Accident ATR 42-320 OY-JRJ, Monday 31 January 2005
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Date:Monday 31 January 2005
Time:11:28
Type:Silhouette image of generic AT43 model; specific model in this crash may look slightly different    
ATR 42-320
Owner/operator:Danish Air Transport
Registration: OY-JRJ
MSN: 036
Year of manufacture:1986
Total airframe hrs:27526 hours
Cycles:23695 flights
Engine model:Pratt & Whitney Canada PW121
Fatalities:Fatalities: 0 / Occupants: 25
Other fatalities:0
Aircraft damage: Minor, repaired
Category:Accident
Location:Bergen-Flesland Airport (BGO) -   Norway
Phase: Take off
Nature:Passenger - Scheduled
Departure airport:Bergen-Flesland Airport (BGO/ENBR)
Destination airport:Florø Airport (FRO/ENFL)
Investigating agency: AIBN
Confidence Rating: Accident investigation report completed and information captured
Narrative:
An ATR-42 passenger plane sustained minor damage in an accident at Bergen-Flesland Airport (BGO), Norway. There were no injuries among the 22 passengers and three crew members.
Danish Air Transport flight DTR54 was on a scheduled flight from Bergen to Florø (FRO). During takeoff the pilots experienced considerable control problems related to the elevator function. They declared an emergency situation and returned for landing. The landing was accomplished without further incident 7 minutes after takeoff.
After landing it was found that the control problems were caused by the right elevator hanging below the horizontal stabiliser, attached only by the inboard of the three hinges that normally connect the elevator to the stabiliser. A bolt was missing from both the centre and outer hinges. Both of the bolts and one of the nuts that normally should connect the hinge assemblies together were found. One of the bolts was found on the runway, the other inside the elevator.
Investigation indicates that the bolt belonging to the outer hinge assembly fell out during the takeoff in question, while the bolt in the centre hinge assembly had fallen out at an earlier point in time, without being discovered. The report concludes that the self-locking nuts cannot have been tightened with the required torque when the elevator was fitted. This error was most probably introduced after the aircraft was repainted in 1999.

Significant investigation results:
The control problems experienced by the crew during take-off and the rest of the flight began when the outboard of the three hinge bolts that attach the right elevator to the stabiliser loosened and fell out. As the centre bolt had fallen out at an earlier point in time without being discovered, the elevator was hanging in place only attached by the inboard hinge.
The self-locking nuts that should hold the centre and outboard hinge bolts in place cannot have been tightened with the required torque.

Accident investigation:
cover
  
Investigating agency: AIBN
Report number: 8/2006
Status: Investigation completed
Duration: 1 year and 2 months
Download report: Final report

Sources:


Location

Images:


photo (c) AIBN; Bergen-Flesland Airport (BGO); 31 January 2005; (publicdomain)

Revision history:

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