Unfallbericht: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.
|Datum:||Samstag 23 Dezember 1972|
Fokker F-28 Fellowship 1000
|Baujahr:|| 1969-04-14 (3 years 8 months)|
|Anzahl Zyklen der Zelle:||16710|
|Triebwerk:|| 2 Rolls-Royce Spey 555-15|
|Besatzung:||Todesopfer: 3 / Insassen: 3|
|Fluggäste:||Todesopfer: 37 / Insassen: 42|
|Gesamt:||Todesopfer: 40 / Insassen: 45 |
|Konsequenzen:|| Written off (damaged beyond repair)|
|Unfallort:||16 km (10 Meilen) W of Oslo-Fornebu Airport (FBU) ( Norwegen)
|Flugphase:|| Annäherung (APR)|
|Betriebsart:||Inländischer planmäßiger Passagierflug|
|Flug von:||Ålesund-Vigra Airport (AES/ENAL), Norwegen|
|Flug nach:||Oslo-Fornebu Airport (FBU/ENFB), Norwegen|
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.
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.
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.
» Willem Wendt
Official accident investigation report
|investigating agency: ||Flyhavarikommisjon - Norway |
|report status: ||Final|
|report number: ||Final Report|
|report released:||17 December 1975|
|duration of investigation: ||2 years and 12 months|
|download report: ||
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 Ålesund-Vigra Airport to Oslo-Fornebu Airport as the crow flies is 379 km (237 miles).