ASN Wikibase Occurrence # 65369
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| Date: | Monday 3 September 2001 |
| Time: | c. 08:49 |
| Type: |  Bell 206B-3 Jet Ranger III |
| Owner/operator: | Emerald Pacific Airlines |
| Registration: | B-31135 |
| MSN: | 3644 |
| Year of manufacture: | 1982 |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Taichung -
 Taiwan
|
| Phase: | En route |
| Nature: | Calibration/Inspection |
| Departure airport: | Taichung Shui-nan Airport |
| Investigating agency: | ASC |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter was being used to clean electrical power lines, however, as it moved away from the power line on its way to replenish its supply of cleaning fluid, its tail rotor struck the line. The helicopter crashed at a field while en route. One pilot and one water jet operator were killed, helicopter was destroyed by impact force.
Findings related to the probable causes
1. The aircraft was in the temporary operation area, during the fourth flight abnormal sounds occurred in the engine flameout suspected; it passed civilian houses then descended to the left, disintegrated and crashed after striking the power cable.
2. Massive amount of water got into the end section of the aircraft’s fuel system, laboratory tests had proved that the fluid
collected contained 96~98% of water.
3. According to the actual test result with another 250C-30 engine (the engine model of the accident aircraft was 250C-20), when water content in the fuel reached 30~50%, the engine would flame out.
4. The Operation and Aircraft Maintenance Manuals of the engine type mentioned “when fuel is contaminated with water or other contaminants, engine flameout or power lost could occur”.
5. Test result showed the water content at the bottom of the fuel truck tank reached 99.9%, judgment could be made that the fuel truck did not conduct water drain operation that day.
6. The engine of the aircraft operated normally within 99 minutes after started, crashed four minutes after the first refuel.
7. The filament curling phenomenon of “Engine Flameout Warning Light” indicated the engine could lose power during the accident.
8. When the aircraft conducted forced landing, due to the possibility of losing power and insufficient safe altitude, after the tail boom hooked and struck the electric cable, it crashed and disintegrated.
Accident investigation:
 |
|
Sources:
1. http://web.archive.org/web/20060508185406/http://www.asc.gov.tw:80/asc_en/accident_list_2.asp?accident_no=96
2. Final Report: https://www.ttsb.gov.tw/media/3400/asc-aar-02-07-001.pdf
3. Summary : https://www.ttsb.gov.tw/media/3073/b31135_summary.pdf
Images:
Photo: ASC
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Jun-2009 11:44 | harro | Added |
| 26-Aug-2016 23:31 | Dr.John Smith | Updated [Cn, Total fatalities, Total occupants, Other fatalities, Phase, Nature, Source, Narrative] |
| 26-Aug-2016 23:32 | Dr.John Smith | Updated [Aircraft type] |
| 31-Aug-2020 16:35 | KagurazakaHanayo | Updated [Nature, Departure airport, Source] |
| 31-Aug-2020 16:39 | harro | Updated [Time, Nature, Source, Narrative, Photo, Accident report, ] |
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