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ASN Wikibase Occurrence # 147906
Last updated: 22 May 2018
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Date:19-AUG-2012
Time:03:42 UTC
Type:Silhouette image of generic AT72 model; specific model in this crash may look slightly different
ATR 72-500 (72-212A)
Owner/operator:Flybe Nordic
Registration: OH-ATH
C/n / msn: 769
Fatalities:Fatalities: 0 / Occupants: 31
Other fatalities:0
Airplane damage: Minor
Location:Helsinki-Vantaa Airport (HEL/EFHK) -   Finland
Phase: Landing
Nature:Domestic Scheduled Passenger
Departure airport:Tampere
Destination airport:Helsinki-Vantaa Airport (HEL/EFHK)
Narrative:
Veered off the runway during landing following a rudder control failure.
The Finnish Accident Investigation Board classified this as a serious incident and launched an investigation.

Probable cause and consequence
The serious incident was caused by the mechanically centred rudderís insufficient authority for directional control, which resulted in the aircraft veering off the runway.
Contributing factors
The rudderís Travel Limitation Unit (TLU) electric actuator broke and the TLU was left in the high speed (HI SPD) mode for the approach and landing, jamming the rudder.
Due to inadequate system awareness and the fact that the QRH did not clearly enough provide instructions for using the TLUís standby system, the flight crew did not switch on the TLUís standby system.
The right engineís propeller blade angles transitioned sooner into the BETA zone following the reduction of engine power at landing, which resulted in a large directional oscillation.

Sources:

http://www.turvallisuustutkinta.fi/Etusivu/Ajankohtaista/1342537306217
http://www.turvallisuustutkinta.fi/en/Etusivu/Ajankohtaista/Valmistuneettutkinnattiedotteet/1368802952710


Revision history:

Date/timeContributorUpdates
24-Aug-2012 08:48 harro Added
01-Nov-2013 19:13 harro Updated [Time, Total occupants, Nature, Departure airport, Source, Narrative]

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