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- Code Number:
- TAFV41P01_13
- Title:
-
Partnair, LN-PAA, Convair CV-580
- CN: 56
Engines: 2x Allison 501-D13 Built: 1953 Total airframe hours: 36943 Cycles: 15116 wo 08/09/1989 North Sea (Skageraki) enroute FBU Accident report: Status: Final Date: Friday 08/09/1989 Time: 16:38 Crew: Fatalities: 5 / Occupants: 5 Passengers: Fatalities: 50 / Occupants: 50 Total: Fatalities: 55 / Occupants: 55 Airplane damage: Destroyed Airplane fate: Written off (damaged beyond repair) Location: 18 kilometers (11.3 miles) North of Hirtshals [Skagerrak] Denmark Phase: En route (ENR) Nature: International Non Scheduled Passenger Flight Departure airport: Oslo-Fornebu Airport (FBU/ENFB), Norway Destination airport: Hamburg-Fuhlsbuttel Airport (HAM/EDDH), Germany Flight number: 394 Narrative: Convair CV-580 LN-PAA was performing a charter from Oslo-Fornebu (FBU) Norway to Hamburg (HAM) Germany. The flight was scheduled to depart at 15:00 hours. The departure was delayed by almost a full hour due to the CAA Norway and the catering company having suspended Partnair's credit. Once the financial problem was settled the crew was given permission to fly. During the time of September 6-8, 1989 this aircraft experienced some technical problems with the left AC power system. The AC generator was replaced, but the malfunction in the system remained. On the flight to Hamburg it was decided to use the APU generator as the electrical power source for the left AC system. LN-PAA took off at 15:59:50. The flight proceeded normally to the planned cruise level of FL 220. At 16:04 Flight 394 was cleared direct to AAL VOR/DME (Aalborg). When the airplane climbed through FL 180 at time 16:16, the crew was informed by Oslo ACC about strong westerly winds at altitude. The air traffic controller suggested a 101 heading change to the right. At 16:22 Flight 394 was informed that the radar service from Oslo ACC terminated and that the flight would enter Danish-controlled air space within 2 minutes. The flight was then instructed to contact Copenhagen ACC. The airplane reached its cruising level at time 16:23. Half a minute later the crew established contact with Copenhagen ACC and informed them that PAR 394 was maintaining FL 220, whereupon Copenhagen ACC confirmed radar contact. This was the last radio contact with the flight. The flight proceeded normally until about 16:38. Vibrations occurred in the vertical stabilizer. These vibrations developed into violent oscillations or flutter of the horizontal tail surfaces and rudder. Vital parts of the tail section then failed and the crew lost control of the airplane. Both wings failed simultaneously under negative G loads. The Convair fell into the sea. CAUSES: "The accident was caused by loss of control due to the destruction of primary control surfaces in the tail section, which, in turn, was caused by aeroelastic oscillations initiated by abnormal clearances in the vertical stabiliser attachments to the fuselage structure. The condition of the attachments was a result of excessive wear in pins and sleeves used in this structural joint. The pins and sleeves were of an inferior quality and did not satisfy specified values for hardness and tensile strength. They had also been installed and inspected using sub-standard maintenance procedures. Undamped oscillations in the elevator contributed to the structural failure of the empenage." Sources: Aviation Week & Space Technology 29.03.1993 (32-33) Flight International 31.3-6.4.93(13) ICAO Adrep Summary 5/89 (#23)
- Keywords:
-
Convair Propliner, Twin Engine Prop, Regional Airliner, Fixed wing multi engine, multi-engine, low-wing, Convairliner, Propeller, Plane, Avion, History, Technology, Fleet, Livery, Equipment, hull, Public, Airframe, Transport, Fixed-Wing, Commerce, Travel, Airplane, Archive, Airline, Aerospace, Civil Transportation, Passenger Aircraft, Commercial Aviation, Airliner
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