ASN Wikibase Occurrence # 189807
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| Date: | Monday 9 October 2006 |
| Time: | 14:31 |
| Type: |  Agusta A109A Hirundo |
| Owner/operator: | DNH Helicopters Ltd |
| Registration: | G-DNHI |
| MSN: | 7154 |
| Year of manufacture: | 1979 |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | 2nm W of Biggin Hill Airport, near Bromley, Kent -
 United Kingdom
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Redhill Aerodrome, Redhill, Surrey (EGKR) |
| Biggin Hill, Kent (BQH/EGKB) | |
| Investigating agency: | AAIB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During cruise flight, an engine exhaust duct separated from the helicopter and struck the tail rotor assembly, causing the tail rotor gearbox to also separate. After an initial yaw to the right, the pilot regained limited control. However, a further sudden yaw, possibly associated with a partial structural failure of the upper vertical stabiliser, prompted an immediate autorotative descent, which culminated in a successful forced landing. The investigation established that a clamp attaching an exhaust duct to the left engine had failed, due to stress corrosion cracking, allowing the duct to disconnect from the engine. Two safety recommendations are made.
Accident investigation:
 |
|
Sources:
https://www.gov.uk/aaib-reports/agusta-a109a-g-dnhi-9-october-2006
https://abpic.co.uk/pictures/registration/G-DNHI
History of this aircraft
Other occurrences involving this aircraft
| 9 April 1988 | N33SV | Rocky Mountain Helicopters | 0 | Sioux Falls, SD |  |
sub |
Media:
On 9 Oct 2006 a A109A pilot had a lucky escape when an engine exhaust duct separated and struck the tail rotor assembly, causing the tail rotor gearbox to also separate. https://t.co/sLUEJ50qmr #helicopter #flightsafety #aviationsafety pic.twitter.com/sUeTjDABJs
— Aerossurance (@Aerossurance) October 12, 2021
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Sep-2016 17:07 | Dr.John Smith | Added |
| 04-Sep-2016 17:08 | Dr.John Smith | Updated [Nature] |
| 12-Oct-2021 19:44 | Aerossurance | Updated [Aircraft type, Source, Narrative] |
| 12-Oct-2021 19:58 | Aerossurance | Updated [Embed code] |
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