Narrative:
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: 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.
Loss of control
» ICAO Accident Digest Circular 118-AN/88 (25-42)
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5
registration: EC-BNM
| Status: | Accident investigation report completed and information captured |
| Date: | Monday 5 January 1970 |
| Time: | 22:25 |
| Type: |  Convair CV-990-30A-5 Coronado |
| Operator: | Spantax |
| Registration: | EC-BNM |
| MSN: | 30-10-32 |
| First flight: | 1962 |
| Total airframe hrs: | 16940 |
| Engines: | 4 General Electric CJ805-23 |
| Crew: | Fatalities: 5 / Occupants: 10 |
| Passengers: | Fatalities: 0 / Occupants: 0 |
| Total: | Fatalities: 5 / Occupants: 10 |
| Aircraft damage: | Destroyed |
| Aircraft fate: | Written off (damaged beyond repair) |
| Location: | ca 1 km SW of Stockholm-Arlanda Airport (ARN) ( Sweden)
|
| Crash site elevation: | 42 m (138 feet) amsl |
| Phase: | Initial climb (ICL) |
| Nature: | Ferry/positioning |
| Departure airport: | Stockholm-Arlanda Airport (ARN/ESSA), Sweden |
| Zürich-Kloten Airport (ZRH/LSZH), Switzerland |
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.
Classification:
Windshear/downdraftLoss of control
Sources:
» Flight International 15 January 70(76)» ICAO Accident Digest Circular 118-AN/88 (25-42)
Photos
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5 Coronado
registration: EC-BNM
accident date: 05-01-1970
type: Convair CV-990-30A-5
registration: EC-BNM
Map
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 Stockholm-Arlanda Airport to Zürich-Kloten Airport as the crow flies is 1475 km (922 miles).
Accident location: Approximate; accuracy within a few kilometers.
Distance from Stockholm-Arlanda Airport to Zürich-Kloten Airport as the crow flies is 1475 km (922 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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