Narrative:While travelling at 95 knots during takeoff from San'a International Airport, an explosion was felt, followed by shimmy and vibrations. The crew, thinking a tyre had exploded, aborted the takeoff. The explosion was in fact caused by an uncontained failure of the stage 1 HP compressor disk of the no. 2 engine. Debris punctured the fuel tank, causing a fire on the right hand side of the aircraft. The propagation of a low cycle fatigue crack on one of the embossments of the disk rim caused the disk fracture.
|Date:||Wednesday 17 March 1982|
|C/n / msn:|| 070|
|First flight:|| 1979-02-22 (3 years )|
|Total airframe hrs:||9053|
|Engines:|| 2 General Electric CF6-50C2|
|Crew:||Fatalities: 0 / Occupants: 13|
|Passengers:||Fatalities: 0 / Occupants: 111|
|Total:||Fatalities: 0 / Occupants: 124 |
|Airplane damage:|| Destroyed|
|Airplane fate:|| Written off (damaged beyond repair)|
|Location:||San'a International Airport (SAH) ( Yemen)
|Crash site elevation:|| 2199 m (7215 feet) amsl |
|Phase:|| Takeoff (TOF)|
|Nature:||International Scheduled Passenger|
|Departure airport:||San'a International Airport (SAH/ODSN), Yemen|
|Destination airport:||Cairo International Airport (CAI/HECA), Egypt|
Probable Cause:CAUSES: "The accident directly resulted from the uncontained explosion of a first stage high pressure turbine disk of the right hand engine. The propagation of a low cycle fatigue crack on one of the embossments of the disk rim was at the origin of the disk fracture.
This cracks, which existed before, had not been detected during the inspection conducted in the operator's workshops, according to the method defined by the manufacturer and in accordance with the requirements of the airworthiness authority. The investigations showed that it was necessary, not only to reduce the intervals between the inspections of these disks and conduct two independent sequential inspections, but also to modify the design and make sure they were progressively replaced by the new type. It seems obvious that the limit life validation methods used at the time of the accident, were still insufficient, as far as the probability of non-detection of cracks was concerned."
Uncontained engine failure
Follow-up / safety actions
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 San'a International Airport to Cairo International Airport as the crow flies is 2077 km (1298 miles).