fuel system, which was not crash resistant and facilitated a fuel-fed postcrash fire.

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Design: equipment design](https://openairdocs.org/ntsb-findings/04011010): Organizational issues › Development · Manufacturer (probable cause); cases with it: [American Eurocopter AS350B3, 1 case](https://openairdocs.org/ntsb-findings/04011010/cases.md?model=1145004), [All aircraft, 35 cases](https://openairdocs.org/ntsb-findings/04011010/cases.md)
- [Design: design of document/info](https://openairdocs.org/ntsb-findings/04011020): Organizational issues › Development · Manufacturer (probable cause); cases with it: [American Eurocopter AS350B3, 1 case](https://openairdocs.org/ntsb-findings/04011020/cases.md?model=1145004), [All aircraft, 11 cases](https://openairdocs.org/ntsb-findings/04011020/cases.md)
- [Hydraulic power system](https://openairdocs.org/ntsb-findings/01022900): Aircraft › Aircraft systems · Design (probable cause); cases with it: [American Eurocopter AS350B3, 1 case](https://openairdocs.org/ntsb-findings/01022900/cases.md?model=1145004), [All aircraft, 22 cases](https://openairdocs.org/ntsb-findings/01022900/cases.md)
- [Hydraulic power system: hydraulic, indicating system](https://openairdocs.org/ntsb-findings/01022930): Aircraft › Aircraft systems · Design (probable cause); cases with it: [American Eurocopter AS350B3, 1 case](https://openairdocs.org/ntsb-findings/01022930/cases.md?model=1145004), [All aircraft, 2 cases](https://openairdocs.org/ntsb-findings/01022930/cases.md)
- [Use of equip/info: use of equip/system](https://openairdocs.org/ntsb-findings/02063015): Personnel issues › Task performance · Pilot (probable cause); cases with it: [American Eurocopter AS350B3, 3 cases](https://openairdocs.org/ntsb-findings/02063015/cases.md?model=1145004), [All aircraft, 1,391 cases](https://openairdocs.org/ntsb-findings/02063015/cases.md)
- [Action: forgotten action/omission](https://openairdocs.org/ntsb-findings/02041035): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [American Eurocopter AS350B3, 1 case](https://openairdocs.org/ntsb-findings/02041035/cases.md?model=1145004), [All aircraft, 440 cases](https://openairdocs.org/ntsb-findings/02041035/cases.md)
- [Use of equip/info: use of checklist](https://openairdocs.org/ntsb-findings/02063030): Personnel issues › Task performance · Pilot (probable cause); cases with it: [American Eurocopter AS350B3, 1 case](https://openairdocs.org/ntsb-findings/02063030/cases.md?model=1145004), [All aircraft, 336 cases](https://openairdocs.org/ntsb-findings/02063030/cases.md)
- [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [American Eurocopter AS350B3, 6 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=1145004), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md)
- [Action: lack of action](https://openairdocs.org/ntsb-findings/02041030): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [American Eurocopter AS350B3, 1 case](https://openairdocs.org/ntsb-findings/02041030/cases.md?model=1145004), [All aircraft, 792 cases](https://openairdocs.org/ntsb-findings/02041030/cases.md)
- [Use of equip/info: use of policy/procedure](https://openairdocs.org/ntsb-findings/02063032): Personnel issues › Task performance · Pilot (probable cause); cases with it: [American Eurocopter AS350B3, 1 case](https://openairdocs.org/ntsb-findings/02063032/cases.md?model=1145004), [All aircraft, 191 cases](https://openairdocs.org/ntsb-findings/02063032/cases.md)
- [Fuel system](https://openairdocs.org/ntsb-findings/01022800): Aircraft › Aircraft systems · Design (probable cause); cases with it: [American Eurocopter AS350B3, 1 case](https://openairdocs.org/ntsb-findings/01022800/cases.md?model=1145004), [All aircraft, 181 cases](https://openairdocs.org/ntsb-findings/01022800/cases.md)

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Takeoff: Preflight or dispatch event](https://openairdocs.org/ntsb-events/030); cases with it: [American Eurocopter AS350B3, 1 case](https://openairdocs.org/ntsb-events/030/sequence.md?model=1145004), [All aircraft, 355 cases](https://openairdocs.org/ntsb-events/030/sequence.md)
- [Takeoff: Loss of control in flight](https://openairdocs.org/ntsb-events/240) (defining event); cases with it: [American Eurocopter AS350B3, 8 cases](https://openairdocs.org/ntsb-events/240/sequence.md?model=1145004), [All aircraft, 5,002 cases](https://openairdocs.org/ntsb-events/240/sequence.md)
- [Uncontrolled descent: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [American Eurocopter AS350B3, 8 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=1145004), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md)
- [Post-impact: Fire/smoke (post-impact)](https://openairdocs.org/ntsb-events/170); cases with it: [American Eurocopter AS350B3, 3 cases](https://openairdocs.org/ntsb-events/170/sequence.md?model=1145004), [All aircraft, 354 cases](https://openairdocs.org/ntsb-events/170/sequence.md)

## Analysis

The NTSB's full report is available at http://www.ntsb.gov/investigations/AccidentReports/Pages/AccidentReports.aspx. The Aircraft Accident Report number is NTSB/AAR-17/01. On July 3, 2015, about 1339 mountain daylight time, an Airbus Helicopters AS350 B3e helicopter, N390LG, registered to and operated by Air Methods Corporation, lifted off from the Summit Medical Center Heliport, Frisco, Colorado, and then crashed into a parking lot; the impact point was located 360 feet southwest of the ground-based helipad. The pilot was fatally injured, and the two flight nurses were seriously injured. The helicopter was destroyed by impact forces and a postcrash fire. The flight was conducted under the provisions of 14 Code of Federal Regulations Part 135 on a company flight plan. Visual meteorological conditions prevailed at the time of the accident.

## Factual narrative

The NTSB's full report is available at http://www.ntsb.gov/investigations/AccidentReports/Pages/AccidentReports.aspx. The Aircraft Accident Report number is NTSB/AAR-17/01. On July 3, 2015, about 1339 mountain daylight time, an Airbus Helicopters AS350 B3e helicopter, N390LG, registered to and operated by Air Methods Corporation, lifted off from the Summit Medical Center Heliport, Frisco, Colorado, and then crashed into a parking lot; the impact point was located 360 feet southwest of the ground-based helipad. The pilot was fatally injured, and the two flight nurses were seriously injured. The helicopter was destroyed by impact forces and a postcrash fire. The flight was conducted under the provisions of 14 Code of Federal Regulations Part 135 on a company flight plan. Visual meteorological conditions prevailed at the time of the accident.

## Aircraft

- Registration: [N390LG](https://openairdocs.org/deregistered/N390LG-2016-06-06), registration cancelled 2016-06-06, S/N 7595, built 2013 (OpenAirDocs)
- Reported make and model: AIRBUS HELICOPTERS INC AS350B3E
- Registry model: [American Eurocopter AS350B3](https://openairdocs.org/model/american-eurocopter-as350b3) (registry code 1145004) (OpenAirDocs)
- Registry engine: [Turbomeca ARRIEL-2D](https://openairdocs.org/engine/turbomeca-arriel-2d) (registry code 60080, turbo-shaft) (OpenAirDocs)
- Category: Helicopter
- Serial number: 7595
- Year built: 2013
- Airframe hours: 487.4
- Engines: Turbomeca Arriel 2D 802 horsepower turbo shaft
- Damage: Destroyed
- Fire: On-Ground
- Flight: Part 135
- Operator: Air Methods Corp
- Registered owner: Air Methods Corp
- Airworthiness certificate: Standard, Normal
- Last inspection: AAIP, July 2, 2015
- Departed: 91CO, Frisco, CO
- Destination: Gypsum, CO
- Flight plan: Company VFR
- Airport: 91CO, Summit Medical Center, runway H1, 100 × 100 ft, concrete
- Equipment: Electronic primary flight display, Electronic multifunction display, Data recorder, Onboard weather, Video recording device, Satellite tracking device

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 64; injuries: fatal; airline transport, commercial; airplane ratings: single-engine land; instrument ratings: airplane, helicopter; medical: class 2, with waivers/limitations; last flight review March 22, 2015; seat: front; restraint: 3-point; toxicology performed; flight hours: 13,231 total, 5,231 in this make and model, 13,131 as pilot in command, 20 in the last 90 days, 12 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 280° at 19 knots, gusting 24
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 64 °F, dew point 28 °F
- Altimeter: 30.62 inHg
- Observed at: KCCU, 7 nm away

## 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 20150703023559A](https://openairdocs.org/incident/20150703023559A), Jul 3, 2015: American Eurocopter Corp AS350B3, Frisco, CO, Destroyed, 1 fatal. On July 3, 2015, at 1339 mountain daylight time, an Airbus helicopter inc. (formerly American Eurocopter) AS350B3E helicopter, N390LG, impacted the upper west…

## Docket (53 files)

The files NTSB released with the investigation on August 17, 2016, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=91489. 95.8 MB in all.

- Airworthiness Group Chairman's Factual Report (item 1, .PDF, 16 photos, 3.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443230&FileExtension=.PDF&FileName=Airworthiness%20Group%20Chairman%27s%20Factual%20Report-Master.PDF
- Airworthiness Attachment 1 - SIN 2776-S-29 (item 2, .PDF, 851 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443231&FileExtension=.PDF&FileName=Airworthiness%20Attachment%201%20-%20SIN%202776-S-29-Master.PDF
- Airworthiness Attachment 2 - SB AS350-67.00.64 (item 3, .PDF, 1.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443232&FileExtension=.PDF&FileName=Airworthiness%20Attachment%202%20-%20SB%20AS350-67.00.64-Master.PDF
- Airworthiness Attachment 3 - SB AS360-67.00.66 (item 4, .PDF, 3.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443233&FileExtension=.PDF&FileName=Airworthiness%20Attachment%203%20-%20SB%20AS360-67.00.66-Master.PDF
- Airworthiness Attachment 4 - AD 2015-22-53 (item 5, .PDF, 146 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443234&FileExtension=.PDF&FileName=Airworthiness%20Attachment%204%20-%20AD%202015-22-53-Master.PDF
- Airworthiness Group Chairman's Factual Report Errata (item 6, .PDF, 32 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40451199&FileExtension=.PDF&FileName=Airworthiness%20Group%20Chairman%27s%20Factual%20Report%20Errata-Master.PDF
- Human Performance Factual (item 7, .PDF, 167 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443235&FileExtension=.PDF&FileName=Human%20Performance%20Factual-Master.PDF
- Human Performance Attachment 1 - Interview Summaries (item 8, .PDF, 278 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443236&FileExtension=.PDF&FileName=Human%20Performance%20Attachment%201%20-%20Interview%20Summaries-Master.PDF
- Human Performance Attachment 2 - Interview Transcripts (item 9, .PDF, 949 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443237&FileExtension=.PDF&FileName=Human%20Performance%20Attachment%202%20-%20Interview%20Transcripts-Master.PDF
- Human Performance Attachment 3 - AS350B3e Checklists (item 10, .PDF, 429 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443238&FileExtension=.PDF&FileName=Human%20Performance%20Attachment%203%20-%20AS350B3e%20Checklists-Master.PDF
- Human Performance Attachment 4 - GOM Risk Assessment Program (item 11, .PDF, 214 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443239&FileExtension=.PDF&FileName=Human%20Performance%20Attachment%204%20-%20GOM%20Risk%20Assessment%20Program-Master.PDF
- Human Performance Attachment 5 - AS350 Differences Training Table (item 12, .PDF, 172 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443240&FileExtension=.PDF&FileName=Human%20Performance%20Attachment%205%20-%20AS350%20Differences%20Training%20Table-Master.PDF
- Human Performance Attachment 6 - Test Plan and Results (item 13, .PDF, 230 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443241&FileExtension=.PDF&FileName=Human%20Performance%20Attachment%206%20-%20Test%20Plan%20and%20Results-Master.PDF
- Airbus SIN-2992-S-00 (item 14, .PDF, 532 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40451200&FileExtension=.PDF&FileName=Airbus%20SIN-2992-S-00-Master.PDF
- Meteorology Group Chairman's Factual Report (item 15, .PDF, 12.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443242&FileExtension=.PDF&FileName=Meteorology%20Group%20Chairman%27s%20Factual%20Report-Master.PDF
- Meteorology Attachment 1 - Visible Satellite Loop (item 16, .PDF, 88 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443243&FileExtension=.PDF&FileName=Meteorology%20Attachment%201%20-%20Visible%20Satellite%20Loop-Master.PDF
- Meteorology Attachment 2 - Radar Loop for KFTG (0.9) (item 17, .PDF, 88 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443244&FileExtension=.PDF&FileName=Meteorology%20Attachment%202%20-%20Radar%20Loop%20for%20KFTG%20(0.9)-Master.PDF
- Meteorology Attachment 3 - Radar Loop for KFTG (1.3) (item 18, .PDF, 88 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443245&FileExtension=.PDF&FileName=Meteorology%20Attachment%203%20-%20Radar%20Loop%20for%20KFTG%20(1.3)-Master.PDF
- Meteorology Attachment 4 - WRF Hortizontal Speed Animation (North to South) (item 19, .PDF, 88 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443246&FileExtension=.PDF&FileName=Meteorology%20Attachment%204%20-%20WRF%20Hortizontal%20Speed%20Animation%20%20(North%20to%20South)-Master.PDF
- Meteorology Attachment 5 - WRF Horizontal Speed Animation (West to East) (item 20, .PDF, 88 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443247&FileExtension=.PDF&FileName=Meteorology%20Attachment%205%20-%20WRF%20Horizontal%20Speed%20Animation%20(West%20to%20East)-Master.PDF
- Meteorology Attachment 6 - WRF Vertical Speed Animation (North to South) (item 21, .PDF, 88 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443248&FileExtension=.PDF&FileName=Meteorology%20Attachment%206%20-%20WRF%20Vertical%20Speed%20Animation%20(North%20to%20South)-Master.PDF
- Meteorology Attachment 7 - WRF Vertical Speed Animation (West to East) (item 22, .PDF, 88 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443796&FileExtension=.PDF&FileName=Meteorology%20Attachment%207%20-%20WRF%20Vertical%20Speed%20Animation%20(West%20to%20East)-Master.PDF
- Meteorology Attachment 8 - WRF Relative Humidity Animation (West to East) (item 23, .PDF, 88 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443250&FileExtension=.PDF&FileName=Meteorology%20Attachment%208%20-%20WRF%20Relative%20Humidity%20Animation%20(West%20to%20East)-Master.PDF
- Performance Study (item 24, .PDF, 4 photos, 1.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443251&FileExtension=.PDF&FileName=Performance%20Study-Master.PDF
- Video Study (item 25, .PDF, 3 photos, 132 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443252&FileExtension=.PDF&FileName=Video%20Study-Master.PDF
- Onboard Image Recorder Factual Report (item 26, .PDF, 9 photos, 830 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443253&FileExtension=.PDF&FileName=Onboard%20Image%20Recorder%20Factual%20Report-Master.PDF
- Onboard Image Recorder Attachment 1 - University Report (item 27, .PDF, 5.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443254&FileExtension=.PDF&FileName=Onboard%20Image%20Recorder%20Attachment%201%20-%20University%20Report-Master.PDF
- Onboard Image Recorder Attachment 2 - CT Scan Report (Appareo) (item 28, .PDF, 758 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443255&FileExtension=.PDF&FileName=Onboard%20Image%20Recorder%20Attachment%202%20-%20CT%20Scan%20Report%20(Appareo)-Master.PDF
- Digital Engine Control Unit Factual Report (item 29, .PDF, 6 photos, 419 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443256&FileExtension=.PDF&FileName=Digital%20Engine%20Control%20Unit%20Factual%20Report-Master.PDF
- Flight Data Monitoring Data - Specialist's Study (item 30, .PDF, 187 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40451201&FileExtension=.PDF&FileName=Flight%20Data%20Monitoring%20Data%20-%20Specialist%27s%20Study-Master.PDF
- Materials Laboratory Report - Collective Switches (item 31, .PDF, 831 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443257&FileExtension=.PDF&FileName=Materials%20Laboratory%20Report%20-%20Collective%20Switches-Master.PDF
- Computed Tomography Specialist's Factual Report (item 32, .PDF, 24 photos, 7.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443258&FileExtension=.PDF&FileName=Computed%20Tomography%20Specialist%27s%20Factual%20Report-Master.PDF
- Survival Factors 6 – Survival Factors Group Chairman’s Factual Report (item 33, .PDF, 2.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443259&FileExtension=.PDF&FileName=Survival%20Factors%206%20%E2%80%93%20Survival%20Factors%20Group%20Chairman%E2%80%99s%20Factual%20Report-Master.PDF
- Medical Factual Report (item 34, .PDF, 175 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443260&FileExtension=.PDF&FileName=Medical%20Factual%20Report-Master.PDF
- Toxicological Report - Mahany (item 35, .PDF, 171 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443261&FileExtension=.PDF&FileName=Toxicological%20Report%20-%20Mahany-Master.PDF
- Injury Factual Report (item 36, .PDF, 357 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443262&FileExtension=.PDF&FileName=Injury%20Factual%20Report-Master.PDF
- Witness Statements (item 37, .PDF, 965 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443263&FileExtension=.PDF&FileName=Witness%20Statements-Master.PDF
- Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 38, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40452727&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF
- Flight for Life Morning Briefing Transcript (item 39, .PDF, 39 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443265&FileExtension=.PDF&FileName=Flight%20for%20Life%20Morning%20Briefing%20Transcript-Master.PDF
- OCC Transcripts (item 40, .PDF, 53 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443266&FileExtension=.PDF&FileName=OCC%20Transcripts-Master.PDF
- Air Methods Mechanic Statement (item 41, .PDF, 73 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443267&FileExtension=.PDF&FileName=Air%20Methods%20Mechanic%20Statement-Master.PDF
- Maintenance Records (item 42, .PDF, 43.0 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443268&FileExtension=.PDF&FileName=Maintenance%20Records-Master.PDF
- Statement of Party Representatives to NTSB Investigation (item 43, .PDF, 169 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443269&FileExtension=.PDF&FileName=Statement%20of%20Party%20Representatives%20to%20NTSB%20Investigation-Master.PDF
- Safety Recommendation Transmittal Letter A-16-008-010 (item 44, .PDF, 34 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443270&FileExtension=.PDF&FileName=Safety%20Recommendation%20Transmittal%20Letter%20A-16-008-010-Master.PDF
- Safety Recommendation Report A-16-008 through A-16-011 (item 45, .PDF, 125 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443271&FileExtension=.PDF&FileName=Safety%20Recommendation%20Report%20A-16-008%20through%20A-16-011-Master.PDF
- Safety Recommendation Transmittal Letter A-16-011 (item 46, .PDF, 30 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40443272&FileExtension=.PDF&FileName=Safety%20Recommendation%20Transmittal%20Letter%20A-16-011-Master.PDF
- Errata Medical Factual Report (item 47, .PDF, 423 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40451202&FileExtension=.PDF&FileName=Errata%20Medical%20Factual%20Report-Master.PDF
- Release of Aircraft Wreckage, NTSB Form 6120.15 (item 48, .PDF, 47 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40451203&FileExtension=.PDF&FileName=Release%20of%20Aircraft%20Wreckage,%20NTSB%20Form%206120.15-Master.PDF
- Air Methods Submission (item 49, .PDF, 429 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40451204&FileExtension=.PDF&FileName=Air%20Methods%20Submission-Master.PDF
- Airbus Helicopter Submission (item 50, .PDF, 203 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40451205&FileExtension=.PDF&FileName=Airbus%20Helicopter%20Submission-Master.PDF
- Professional Helicopter Pilots Association International Submission (item 51, .PDF, 86 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40451206&FileExtension=.PDF&FileName=Professional%20Helicopter%20Pilots%20Association%20International%20Submission-Master.PDF
- ASR-16-02 corrected (item 52, .PDF, 65 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40453753&FileExtension=.PDF&FileName=ASR-16-02%20CORRECTED-Master.PDF
- NTSB - Adopted Board Report (item 53, .PDF, 5 photos, 1.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40451208&FileExtension=.PDF&FileName=NTSB%20-%20Adopted%20Board%20Report-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.

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