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| Date: | Monday 31 March 2025 |
| Time: | 07:00 UTC |
| Type: |  de Havilland Canada DHC-8-402Q Dash 8 |
| Owner/operator: | Luxair |
| Registration: | LX-LGN |
| MSN: | 4426 |
| Year of manufacture: | 2012 |
| Engine model: | P&W Canada PW150 |
| Fatalities: | Fatalities: 0 / Occupants: |
| Other fatalities: | 0 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | over Val de Bagnes (VS) -
 Switzerland
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Milano-Malpensa Airport (MXP/LIMC) |
| Luxembourg-Findel Airport (LUX/ELLX) | |
| Investigating agency: | STSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
During a flight over the Valais Alps, the crew of a twin-engine turboprop airliner noticed that the low oil pressure warning light had come on.
The affected engine was idled and the aircraft performed a drift down descent, followed by a landing in Geneva (LSGG). After landing, it was found that the skin of the fuselage and the engine nacelle of the affected engine were heavily contaminated with oil. The subsequent technical investigation revealed that the oil tank cap was not installed. The oil tank cap was found in the engine nacelle
Sources:
https://www.sust.admin.ch/inhalte/AV-Praeventions-Bulletins/Praeventions-Bulletin_2025_2_e.pdf
https://globe.adsbexchange.com/?icao=4d00d4&lat=45.952&lon=7.040&zoom=10.1&showTrace=2025-03-31&trackLabels
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Aug-2025 07:28 | ASN | Added |
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