ASN Wikibase Occurrence # 172073
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| Date: | 30-NOV-2014 |
| Time: | 13:20 |
| Type: |  ATR 72-500 (72-212A) |
| Owner/operator: | Braathens Regional opf Gotlandsflyg |
| Registration: | SE-MDB |
| MSN: | 822 |
| Fatalities: | Fatalities: 0 / Occupants: 55 |
| Other fatalities: | 0 |
| Aircraft damage: | Minor |
| Location: | Visby Airport (VBY/ESSV) -
 Sweden
|
| Phase: | Approach |
| Nature: | Passenger - Scheduled |
| Departure airport: | Stockholm-Bromma Airport (BMA/ESSB) |
| Visby Airport (VBY/ESSV) | |
| Investigating agency: | SHK Sweden |
| Confidence Rating: |  Accident investigation report completed and information captured |
The commander stated that small vibrations were noted by the crew while descending through about 7000 feet. The indicated airspeed was 250 knots and the throttles were idle.
The vibrations grew and the commander reduced the rate of descent to 2500 feet per minute.
The vibrations were so strong that the cabin crew had difficulty moving in the cabin and it was difficult to read the instruments in the cockpit.
Information from the flight recorders show that the left propeller was feathered only momentarily. Then the right engine (PW127M) was shut down. The flight continued with the left engine in operation. The information also shows that communication between the pilots did not include confirmation of the engine controls being operated.
When the commander brought the right propeller control to the feathered mode, he could not get it into fuel shut-off mode. The lever was therefore returned to the "auto" position, and again via feathering to the off position, the vibrations subsided.
The co-pilot explained the situation to air traffic in Visby tower and declared an emergency.
Causes: Accident Investigation Board has been unable to determine the cause of the serious incident.
There have been six similar incidents. The mechanisms that caused the propeller vibrations have not been determined.
Sources:
http://www.bea.aero/fr/enquetes/2014/2014.semaine.49.pdf
https://www.havkom.se/news.asp?newsID=764&language=2
http://www.helagotland.se/samhalle/kaptenen-gjorde-precis-allt-ratt-10437010.aspx
https://www.havkom.se/assets/reports/RL2016_07-Slutrapport-SE-MDB.pdf
http://aerossurance.com/safety-management/bea-propeller-vibration-atr72/
https://www.bea.aero/index.php?id=40&L=1&news=13629&cHash=def2f4779463ad964fb8fd416d732e3b
Accident investigation:
 |
|
Safety recommendations:
Safety recommendation RL 2016:07 R1 issued 20 October 2016 by SHK to EASA
Images:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Dec-2014 20:41 | harro | Added |
| 11-Dec-2014 06:58 | Masen63 | Updated [Operator, Source] |
| 20-Oct-2016 06:56 | harro | Updated [Total occupants, Narrative] |
| 20-Oct-2016 07:44 | harro | Updated [Location, Narrative] |
| 21-Oct-2016 14:26 | harro | Updated [Photo, ] |
| 30-Jul-2019 20:51 | Aerossurance | Updated [Source] |
| 11-Aug-2019 12:15 | Aerossurance | Updated [Source] |
Corrections or additions? ... Edit this accident description
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