# NTSB DCA12MA020: Eurocopter France AS350B2, N37SH, Las Vegas, NV, December 8, 2011

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Class 1 · Major · Final report
- Date: December 7, 2011, 16:30 local (Dec 8, 2011, 00:30 UTC)
- Place: Las Vegas, NV
- Coordinates: 36.169597, -115.119041 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=36.1696&lon=-115.1190&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Defining event: [Enroute-cruise: Part(s) separation from AC](https://openairdocs.org/ntsb-events/338)
- Highest injury: Fatal
- Injuries: 5 fatal
- Status: Completed, report February 20, 2013
- Report: Board-adopted at Board Meeting
- Investigation class: Class 1
- NTSB office: Major Investigations Division
- Safety recommendations: Yes
- NTSB case key (mKey): 82479
- NTSB case page: https://www.ntsb.gov/investigations/Pages/DCA12MA020.aspx
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/82479/pdf
- Board report AAR1301 (PDF): https://www.ntsb.gov/investigations/AccidentReports/Reports/AAR1301.pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=82479
- Page: https://openairdocs.org/ntsb/DCA12MA020

## Probable cause

Sundance Helicopters’ inadequate maintenance of the helicopter, including (1) the improper reuse of a degraded self-locking nut, (2) the improper or lack of installation of a split pin, and (3) inadequate postmaintenance inspections, which resulted in the in-flight separation of the servo control input rod from the fore/aft servo and rendered the helicopter uncontrollable. Contributing to the improper or lack of installation of the split pin was the mechanic’s fatigue and the lack of clearly delineated maintenance task steps to follow. Contributing to the inadequate postmaintenance inspection was the inspector’s fatigue and the lack of clearly delineated inspection steps to follow.

## Findings

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

- [Rotorcraft flight control: rotorcraft servo system](https://openairdocs.org/ntsb-findings/01046730): Aircraft › Aircraft propeller/rotor · Incorrect service/maintenance (probable cause); cases with it: [Eurocopter France AS350B2, 1 case](https://openairdocs.org/ntsb-findings/01046730/cases.md?model=8680973), [All aircraft, 6 cases](https://openairdocs.org/ntsb-findings/01046730/cases.md)
- [Misc hardware: fasteners](https://openairdocs.org/ntsb-findings/01071430): Aircraft › Fluids/misc hardware · Incorrect service/maintenance (probable cause); cases with it: [Eurocopter France AS350B2, 1 case](https://openairdocs.org/ntsb-findings/01071430/cases.md?model=8680973), [All aircraft, 58 cases](https://openairdocs.org/ntsb-findings/01071430/cases.md)
- [Maintenance: installation](https://openairdocs.org/ntsb-findings/02062035): Personnel issues › Task performance · Maintenance personnel (probable cause); cases with it: [Eurocopter France AS350B2, 1 case](https://openairdocs.org/ntsb-findings/02062035/cases.md?model=8680973), [All aircraft, 371 cases](https://openairdocs.org/ntsb-findings/02062035/cases.md)
- [Inspection: post maintenance inspection](https://openairdocs.org/ntsb-findings/02061515): Personnel issues › Task performance · Maintenance personnel (probable cause); cases with it: [Eurocopter France AS350B2, 1 case](https://openairdocs.org/ntsb-findings/02061515/cases.md?model=8680973), [All aircraft, 57 cases](https://openairdocs.org/ntsb-findings/02061515/cases.md)
- [Rotorcraft flight control: rotorcraft servo system](https://openairdocs.org/ntsb-findings/01046730): Aircraft › Aircraft propeller/rotor · Failure (probable cause); cases with it: [Eurocopter France AS350B2, 1 case](https://openairdocs.org/ntsb-findings/01046730/cases.md?model=8680973), [All aircraft, 6 cases](https://openairdocs.org/ntsb-findings/01046730/cases.md)
- [Performance/control parameters](https://openairdocs.org/ntsb-findings/01062000): Aircraft › Aircraft oper/perf/capability · Attain/maintain not possible (probable cause); cases with it: [Eurocopter France AS350B2, 3 cases](https://openairdocs.org/ntsb-findings/01062000/cases.md?model=8680973), [All aircraft, 1,269 cases](https://openairdocs.org/ntsb-findings/01062000/cases.md)
- [Alertness/Fatigue](https://openairdocs.org/ntsb-findings/02013500): Personnel issues › Physical · Maintenance personnel (probable cause); cases with it: [Eurocopter France AS350B2, 1 case](https://openairdocs.org/ntsb-findings/02013500/cases.md?model=8680973), [All aircraft, 48 cases](https://openairdocs.org/ntsb-findings/02013500/cases.md)
- [Policy/procedure: availability of policy/proc](https://openairdocs.org/ntsb-findings/04021010): Organizational issues › Management · Operator (probable cause); cases with it: [Eurocopter France AS350B2, 1 case](https://openairdocs.org/ntsb-findings/04021010/cases.md?model=8680973), [All aircraft, 28 cases](https://openairdocs.org/ntsb-findings/04021010/cases.md)

## Sequence of events

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

- [Prior to flight: Aircraft maintenance event](https://openairdocs.org/ntsb-events/040); cases with it: [Eurocopter France AS350B2, 1 case](https://openairdocs.org/ntsb-events/040/sequence.md?model=8680973), [All aircraft, 484 cases](https://openairdocs.org/ntsb-events/040/sequence.md)
- [Enroute-cruise: Part(s) separation from AC](https://openairdocs.org/ntsb-events/338) (defining event); cases with it: [Eurocopter France AS350B2, 1 case](https://openairdocs.org/ntsb-events/338/sequence.md?model=8680973), [All aircraft, 563 cases](https://openairdocs.org/ntsb-events/338/sequence.md)
- [Enroute-cruise: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330); cases with it: [Eurocopter France AS350B2, 1 case](https://openairdocs.org/ntsb-events/330/sequence.md?model=8680973), [All aircraft, 994 cases](https://openairdocs.org/ntsb-events/330/sequence.md)
- [Uncontrolled descent: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Eurocopter France AS350B2, 4 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=8680973), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md)

## Analysis

The Safety Board’s full report is available at http://www.ntsb.gov/investigations/reports_aviation.html. The Aircraft Accident Report number is NTSB/AAR-13/01. On December 7, 2011, about 1630 Pacific standard time, a Sundance Helicopters, Inc., Eurocopter AS350-B2 helicopter, N37SH, operating as a “Twilight tour” sightseeing trip, crashed in mountainous terrain about 14 miles east of Las Vegas, Nevada. The pilot and four passengers were killed, and the helicopter was destroyed by impact forces and postimpact fire. The helicopter was registered to and operated by Sundance as a scheduled air tour flight under the provisions of 14 Code of Federal Regulations (CFR) Part 135. Visual meteorological conditions with good visibility and dusk light prevailed at the time of the accident, and the flight operated under visual flight rules. The helicopter originated from Las Vegas McCarran International Airport, Las Vegas, Nevada, about 1621 with an intended route of flight to the Hoover Dam area and return to the airport. The helicopter was not equipped, and was not required to be equipped, with any on board recording devices.

## Factual narrative

The Safety Board’s full report is available at http://www.ntsb.gov/investigations/reports_aviation.html. The Aircraft Accident Report number is NTSB/AAR-13/01. On December 7, 2011, about 1630 Pacific standard time, a Sundance Helicopters, Inc., Eurocopter AS350-B2 helicopter, N37SH, operating as a “Twilight tour” sightseeing trip, crashed in mountainous terrain about 14 miles east of Las Vegas, Nevada. The pilot and four passengers were killed, and the helicopter was destroyed by impact forces and postimpact fire. The helicopter was registered to and operated by Sundance as a scheduled air tour flight under the provisions of 14 Code of Federal Regulations (CFR) Part 135. Visual meteorological conditions with good visibility and dusk light prevailed at the time of the accident, and the flight operated under visual flight rules. The helicopter originated from Las Vegas McCarran International Airport, Las Vegas, Nevada, about 1621 with an intended route of flight to the Hoover Dam area and return to the airport. The helicopter was not equipped, and was not required to be equipped, with any on board recording devices.

## Aircraft

- Registration: [N37SH](https://openairdocs.org/deregistered/N37SH-2017-09-08), registration cancelled 2017-09-08, S/N 2300, built 1989 (OpenAirDocs)
- Reported make and model: EUROCOPTER FRANCE AS350B2
- Registry model: [Eurocopter France AS350B2](https://openairdocs.org/model/eurocopter-france-as350b2) (registry code 8680973) (OpenAirDocs)
- Registry engine: [Turbomeca ARRIEL-1SER](https://openairdocs.org/engine/turbomeca-arriel-1ser) (registry code 60030, turbo-shaft) (OpenAirDocs)
- Category: Helicopter
- Serial number: 2300
- Engines: TURBOMECA ARRIEL 1SER 681 horsepower turbo shaft
- Damage: Destroyed
- Fire: On-Ground
- Flight: Part 135
- Operator: Sundance Helicopters Inc
- Registered owner: Sundance Helicopters Inc
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, December 6, 2011, 4 hours before
- Departed: LAS, Las Vegas, NV
- Destination: LAS, Las Vegas, NV
- Flight plan: Company VFR
- Airport: LAS, Las Vegas McCarren

## Weather

- Conditions: Visual (VMC), Dusk
- Wind: 200° at 4 knots
- Visibility: 10 statute miles
- Temperature: 54 °F, dew point 10 °F
- Altimeter: 30.13 inHg
- Observed at: KLAS, 14 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 20111207028539A](https://openairdocs.org/incident/20111207028539A), Dec 7, 2011: Eurocopter France AS350B2, Las Vegas, NV, Destroyed, 5 fatal. The aircraft came out of 100 hour inspection, inspected and signed off to fly. Test flown by maintenance pilot and released to fly air tours. The aircraft flew…

## Docket (94 files)

The files NTSB released with the investigation on June 15, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=82479. 159 MB in all.

- Operations 2 - Factual Report of Group Chairman (item 1, .PDF, 2.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369220&FileExtension=.PDF&FileName=Operations%202%20-%20Factual%20Report%20of%20Group%20Chairman-Master.PDF
- Operations 2 - Attachment 1 Pilot Operator Report NTSB Form 6120 (item 2, .PDF, 7.0 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369223&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%201%20Pilot%20Operator%20Report%20NTSB%20Form%206120-Redacted.PDF
- Operations 2 - Attachment 2 Twilight Tour Description with Flight Track Overlay (item 3, .PDF, 245 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369224&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%202%20Twilight%20Tour%20Description%20with%20Flight%20Track%20Overlay-Master.PDF
- Operations 2 - Attachment 3 Spidertrack Raw Data for Accident Flight (N37SH) (item 4, .PDF, 149 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369225&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%203%20Spidertrack%20Raw%20Data%20for%20Accident%20Flight%20(N37SH)-Master.PDF
- Operations 2 - Attachment 4 National Park Service Incident Record of Telephone Interviews (item 5, .PDF, 2.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369226&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%204%20National%20Park%20Service%20Incident%20Record%20of%20Telephone%20Interviews-Redacted.PDF
- Operations 2 - Attachment 5 Sundance Pilot Statements (item 6, .PDF, 1.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369227&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%205%20Sundance%20Pilot%20Statements-Redacted.PDF
- Operations 2 - Attachment 6 Sundance Chief Pilot Statement (item 7, .PDF, 462 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369228&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%206%20Sundance%20Chief%20Pilot%20Statement-Master.PDF
- Operations 2 - Attachment 7 Pilot's Training Records (item 8, .PDF, 3.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369229&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%207%20Pilot%27s%20Training%20Records-Redacted.PDF
- Operations 2 - Attachment 8 Pilot's Flight and Duty Time Records (item 9, .PDF, 3.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369231&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%208%20Pilot%27s%20Flight%20and%20Duty%20Time%20Records-Redacted.PDF
- Operations 2 - Attachment 9 Pilot's Archived Flight Tracks (item 10, .PDF, 868 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369233&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%209%20Pilot%27s%20Archived%20Flight%20Tracks-Master.PDF
- Operations 2 - Attachment 10 Weight and Balance Sheet for the Accident Flight (N37SH) (item 11, .PDF, 181 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369234&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%2010%20Weight%20and%20Balance%20Sheet%20for%20the%20Accident%20Flight%20(N37SH)-Master.PDF
- Operations 2 - Attachment 11 Sundance Approved Operations Specifications (OpsSpecs) (item 12, .PDF, 2.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369236&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%2011%20Sundance%20Approved%20Operations%20Specifications%20(OpsSpecs)-Redacted.PDF
- Operations 2 - Attachment 12 Sundance General Operations Manual (GOM) Chapter 6 Flight Operations (item 13, .PDF, 4.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369237&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%2012%20Sundance%20General%20Operations%20Manual%20(GOM)%20Chapter%206%20Flight%20Operations-Master.PDF
- Operations 2 - Attachment 13 AS350B2 Rotorcraft Flight Manual (RFM) Section 4 Normal Procedures (item 14, .PDF, 581 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369238&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%2013%20AS350B2%20Rotorcraft%20Flight%20Manual%20(RFM)%20Section%204%20Normal%20Procedures-Master.PDF
- Operations 2 - Attachment 14 AS350B2 Rotorcraft Flight Manual (RFM) Section 8-4 Daily Operating Checks (item 15, .PDF, 582 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369240&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%2014%20AS350B2%20Rotorcraft%20Flight%20Manual%20(RFM)%20Section%208-4%20Daily%20Operating%20Checks-Master.PDF
- Operations 2 - Attachment 15 AS350B2 Rotorcraft Flight Manual (RFM) Section 8-3 Flight Test Sheets (item 16, .PDF, 581 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369246&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%2015%20AS350B2%20Rotorcraft%20Flight%20Manual%20(RFM)%20Section%208-3%20Flight%20Test%20Sheets-Master.PDF
- Operations 2 - Attachment 16 AS350B2 Rotorcraft Flight Manual (RFM) Supplement 14 (item 17, .PDF, 373 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369247&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%2016%20AS350B2%20Rotorcraft%20Flight%20Manual%20(RFM)%20Supplement%2014-Master.PDF
- Operations 2 - Attachment 17 Sundance Expanded External Checks Checklist (item 18, .PDF, 3.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369413&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%2017%20Sundance%20Expanded%20External%20Checks%20Checklist-Master.PDF
- Operations 2 - Attachment 18 External Safety Audits (DOD and TOPS) (item 19, .PDF, 2.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369416&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%2018%20External%20Safety%20Audits%20(DOD%20and%20TOPS)-Redacted.PDF
- Operations 2 - Attachment 19 Internal Safety Audit (SMS) (item 20, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369418&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%2019%20Internal%20Safety%20Audit%20(SMS)-Redacted.PDF
- Operations 2 - Attachment 20 Letter from Sundance Helicopters to NTSB (item 21, .PDF, 1.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369422&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%2020%20Letter%20from%20Sundance%20Helicopters%20to%20NTSB-Redacted.PDF
- Operations 2 - Attachment 21 Sundance Safety Memorandum Outlining Post Accident Safety Initiatives (item 22, .PDF, 308 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369423&FileExtension=.PDF&FileName=Operations%202%20-%20Attachment%2021%20Sundance%20Safety%20Memorandum%20Outlining%20Post%20Accident%20Safety%20Initiatives-Master.PDF
- Operations 2 - Photo 1 Pilot Conducting a Preflight Inspection of the Left MGB Area (item 23, .PDF, 1.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369452&FileExtension=.PDF&FileName=Operations%202%20-%20Photo%201%20Pilot%20Conducting%20a%20Preflight%20Inspection%20of%20the%20Left%20MGB%20Area-Master.PDF
- Operations 2 - Photo 2 Left MGB Inspection Area (item 24, .PDF, 1.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369454&FileExtension=.PDF&FileName=Operations%202%20-%20Photo%202%20Left%20MGB%20Inspection%20Area-Master.PDF
- Operations 2 - Photo 3 Fore-Aft Servo Connecting Hardware Visible through the Cutout of the Ice Boot (item 25, .PDF, 1.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369461&FileExtension=.PDF&FileName=Operations%202%20-%20Photo%203%20Fore-Aft%20Servo%20Connecting%20Hardware%20Visible%20through%20the%20Cutout%20of%20the%20Ice%20Boot-Master.PDF
- Airworthiness Factual Report of Group Chairman (with 7 embedded images) (item 26, .PDF, 7 photos, 5.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40368105&FileExtension=.PDF&FileName=Airworthiness%20Factual%20Report%20of%20Group%20Chairman%20(with%207%20embedded%20images)-Master.PDF
- Airworthiness Factual Report of Group Chairman - Addendum 1 (with 2 embedded images) (item 27, .PDF, 2 photos, 486 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40383372&FileExtension=.PDF&FileName=Airworthiness%20Factual%20Report%20of%20Group%20Chairman%20-%20Addendum%201%20(with%202%20embedded%20images)-Master.PDF
- Airworthiness Factual Report of Group Chairman - Addendum 1 (with 2 embedded images) (item 28, .PDF, 2 photos, 766 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40374272&FileExtension=.PDF&FileName=Airworthiness%20Factual%20Report%20of%20Group%20Chairman%20-%20Addendum%201%20(with%202%20embedded%20images)-Master.PDF
- Airworthiness Factual Report of Group Chairman - Addendum 1 - Attachment 1 - Meggitt Materials Laboratory Report on Particle Composition (item 29, .PDF, 492 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40372207&FileExtension=.PDF&FileName=Airworthiness%20Factual%20Report%20of%20Group%20Chairman%20-%20Addendum%201%20-%20Attachment%201%20-%20Meggitt%20Materials%20Laboratory%20Report%20on%20Particle%20Composition-Master.PDF
- Airworthiness Factual Report of Group Chairman - Addendum 1 - Attachment 2 - Meggitt Control Systems Test Certificates for Fore/Aft Servo (RX187) and Tail Rotor (FE212) - REDACTED (item 30, .PDF, 2.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40375063&FileExtension=.PDF&FileName=Airworthiness%20Factual%20Report%20of%20Group%20Chairman%20-%20Addendum%201%20-%20Attachment%202%20-%20Meggitt%20Control%20Systems%20Test%20Certificates%20for%20Fore%2FAft%20Servo%20(RX187)%20and%20Tail%20Rotor%20(FE212)%20-%20REDACTED-Master.PDF
- Airworthiness Factual Report of Group Chairman - Addendum 1 - Attachment 3 - Photographs and X-Ray Mosaic Images of Removed Materials (item 31, .PDF, 22 photos, 2.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40383375&FileExtension=.PDF&FileName=Airworthiness%20Factual%20Report%20of%20Group%20Chairman%20-%20Addendum%201%20-%20Attachment%203%20-%20Photographs%20and%20X-Ray%20Mosaic%20Images%20of%20Removed%20Materials-Master.PDF
- Airworthiness Factual Report of Group Chairman - Addendum 1 - Attachment 4 - Photographs of Input Linkage Connection for Servo Commande Actuators (with 4 embedded photographs) (item 32, .PDF, 4 photos, 1.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40382462&FileExtension=.PDF&FileName=Airworthiness%20Factual%20Report%20of%20Group%20Chairman%20-%20Addendum%201%20-%20Attachment%204%20-%20Photographs%20of%20Input%20Linkage%20Connection%20for%20Servo%20Commande%20Actuators%20(with%204%20embedded%20photographs)-Master.PDF
- Airworthiness Factual Report of Group Chairman - Addendum 1 - Attachment 5 - Eurocopter Response to May 11 NTSB Questions (item 33, .PDF, 223 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40374279&FileExtension=.PDF&FileName=Airworthiness%20Factual%20Report%20of%20Group%20Chairman%20-%20Addendum%201%20-%20Attachment%205%20-%20Eurocopter%20Response%20to%20May%2011%20NTSB%20Questions-Master.PDF
- Airworthiness Factual Report of Group Chairman - Addendum 1 - Attachment 6 - Meggitt Control Systems Response to NTSB Question 3 (item 34, .PDF, 80 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40374284&FileExtension=.PDF&FileName=Airworthiness%20Factual%20Report%20of%20Group%20Chairman%20-%20Addendum%201%20-%20Attachment%206%20-%20Meggitt%20Control%20Systems%20Response%20to%20NTSB%20Question%203-Master.PDF
- Computed Tomography Specialist's Factual Report (with 31 embedded images) (item 35, .PDF, 3.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40367689&FileExtension=.PDF&FileName=Computed%20Tomography%20Specialist%27s%20Factual%20Report%20(with%2031%20embedded%20images)-Master.PDF
- Powerplants 8 - Factual Report of Group Chairman with 19 embedded photographs (item 36, .PDF, 19 photos, 1.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40362635&FileExtension=.PDF&FileName=Powerplants%208%20-%20Factual%20Report%20of%20Group%20Chairman%20with%2019%20embedded%20photographs-Master.PDF
- Powerplants 8 - Attachment 1. Maintenance Records Excerpt Engine Life Limited Parts (item 37, .PDF, 41 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40362870&FileExtension=.PDF&FileName=Powerplants%208%20-%20Attachment%201.%20Maintenance%20Records%20Excerpt%20Engine%20Life%20Limited%20Parts-Master.PDF
- Maintenance 11 - Factual Report of Group Chairman (item 38, .PDF, 2 photos, 815 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40365605&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Factual%20Report%20of%20Group%20Chairman-Redacted.PDF
- Maintenance 11 - Attachment 1 Eurocopter 100-hour Requirements (item 39, .PDF, 1.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363683&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%201%20Eurocopter%20100-hour%20Requirements-Master.PDF
- Maintenance 11 - Attachment 2 Eurocopter Standard Practices Manual (item 40, .PDF, 403 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363684&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%202%20Eurocopter%20Standard%20Practices%20Manual-Master.PDF
- Maintenance 11 - Attachment 3 Eurocopter Main Rotor Servo Installation Procedures (item 41, .PDF, 143 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363685&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%203%20Eurocopter%20Main%20Rotor%20Servo%20Installation%20Procedures-Master.PDF
- Maintenance 11 - Attachment 4 Statement of Party Representatives (item 42, .PDF, 3.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363687&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%204%20Statement%20of%20Party%20Representatives-Redacted.PDF
- Maintenance 11 - Attachment 5 SDH GOM and Operations Specifications (item 43, .PDF, 52.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40365733&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%205%20SDH%20GOM%20and%20Operations%20Specifications-Redacted.PDF
- Maintenance 11 - Attachment 6 SDH General Maintenance Manual (item 44, .PDF, 3.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363734&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%206%20SDH%20General%20Maintenance%20Manual-Master.PDF
- Maintenance 11 - Attachment 7 JDA Assessment (item 45, .PDF, 190 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363735&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%207%20JDA%20Assessment-Redacted.PDF
- Maintenance 11 - Attachment 8 DOD Audit (item 46, .PDF, 2.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363737&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%208%20DOD%20Audit-Redacted.PDF
- Maintenance 11- Attachment 9 DOD Response (item 47, .PDF, 393 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363739&FileExtension=.PDF&FileName=Maintenance%2011-%20Attachment%209%20DOD%20Response-Redacted.PDF
- Maintenance 11 - Attachment 10 TOPS Inspection (item 48, .PDF, 386 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363741&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2010%20TOPS%20Inspection-Redacted.PDF
- Maintenance 11 - Attachment 11 Cotter Pin Reference (item 49, .PDF, 292 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363743&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2011%20Cotter%20Pin%20Reference-Master.PDF
- Maintenance 11 - Attachment 12 Malmrose Heli Services, Inc. Vendor Questionnaire (item 50, .PDF, 365 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363744&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2012%20Malmrose%20Heli%20Services,%20Inc.%20Vendor%20Questionnaire-Redacted.PDF
- Maintenance 11 - Attachment 13 Report Showing Last Bolt Change N351WM (item 51, .PDF, 144 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40365731&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2013%20Report%20Showing%20Last%20Bolt%20Change%20N351WM-Redacted.PDF
- Maintenance 11 - Attatchment 14 Eurocopter Flight Manual Section 8 (item 52, .PDF, 299 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363769&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attatchment%2014%20Eurocopter%20Flight%20Manual%20Section%208-Master.PDF
- Maintenance 11 - Attachment 15 N37SH 100-hour Inspection Record (item 53, .PDF, 3.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363746&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2015%20N37SH%20100-hour%20Inspection%20Record-Redacted.PDF
- Maintenance 11 - Attachment 16 Torque Stripe Training (item 54, .PDF, 4.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363747&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2016%20Torque%20Stripe%20Training-Redacted.PDF
- Maintenance 11 - Attachment 17 Check Pilot Transcript (item 55, .PDF, 264 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363749&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2017%20Check%20Pilot%20Transcript-Master.PDF
- Maintenance 11 - Attachment 18 Day Mechanic Transcript (item 56, .PDF, 90 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363752&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2018%20Day%20Mechanic%20Transcript-Redacted.PDF
- Maintenance 11 - Attachment 19 Engine Mechanic Transcript (item 57, .PDF, 72 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363753&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2019%20Engine%20Mechanic%20Transcript-Master.PDF
- Maintenance 11 - Attachment 20 Tail Rotor Area Mechanic Transcript (item 58, .PDF, 72 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363754&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2020%20Tail%20Rotor%20Area%20Mechanic%20Transcript-Master.PDF
- Maintenance 11 - Attachment 21 Main Rotor Area Mechanic Initial Transcript (item 59, .PDF, 76 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363756&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2021%20Main%20Rotor%20Area%20Mechanic%20Initial%20Transcript-Master.PDF
- Maintenance 11 - Attachment 22 Main Rotor Area Mechanic Follow-up Transcript (item 60, .PDF, 73 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363757&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2022%20Main%20Rotor%20Area%20Mechanic%20Follow-up%20Transcript-Master.PDF
- Maintenance 11 - Attachment 23 Inspector Initial Transcript (item 61, .PDF, 92 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363758&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2023%20Inspector%20Initial%20Transcript-Master.PDF
- Maintenance 11 - Attachment 24 Inspector Follow-up Transcript (item 62, .PDF, 74 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363760&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2024%20Inspector%20Follow-up%20Transcript-Master.PDF
- Maintenance 11 - Attachment 25 Former PMI Record of Conversation (item 63, .PDF, 167 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363761&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2025%20Former%20PMI%20Record%20of%20Conversation-Master.PDF
- Maintenance 11 - Attachment 26 PMI Record of Conversation (item 64, .PDF, 161 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363763&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2026%20PMI%20Record%20of%20Conversation-Master.PDF
- Maintenance 11 - Attachment 27 PAI Record of Conversation (item 65, .PDF, 151 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363764&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2027%20PAI%20Record%20of%20Conversation-Master.PDF
- Maintenance 11 - Attachment 28 SDH Maintenance Record Status (item 66, .PDF, 77 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363772&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2028%20SDH%20Maintenance%20Record%20Status-Master.PDF
- Maintenance 11 - Attachment 29 Fore Aft Servo Overhaul Records (item 67, .PDF, 4.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40366037&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2029%20Fore%20Aft%20Servo%20Overhaul%20Records-Redacted.PDF
- Maintenance 11 - Attachment 30 SDH QAN Replacement of Flight Control Bolts (item 68, .PDF, 123 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40370909&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2030%20SDH%20QAN%20Replacement%20of%20Flight%20Control%20Bolts-Master.PDF
- Maintenance 11 - Attachment 31 Eurocopter Main Rotor Servo Installation (item 69, .PDF, 441 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40378850&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Attachment%2031%20Eurocopter%20Main%20Rotor%20Servo%20Installation-Master.PDF
- Maintenance 11 - Photo 1. Input Rod Installed (item 70, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40370911&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Photo%201.%20Input%20Rod%20Installed-Master.PDF
- Maintenance 11 - Photo 2. Input Rod Close View (item 71, .PDF, 104 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40370913&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Photo%202.%20Input%20Rod%20Close%20View-Master.PDF
- Maintenance 11 - Photo 3. Input Rod with Torque Stripe (item 72, .PDF, 999 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40370914&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Photo%203.%20Input%20Rod%20with%20Torque%20Stripe-Master.PDF
- Maintenance 11 - Addendum 1 (item 73, .PDF, 104 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40382437&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Addendum%201-Master.PDF
- Maintenance 11 - Addendum Attachment 1 Record of Conversation TOPS Auditor (item 74, .PDF, 59 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40370916&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Addendum%20Attachment%201%20Record%20of%20Conversation%20TOPS%20Auditor-Master.PDF
- Maintenance 11 - Addendum Attachment 2 Record of Conversation TOPS (item 75, .PDF, 58 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40370917&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Addendum%20Attachment%202%20Record%20of%20Conversation%20TOPS-Master.PDF
- Maintenance 11 - Addendum Attachment 3 Record of Conversation SDH DOM (item 76, .PDF, 100 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40370918&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Addendum%20Attachment%203%20Record%20of%20Conversation%20SDH%20DOM-Master.PDF
- Maintenance 11 - Errata (item 77, .PDF, 322 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40378852&FileExtension=.PDF&FileName=Maintenance%2011%20-%20Errata-Master.PDF
- Aircraft Performance 13 - Eurocopter responses to performance questions (item 78, .PDF, 38 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369682&FileExtension=.PDF&FileName=Aircraft%20Performance%2013%20-%20Eurocopter%20responses%20to%20performance%20questions-Master.PDF
- Aircraft Performance 13 - Radar targets in kml format (item 79, .TXT, 6 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369711&FileExtension=.txt&FileName=Aircraft%20Performance%2013%20-%20Radar%20targets%20in%20kml%20format-Master.txt
- Human Performance 14 - Factual Report of Specialist (item 80, .PDF, 73 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40366341&FileExtension=.PDF&FileName=Human%20Performance%2014%20-%20Factual%20Report%20of%20Specialist-Master.PDF
- Human Performance 14 - Attachment 1 Interview Summaries (item 81, .PDF, 52 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40366357&FileExtension=.PDF&FileName=Human%20Performance%2014%20-%20Attachment%201%20Interview%20Summaries-Master.PDF
- Human Performance 14 - Attachment 2 Witness Statements (item 82, .PDF, 534 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40366359&FileExtension=.PDF&FileName=Human%20Performance%2014%20-%20Attachment%202%20Witness%20Statements-Redacted.PDF
- Human Performance 14 - Attachment 3 Sundance Director of Safety Report (item 83, .PDF, 477 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40366363&FileExtension=.PDF&FileName=Human%20Performance%2014%20-%20Attachment%203%20Sundance%20Director%20of%20Safety%20Report-Master.PDF
- Human Performance 14 - Attachment 4 Toxicology Report (item 84, .PDF, 225 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40366365&FileExtension=.PDF&FileName=Human%20Performance%2014%20-%20Attachment%204%20Toxicology%20Report-Redacted.PDF
- Materials Laboratory 15 - Factual Report 12-042 Servo (14 images) (item 85, .PDF, 4.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40370157&FileExtension=.PDF&FileName=Materials%20Laboratory%2015%20-%20Factual%20Report%2012-042%20Servo%20(14%20images)-Master.PDF
- Materials Laboratory 15 - Factual Report 12-045 engine components (6 images) (item 86, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40366575&FileExtension=.PDF&FileName=Materials%20Laboratory%2015%20-%20Factual%20Report%2012-045%20engine%20components%20(6%20images)-Master.PDF
- Statement of Party Representatives to NTSB Investigation - Sundance Helicopters (item 87, .PDF, 334 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369699&FileExtension=.PDF&FileName=Statement%20of%20Party%20Representatives%20to%20NTSB%20Investigation%20-%20Sundance%20Helicopters-Redacted.PDF
- Miscellaneous - BEA France Accreditation Letter (item 88, .PDF, 204 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369701&FileExtension=.PDF&FileName=Miscellaneous%20-%20BEA%20France%20Accreditation%20Letter-Redacted.PDF
- Non-Volatile Memory 17 - Specialist's Factual Report on Personal Electronics (item 89, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40370221&FileExtension=.PDF&FileName=Non-Volatile%20Memory%2017%20-%20Specialist%27s%20Factual%20Report%20on%20Personal%20Electronics-Master.PDF
- Miscellaneous - BEA no comments letter (item 90, .PDF, 24 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40387043&FileExtension=.PDF&FileName=Miscellaneous%20-%20BEA%20no%20comments%20letter-Redacted.PDF
- Miscellaneous - Concurring Statement Member Rosekind (item 91, .PDF, 100 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40387044&FileExtension=.PDF&FileName=Miscellaneous%20-%20Concurring%20Statement%20Member%20Rosekind-Master.PDF
- Correspondence - Sundance Helicopters (item 92, .PDF, 987 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40387045&FileExtension=.PDF&FileName=Correspondence%20-%20Sundance%20Helicopters-Master.PDF
- Final Accident Report, Sundance Helicopters (item 93, .PDF, 1.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40389062&FileExtension=.PDF&FileName=Final%20Accident%20Report,%20Sundance%20Helicopters-Master.PDF
- Safety Recommendation letter A-13-001 thru -003 (item 94, .PDF, 82 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40389063&FileExtension=.PDF&FileName=Safety%20Recommendation%20letter%20A-13-001%20thru%20-003-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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