ASN logo
ASN Wikibase Occurrence # 172073
Last updated: 11 August 2019
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information. If you feel this information is incomplete or incorrect, you can submit corrected information.

Date:30-NOV-2014
Time:13:20
Type:Silhouette image of generic AT76 model; specific model in this crash may look slightly different
ATR 72-500 (72-212A)
Owner/operator:Braathens Regional opf Gotlandsflyg
Registration: SE-MDB
C/n / msn: 822
Fatalities:Fatalities: 0 / Occupants: 55
Other fatalities:0
Aircraft damage: Minor
Location:Visby Airport (VBY/ESSV) -   Sweden
Phase: Approach
Nature:Domestic Scheduled Passenger
Departure airport:Stockholm-Bromma Airport (BMA/ESSB)
Destination airport:Visby Airport (VBY/ESSV)
Narrative:
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

Safety recommendations:

Safety recommendation RL 2016:07 R1 issued 20 October 2016 by SHK to EASA


Images:

Photo of SE-MDB courtesy AirHistory.net


Helsinki - Vantaa (EFHK / HEL)
10 October 2018; (c) Pertti Sipilš


Revision history:

Date/timeContributorUpdates
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