ASN logo
Last updated: 11 April 2021
Statuts:Enquête Officielle
Date:vendredi 6 mai 1988
Heure:20:30
Type/Sous-type:Silhouette image of generic DHC7 model; specific model in this crash may look slightly different
de Havilland Canada DHC-7-102
Compagnie:Widerøes Flyveselskap
Immatriculation: LN-WFN
Numéro de série: 28
Année de Fabrication: 1980
Heures de vol:16934
Cycles:32347
Moteurs: 4 Pratt & Whitney Canada PT6A-50
Equipage:victimes: 3 / à bord: 3
Passagers:victimes: 33 / à bord: 33
Total:victimes: 36 / à bord: 36
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:8 km (5 milles) SW of Brønnøysund Airport (BNN) (   Norvège)
Élévation des lieux de l'accident: 171 m (561 feet) amsl
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Namsos Airport (OSY/ENNM), Norvège
Aéroport de destination:Brønnøysund Airport (BNN/ENBN), Norvège
Numéro de vol:WF710
Détails:
Widerøe flight 710 took off from Trondheim (TRD), Norway, at 19:23 local time on a domestic light to Namsos (OSY), Brønnøysund (BNN), Sandnessjøen (SSJ) and Bodø Airport (BOO).
The flight to Namsos was uneventful. The aircraft took off from Namsos at 20:07 and contacted Trondheim ACC six minutes later, stating that they were climbing from FL70 to FL90. At 20:20 the crew began their descent for Brønnøysund and switched frequencies to Brønnøysund AFIS.
Weather reported at Brønnøysund was: wind 220°/05 kts, visibility 9 km, 3/8 stratus at 600 feet and 6/8 at 1000 feet, temperature +6 C, QNH 1022 MB.
The crew executed a VOR/DME approach to Brønnøysund's runway 04, followed by a circle for landing on runway 22. The crew left the prescribed altitude 4 NM early. The aircraft descended until it flew into the Torghatten hillside at 560 feet.

A retired police officer reported in July 2013 that a passenger had taken a mobile phone on board. The police officer disembarked the plane at Namsos, a stop-over and reported that the passenger with the mobile phone was seated in the cockpits jump-seat.
After the accident, he reported this fact to the Joint Rescue Coordination Centre (JRCC). After reading the investigation report during the 25th anniversary of the accident, he noticed that there was no mention of the mobile phone.
NMT 450 network-based mobiles at the time were fitted with a 15-watt transmitter and a powerful battery which could lead to disruption in electronic equipment.
The Norwegian AIB conducted an investigation to determine if electronic interference from the mobile phone might have affected the flight instruments. The AIB concluded that there was no evidence to support the theory that there was any kind of interference.

Probable Cause:

The cause of the accident was that the last part of the approach was started about 4 NM too soon. The aircraft therefore flew below the safe terrain clearance altitude and crashed into rising terrain. The Board cannot indicate any certain reason why the approach started so early.

Accident investigation:
cover
Investigating agency: Flyhavarikommisjon
Status: Investigation completed
Duration: 1 year and 4 months
Accident number: 4-89
Download report: Final report


Photos

photo of DHC-7-102-LN-WFN
approach profile; lines AIP and WIF show the AIP Norway and the Widerøe step-down procedures
photo of DHC-7-102-LN-WFN
accident date: 06-05-1988
type: de Havilland Canada DHC-7-102
registration: LN-WFN
 

Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Namsos Airport et Brønnøysund Airport est de 114 km (71 miles).
Accident location: Exact; as reported in the official accident report.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
languages: languages

Share

DHC-7

  • 113 built
  • 2ème loss
  • 2ème accident fatal
  • le accident The le plus grave (à ce moment là)
  • le accident The le plus grave (en ce moment)
» safety profile

 Norvège
  • le accident 3ème le plus grave (à ce moment là)
  • le accident 4ème le plus grave (en ce moment)
» safety profile