ASN Wikibase Occurrence # 86968
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Monday 27 December 2010 |
| Time: | 11:00 |
| Type: |  Eurocopter AS 332L2 Super Puma Mk2 |
| Owner/operator: | Government Flying Service |
| Registration: | B-HRN |
| MSN: | 2547 |
| Year of manufacture: | 2001 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Minor |
| Category: | Accident |
| Location: | Shing Mun Reservoir -
 Hong Kong
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Fire fighting |
| Departure airport: | Hong Kong-Chek Lap Kok International Airport (HKG) |
| Investigating agency: | CAD Hong Kong |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter was lifting an underslung water bucket filled up with water at Shing Mun Reservoir for fire-fighting operation.
When the helicopter was on transition to forward flight, the No. 2 engine shut down automatically due to an overspeed signal.
The captain decided to ditch the helicopter into the reservoir. All crew members on board evacuated the helicopter without injury.
Casual factors:
1. The automatic shutdown of No.2 engine was due to free turbine overspeed as the result of a slippage of the right freewheel shaft in the MGB.
2. The right freewheel unit slipped because of the unpredicted growth rate of ramp wear and the maximum allowable wear limit of 0.05 mm for the acceptance of the freewheel shaft during the previous MGB overhaul.
3. Due to the deformation of MGB under flight loads and the associated effects on the freewheel rollers, during fire fighting operations the ramp wear grew at a higher rate than those Eurocopter had predicted.
Accident investigation:
 |
|
Sources:
http://www.cad.gov.hk/reports/B-HRN%20Accident%20Report.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Dec-2010 05:25 | hkaiw | Added |
| 27-Dec-2010 05:26 | harro | Updated [Aircraft type, Cn, Total occupants, Location, Narrative] |
| 27-Dec-2010 05:31 | hkaiw | Updated [Time, Aircraft type, Destination airport] |
| 27-Dec-2010 09:48 | TB | Updated [Aircraft type, Cn, Operator, Narrative] |
| 26-Jan-2011 14:28 | harro | Updated [Source, Narrative] |
| 22-Jul-2013 18:43 | harro | Updated [Source, Narrative] |
| 14-May-2021 19:50 | harro | Updated [Accident report] |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation