ASN Wikibase Occurrence # 172433
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| Date: | Thursday 18 December 2014 |
| Time: | 15:40 LT |
| Type: |  Bell 206B-3 Jet Ranger |
| Owner/operator: | Emerald Pacific Airlines |
| Registration: | B-31019 |
| MSN: | 4653 |
| Year of manufacture: | 2008 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Location: | 15nm SW Taichung Airport -
 Taiwan
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Survey |
| Departure airport: | |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
A Bell 206B3 helicopter, registration B-31019, suffered a loss of engine power during washing insulators of power cables. A forced landing was made on a grass field about 15 nm southwest of Taichung Airport. The B-31019 departed with 1 pilot and 1 hydraulic nozzle operator aboard, both of the 2 members were suffered minor injuries. The helicopter was suffered substantial damage with landing gears broken and tail boom bent.
indings related to probable causes:
The aircraft loss of engine power was determined the separation of the 3rd stage blade of engine compressor. The probable causes of blade separation are: （1） an airfoil fracture initiating in a corrosion pit, which then progressed in high cycle fatigue until the blade separated in overload, or （2） blade tip rub caused by delamination of the case plastic lining due to corrosion underneath the vane outer band.
The probable cause of the corrosion of the compressor is the improper compressor maintenance during operation in a corrosive environment. The M250-C20 Series engine Operation and Maintenance Manual contains warnings that: salt laden humidity and chemicals will corrode compressor blades and vanes and cause them to fail.
Nine safety recommendations.
Sources:
https://www.asc.gov.tw/main_en/docDetail.aspx?uid=318&pid=318&docid=730
https://www.asc.gov.tw/main_en/docaccident.aspx?uid=344&pid=296&acd_no=186
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Dec-2014 16:05 | harro | Added |
| 22-Nov-2015 20:26 | Iceman 29 | Updated [Source, Narrative] |
| 30-Jan-2016 10:36 | Aerossurance | Updated [Time, Location, Nature, Source, Narrative] |
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