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| Date: | Saturday 24 April 2010 |
| Time: | 07:33 |
| Type: |  de Havilland Canada DHC-8-102A |
| Owner/operator: | Olympic Air |
| Registration: | SX-BIO |
| MSN: | 330 |
| Year of manufacture: | 1992 |
| Engine model: | P&W Canada PW120 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Other fatalities: | 0 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Bristol Airport (BRS/EGGD) -
 United Kingdom
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | East Midlands Airport (EMA/EGNX) |
| Exeter Airport (EXT/EGTE) | |
| Investigating agency: | AAIB |
| Confidence Rating: |  Accident investigation report completed and information captured |
After a base maintenance check at Exeter the aircraft was flown uneventfully to East Midlands to be repainted. During the return flight to Exeter the right engine suffered a significant oil leak and lost oil pressure, so the flight crew shut it down. Subsequently, the crew noticed the left engine also leaking oil, with a fluctuating oil pressure, so they initiated a diversion to Bristol, where they landed safely. The oil leaks were traced to damaged O-ring seals within the oil cooler fittings on both engines. Both oil coolers had been removed and refitted during the base maintenance check at Exeter. It was probably during re-installation that the O-ring seals were damaged. A number of factors led to this damage and to missed oil leak checks.
Conclusions
The oil leaks from both engines were caused by damaged O-ring seals at the oil cooler fittings. This damage probably occurred when both oil coolers were improperly re-installed by the same individual during base maintenance. The limited repair instructions had resulted in the unnecessary removal of the oil coolers and the re-installation of the coolers had not been identified as safety critical tasks. Following the oil cooler re-installation it was not documented that an oil leak check would be required, due to incomplete planning of the tasks on a ‘defect job card’. The incorrect diagnosis that the slow oil seepage from both engine nacelles was residual oil from a previous leak led to the source of the leaks not being fully investigated at East Midlands
Accident investigation:
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Sources:
https://assets.publishing.service.gov.uk/media/5422f9aaed915d137100075b/Bombardier_DHC-8-102__SX-BIO_06-11.pdf
https://www.jetphotos.com/photo/6835275 (Photo)
History of this aircraft
Other occurrences involving this aircraft
| 8 January 1993 | N826MA | Mesaba Aviation, Inc. | 0 | Detroit, MI |  |
non |
Location
Images:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Nov-2016 19:32 | harro | Added |
| 08-Mar-2025 13:26 | Justanormalperson | Updated [Departure airport, Destination airport, Source, Damage, ] |
| 08-Mar-2025 13:28 | ASN | Updated [Departure airport, Narrative, Accident report, ] |
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