44 Years ago today: On 15 January 1977 a Skyline Sweden Vickers Viscount crashed at Stockholm, Sweden after a stabilizer stall due to icing, killing all 22 occupants.

Date:Saturday 15 January 1977
Time:09:05
Type:Silhouette image of generic VISC model; specific model in this crash may look slightly different
Vickers 838 Viscount
Operating for:Linjeflyg
Leased from:Skyline Sweden
Registration:SE-FOZ
C/n / msn:372
First flight:1961-10-07 (15 years 3 months)
Total airframe hrs:12208
Engines:Rolls-Royce Dart 525F
Crew:Fatalities: 3 / Occupants: 3
Passengers:Fatalities: 19 / Occupants: 19
Total:Fatalities: 22 / Occupants: 22
Aircraft damage:Destroyed
Aircraft fate:Written off (damaged beyond repair)
Location:4,5 km (2.8 mls) NW of Stockholm-Bromma Airport (BMA) (   Sweden)
Phase:Approach (APR)
Nature:Domestic Scheduled Passenger
Departure airport:Jönköping-Axamo Airport (JKG/ESGJ), Sweden
Destination airport:Stockholm-Bromma Airport (BMA/ESSB), Sweden
Flightnumber:LF618

Narrative:
Linjeflyg flight 618 originated at Kristianstad (KID) with stops at Växjö (VXO) and Jönköping (JKG) en route to Stockholm (BMA) in Sweden. On the final leg of the flight, while on approach to Stockholm-Bromma Airport, the aircraft suddenly pitched down from an altitude of 1150 feet. It went into a vertical dive and crashed on a parking lot in the Kälvesta neighbourhood.
Because the no. 2 and no. 3 engines had been running with reduced power for a long time, the anti-ice system temperature was too low.

Probable Cause:

Probable cause (translated from Swedish):
The accidnt was caused by the stabilizer stalling due to the air flow around it being disturbed by ice accretion.
The reason why ice was formed is that the de-icing system’s temperature had been too low due to insufficient power on engines 2 and 3 for a long time. This can be attributed to deficiencies in the pilot’s flight manual regarding the operation of the de-icing system, which, in turn, should be due to deficiencies in the flight manual of the manufacturer’s aviation authority. Insufficient information in the pilot’s flight manual on the effects of ice formation on the stabilizer may also have affected. The pilots have also not been informed of the occurrence of severe ice formation in the Stockholm area.