Accident description
Last updated: 18 December 2014
Status:Final
Date:Friday 6 May 1988
Time:20:30
Type:de Havilland Canada DHC-7-102
Operator:Widerøes Flyveselskap
Registration: LN-WFN
C/n / msn: 28
First flight: 1980
Total airframe hrs:16934
Cycles:32347
Engines: 4 Pratt & Whitney Canada PT6A-50
Crew:Fatalities: 3 / Occupants: 3
Passengers:Fatalities: 33 / Occupants: 33
Total:Fatalities: 36 / Occupants: 36
Airplane damage: Destroyed
Airplane fate: Written off (damaged beyond repair)
Location:8 km (5 mls) SW of Brønnøysund Airport (BNN) (   Norway) show on map
Crash site elevation: 171 m (561 feet) amsl
Phase: Approach (APR)
Nature:Domestic Scheduled Passenger
Departure airport:Namsos Airport (OSY/ENNM), Norway
Destination airport:Brønnøysund Airport (BNN/ENBN), Norway
Flightnumber: 710
Narrative:
Flight WF710 took off from Trondheim (TRD) at 19:23 on a domestic light to Namsos (OSY), Brønnøysund (BNN), Sandnessjøen (SSJ) and Bodø Airport (BOO).
The flight to Namsos was uneventful. The flight took off 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, and it would 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 cockpit's 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 AIB said it would investigate if electronic interference from the mobile phone may have affected the flight instruments.


PROBABLE CAUSE: "Havariets årsak var at siste del av innflygingen ble påbegynt omlag 4 NM for tidlig. Derved kom flyet under høyden for sikker terrengklaring og kolliderte ned stigende terreng. Kommisjonen kan ikke angi noen sikker grunn til at nedstigningen ble iverksatt så tidlig. Det er imidlertid godtgjort at besetningen ikke gjennomførte en forskriftsmessig flyging, idet den unnlot fullt ut å forholde seg til gjeldende bestemmelser og prosedyrer som forutsatt. Det har i denne forbindelse hos kommisjonen festnet seg den oppfatning at selskapets egenkontroll ikke tilstrekkelig hadde fanget opp visse svakheter knyttet til det foreliggende grunnlagsmateriale og den praksis som forekom. Dette kan ha bevirket at holdningen overfor en sunn 'Cockpit' disiplin og den gjensidige kontroll mellom besetningsmedlemmene var blitt undergravet. Navigeringen av fartøyet ble dermed ikke fulgt opp og tilfredsstillende gjennomført."

Classification:
Controlled Flight Into Terrain (CFIT) - Mountain

Sources:

Official accident investigation report
investigating agency: Flyhavarikommisjon - Norway
report status: Final
report number: 1989/04
report released:28-AUG-1989
duration of investigation:479 days (1 year 3.8 months)
download report: Rapport om luftfartsulykke ved Torghatten nær Brønnøysund den 6, mai 1988 med Dash 7 LN-WFN (Flyhavarikommisjon 1989/04)
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Photos

photo of de Havilland Canada DHC-7-102 LN-WFN
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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Namsos Airport to Brønnøysund Airport as the crow flies is 114 km (71 miles).

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