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Last updated: 28 January 2022
Status:Definitief
Datum:zaterdag 23 december 1972
Tijd:16:34
Type:Silhouette image of generic F28 model; specific model in this crash may look slightly different
Fokker F-28 Fellowship 1000
Luchtvaartmaatschappij:Braathens SAFE
Registratie: LN-SUY
Constructienummer: 11011
Bouwjaar: 1969-04-14 (3 years 8 months)
Aantal vlieguren:8228
Aantal vluchten:16710
Motoren: 2 Rolls-Royce Spey 555-15
Bemanning:slachtoffers: 3 / inzittenden: 3
Passagiers:slachtoffers: 37 / inzittenden: 42
Totaal:slachtoffers: 40 / inzittenden: 45
Schade: Vernield
Gevolgen: Written off (damaged beyond repair)
Plaats:16 km (10 mijl) W of Oslo-Fornebu Airport (FBU) (   Noorwegen)
Fase: Nadering (APR)
Soort vlucht:Binnenlandse lijnvlucht
Vliegveld van vertrek:Ålesund-Vigra Airport (AES/ENAL), Noorwegen
Vliegveld van aankomst:Oslo-Fornebu Airport (FBU/ENFB), Noorwegen
Vluchtnummer:BU239
Beschrijving:
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

Bronnen:
» Willem Wendt


Foto's

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
 

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

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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