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Last updated: 28 January 2022
Statuts:Enquête Officielle
Date:samedi 23 décembre 1972
Heure:16:34
Type/Sous-type:Silhouette image of generic F28 model; specific model in this crash may look slightly different
Fokker F-28 Fellowship 1000
Compagnie:Braathens SAFE
Immatriculation: LN-SUY
Numéro de série: 11011
Année de Fabrication: 1969-04-14 (3 years 8 months)
Heures de vol:8228
Cycles:16710
Moteurs: 2 Rolls-Royce Spey 555-15
Equipage:victimes: 3 / à bord: 3
Passagers:victimes: 37 / à bord: 42
Total:victimes: 40 / à bord: 45
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:16 km (10 milles) W of Oslo-Fornebu Airport (FBU) (   Norvège)
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Ålesund-Vigra Airport (AES/ENAL), Norvège
Aéroport de destination:Oslo-Fornebu Airport (FBU/ENFB), Norvège
Numéro de vol:BU239
Détails:
Braathens flight 239 turned some 10 NM ahead of the ILS-procedure for runway 06 at Oslo-Fornebu Airport while the captain was having private communications regarding Christmas with the ACC-controller. The F-28 also descended below MSA and the crew lowered the gear and flaps as it was established on the ILS. It then flew into the woods more than 4 NM off course in darkness and fog.

Probable Cause:

Accident cause (translated from Norwegian):

The probable cause of the aircraft LN-SUY that crashed near Asdoltjern in Asker on 23 December 1972 at 1634:55 was incorrect navigation under a truncated instrument approach to runway 06 at Fornebu.
The fact, which could not to specifed more closely, however, must have been committed when the aircraft left 3500 feet but was not fatal for the last 13 seconds when it was flown 1510 feet below the glide path down while aboard it must have been clear that neither was at or within 2 1/2° from the ILS facility centerline.

Contributing factors:
a) The aircraft's ADF no. 2 was probably tuned to 100 kHz erroneously.
b) Fornebu ILS to runway 06 provides useable glideslope signals from Sylling to the accident site.
c) Outer Marker on Steilene can provide convincing signals for passage of an outer Marker Beacon in apparently correct glidepath altitude between Sylling and the accident site in the F-28 aircraft if "merkefyrbryteren" are put in setting HIGH.

Unfortunate circumstances:
a) The commander was not as rested as he could have been according to regulations
b) The commander made radio calls with air traffic controller in the control tower that were not allowed during the initial phase of the approach.
c) Control tower bearing indicator was moved from its fixed position in the control desk, so that the possibility of random directional control was reduced.
d) Training Position for approach control at Oslo ATCC was unmanned.

Accident investigation:
cover
Investigating agency: Flyhavarikommisjon
Status: Investigation completed
Duration: 3 years
Accident number: Final Report
Download report: Final report

Sources:
» Willem Wendt


Photos

photo of Fokker-F-281000-LN-SUY
accident date: 23-12-1972
type: Fokker F-28 Fellowship 1000
registration: LN-SUY
photo of Fokker-F-281000-LN-SUY
accident date: 23-12-1972
type: Fokker F-28 Fellowship 1000
registration: LN-SUY
 

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 Ålesund-Vigra Airport et Oslo-Fornebu Airport est de 379 km (237 miles).
Accident location: Approximate; accuracy within a few kilometers.

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.
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Fokker F-28

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