Beschrijving:
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 date: 31-01-2005
type: ATR 42-320
registration: OY-JRJ
| Status: | Accident investigation report completed and information captured |
| Datum: | maandag 31 januari 2005 |
| Tijd: | 11:28 |
| Type: |  ATR 42-320 |
| Luchtvaartmaatschappij: | Danish Air Transport |
| Registratie: | OY-JRJ |
| Constructienummer: | 036 |
| Bouwjaar: | 1986 |
| Aantal vlieguren: | 27526 |
| Aantal vluchten: | 23695 |
| Motoren: | 2 Pratt & Whitney Canada PW121 |
| Bemanning: | slachtoffers: 0 / inzittenden: 3 |
| Passagiers: | slachtoffers: 0 / inzittenden: 22 |
| Totaal: | slachtoffers: 0 / inzittenden: 25 |
| Schade: | Licht |
| Gevolgen: | Repaired |
| Plaats: | Bergen-Flesland Airport (BGO) ( Noorwegen)
|
| Fase: | Start (TOF) |
| Soort vlucht: | Binnenlandse lijnvlucht |
| Vliegveld van vertrek: | Bergen-Flesland Airport (BGO/ENBR), Noorwegen |
| Florø Airport (FRO/ENFL), Noorwegen | |
| Vluchtnummer: | 54 |
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.
Probable Cause:
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:
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Veiligheidsmaatregelen
AIBN issued 2 Safety Recommendations
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Foto's
accident date: 31-01-2005
type: ATR 42-320
registration: OY-JRJ
Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Bergen-Flesland Airport en Florø Airport bedraagt 143 km (89 miles).
De afstand tussen Bergen-Flesland Airport en Florø Airport bedraagt 143 km (89 miles).
This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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