# NTSB CEN11WA412: McDonnell Douglas Helicopter 369E, Glastonbury, United Kingdom, June 19, 2011

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Foreign investigation
- Date: June 19, 2011, 14:20 local (14:20 UTC)
- Place: Glastonbury, United Kingdom
- Coordinates: 51.148334, -2.713888 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=51.1483&lon=-2.7139&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Defining event: [Enroute-cruise: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Led by another country's authority
- NTSB office: Central Region
- Lead agency: Other
- Parties: Air Accidents Investigation Branch (AAIB)
- NTSB case key (mKey): 80860
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN11WA412
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/80860/pdf
- Page: https://openairdocs.org/ntsb/CEN11WA412

## Findings

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

- [Rotorcraft flight control: tail rotor control system](https://openairdocs.org/ntsb-findings/01046720): Aircraft › Aircraft propeller/rotor · Failure (probable cause); cases with it: [All aircraft, 13 cases](https://openairdocs.org/ntsb-findings/01046720/cases.md)

## Sequence of events

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

- [Enroute-cruise: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330) (defining event); cases with it: [All aircraft, 994 cases](https://openairdocs.org/ntsb-events/330/sequence.md)
- [Enroute-cruise: Loss of tail rotor effectiveness](https://openairdocs.org/ntsb-events/242); cases with it: [All aircraft, 100 cases](https://openairdocs.org/ntsb-events/242/sequence.md)
- [Emergency descent: Off-field or emergency landing](https://openairdocs.org/ntsb-events/440); cases with it: [All aircraft, 3,365 cases](https://openairdocs.org/ntsb-events/440/sequence.md)

## Factual narrative

On June 19, 2011, at 1420 universal coordinated time (UTC), a McDonnell Douglas Helicopter Company model 369E, United Kingdom registration G-KSWI, s/n 0204E, was substantially damaged during an emergency landing after experiencing a mechanical failure of the tail-rotor control system near Glastonbury, United Kingdom. The helicopter was substantially damaged and the pilot was seriously injured during the accident. The investigation is under the jurisdiction of the United Kingdom Government. Further information may be obtained from: Department for Transport Air Accident Investigation Branch (AAIB) Farnborough House Berkshire Copse Road Aldershot, Hampshire GU11 2HH, United Kingdom Phone: +44 (0) 1252 510300 Fax: +44 (0) 1252 376999 E-mail: investigations@aaib.gov.uk Webpage: http://www.aaib.gov.uk This report is for informational purposes only and contains only information released by or obtained from the Air Accident Investigation Branch (AAIB).

## Aircraft

- Registration: G-KSWI (not matched to a registry record)
- Reported make and model: McDonnell Douglas Helicopter 369E
- Category: Helicopter
- Serial number: 0204E
- Engines: Rolls-Royce 250-C20B 420 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Personal, Non-U.S., non-commercial
- Departed: Yeovilton
- Destination: Cornwall
- Flight plan: Unknown

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; injuries: serious; seat: left

## Weather

- Conditions: Visual (VMC), Day

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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