ASN Wikibase Occurrence # 175577
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| Date: | Thursday 16 April 2015 |
| Time: | 12:27 |
| Type: |  Britten-Norman BN-2B-20 Islander |
| Owner/operator: | Roc Aviation Company |
| Registration: | B-68802 |
| MSN: | 2241 |
| Year of manufacture: | 1991 |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Minor |
| Location: | near Taitung Airport (TTT) -
 Taiwan
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Taitung Airport (TTT/RCFN) |
| Taipei-Sung Shan Airport (TSA/RCSS) | |
| Investigating agency: | ASC |
| Confidence Rating: |  Accident investigation report completed and information captured |
An Roc Aviation Company (RAC) BN-2B-20 Islander aircraft, operated on a ferry flight from Taitung to Taipei.
After took off the generator warning light illuminated and the left engine rpm dropped. The flight crew judged that the left engine had failed. Therefore, emergency procedures were performed, and flight crew requested to return Taitung Airport. After inspection, the left engine damage was found.
Findings related to probable causes:
A post occurrence examination found that 5 out of 8 stud bolt nuts were not at their positions. During engine overhaul, under torque condition might exist when number 3 cylinder was installed. This caused insufficient tightness of number 3 cylinder and crankcase connection. The accumulated flight hours of left engine were more than 1,400 hours. Long term operation of engine and axial movement of piston led to the looseness of stud bolt nuts. Some stud bolt nuts might be separated before the occurrence to produce vibration at the mating surface of number 3 cylinder and crankcase during engine operation. Subsequent bending or fracture of stud bolts thus caused the separation of number 3 cylinder from crankcase and then damaged to left engine.
Accident investigation:
 |
|
Sources:
http://www.asc.gov.tw/upload/acd_att/B-68802%20Executive%20Summary.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Apr-2015 19:34 | harro | Added |
| 21-May-2016 06:38 | harro | Updated [Time, Cn, Total occupants, Source, Narrative] |
| 05-Jun-2021 14:31 | harro | Updated [Accident report] |
| 27-Nov-2021 09:59 | TB | Updated [Location, Source, Narrative] |
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