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| Date: | Friday 23 January 2015 |
| Time: | |
| Type: |  Pilatus PC-12/47 |
| Owner/operator: | Jetfly Aviation |
| Registration: | LX-JFM |
| MSN: | 812 |
| Year of manufacture: | 2007 |
| Engine model: | P&W Canada PT6A-67 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Other fatalities: | 0 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Saint Étienne-Bouthéon Airport (EBU/LFMH) -
 Switzerland
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | Valence-Chabeuil Airport (VAF/LFLU) |
| Saint Étienne-Bouthéon Airport (EBU/LFMH) | |
| Investigating agency: | STSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
As part of a flight qualification extension flight, the crew carried out an NDB approach to runway 18 at Saint-Étienne. Approximately thirty seconds before passing the EB beacon with the de-icing and anti-icing systems engaged, the crew felt oscillations along the pitch axis with an increase in amplitude. Suddenly, a movement to the right along the yaw axis followed by an opposite movement occurred. The crew activated the autopilot and the pilot on duty felt strong vibrations in the controls along the pitch axis. As the crew had seen the ground intermittently during the approach, they decided to initiate a descent to visual flight conditions by increasing speed. At around 800 ft above ground level (AGL), visual references were acquired and the aircraft landed normally with an excess speed of 20 kt.
In the parking area, the correct operation of the pneumatic de-icing system (boots) was checked. The crew noted that an icing horn 4 to 5 cm thick remained on the horizontal stabilizer in a place where there were no boots.
Accident investigation:
 |
|
Sources:
STSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Jul-2024 06:10 | ASN | Added |
| 27-Aug-2024 19:15 | ASN | Updated [Total fatalities, Total occupants, Location, Phase, Departure airport, Destination airport, Source, Damage, Narrative, ] |
| 27-Aug-2024 19:16 | ASN | Updated [Operator, Location, ] |
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