Accident Convair CV-990-30A-5 Coronado EC-BNM,

ASN Wikibase Occurrence # 331257

Date:	Monday 5 January 1970
Time:	22:25
Type:	Convair CV-990-30A-5 Coronado
Owner/operator:	Spantax
Registration:	EC-BNM
MSN:	30-10-32
Year of manufacture:	1962
Total airframe hrs:	16940 hours
Engine model:	General Electric CJ805-23
Fatalities:	Fatalities: 5 / Occupants: 10
Aircraft damage:	Destroyed, written off
Category:	Accident
Location:	ca 1 km SW of Stockholm-Arlanda Airport (ARN) - Sweden
Phase:	Initial climb
Nature:	Ferry/positioning
Departure airport:	Stockholm-Arlanda Airport (ARN/ESSA)
Destination airport:	Zürich-Kloten Airport (ZRH/LSZH)
Confidence Rating:	Accident investigation report completed and information captured

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.

Sources:

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

Location

Images:

photo (c) Kjell Nilsson; Stockholm-Arlanda Airport (ARN); 17 May 1970