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Last updated: 26 October 2020
Statuts:Enquête Officielle
Date:lundi 5 janvier 1970
Heure:22:25
Type/Sous-type:Silhouette image of generic CV99 model; specific model in this crash may look slightly different
Convair CV-990-30A-5 Coronado
Compagnie:Spantax
Immatriculation: EC-BNM
Numéro de série: 30-10-32
Année de Fabrication: 1962
Heures de vol:16940
Moteurs: 4 General Electric CJ805-23
Equipage:victimes: 5 / à bord: 10
Passagers:victimes: 0 / à bord: 0
Total:victimes: 5 / à bord: 10
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:ca 1 km SW of Stockholm-Arlanda Airport (ARN) (   Suède)
Élévation des lieux de l'accident: 42 m (138 feet) amsl
Phase de vol: En montée initiale (ICL)
Nature:Convoyage
Aéroport de départ:Stockholm-Arlanda Airport (ARN/ESSA), Suède
Aéroport de destination:Zürich-Kloten Airport (ZRH/LSZH), Suisse
Détails:
During the takeoff for a charter flight to Palma de Mallorca the no. 4 engine developed problems. The takeoff was aborted and the aircraft returned to the gate. Inspection of the engine revealed damage to the compressor.
It was decided to perform a three-engine ferry flight to Zürich for an engine-change. At 22:24 hours the aircraft started its takeoff roll on runway 19. During the takeoff roll, the nose yawed to the right. This was corrected by retarding no. 1 engine power from 85% to 80-60%. The aircraft rotated at 134 knots with 27 degrees flaps. While climbing, the aircraft banked 4-6 degrees to the right and the airspeed suddenly dropped to 10 knots below V2 (145kts). The Convair contacted some treetops, banked 10-15deg and crashed 1800 m from the point of lift-off.

Probable Cause:

PROBABLE CAUSE: During a 3-engine take-off the aircraft entered an uncontrollable attitude with increased drag and decreased indicated airspeed owing to the following combined circumstances:
- Unexpected, early loss of external visual references after lift off. During transition from visual to instrument flying the pilot lost directional control, this again resulting in increased drag due to yaw. The presence of a temperature inversion reducing thrust and indicated airspeed.
- The presence of wind shear causing further decrease of indicated airspeed, which resulted in large drag increase.

Sources:
» Flight International 15 January 70(76)
» ICAO Accident Digest Circular 118-AN/88 (25-42)


Photos

photo of Convair-CV-990-30A-5-Coronado-EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
photo of Convair-CV-990-30A-5-Coronado-EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
photo of Convair-CV-990-30A-5-Coronado-EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
photo of Convair-CV-990-30A-5-Coronado-EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
photo of Convair-CV-990-30A-5-Coronado-EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
photo of Convair-CV-990-30A-5-Coronado-EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
photo of Convair-CV-990-30A-5-EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5
registration: EC-BNM
 

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 Stockholm-Arlanda Airport et Zürich-Kloten Airport est de 1475 km (922 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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