October 7, 2011
Investigators of the South African CAA released the final report of their investigation into the cause of a September 2009 fatal accident involving a Jetstream 41 twin turboprop airplane at Durban.
The aircraft commenced its take off roll from runway 06 at Durban (DUR) and shortly before it became airborne a catastrophic failure occurred in the nr.2 (right hand) engine due to a fatigue failure of the second stage rotating air seal. It continued to climb to an altitude of about 500 feet AMSL. Immediately after raising the undercarriage, the nr.1 (left hand) engine spooled down from 100% to zero within seven seconds. The aircraft then descended and the stick shaker activated. The airplane force landed in a small field and skidded before coming to rest with the fuselage broken in two and detached from the wings.
The Probable Cause was determined as follows:
Engine failure after takeoff followed by inappropriate crew response, resulting in the loss of both lateral and directional control, the misidentification of the failed engine, and subsequent shutdown of the remaining serviceable engine.
- Separation of the second-stage turbine seal plate rim;
- Failure of the captain and first officer to implement any crew resource management procedures as prescribed in the operator’s training manual;
- The crew’s failure to follow the correct after take-off engine failure procedures as prescribed in the aircraft’s flight manual.
May 11, 2010
The Embraer 135 came to rest across a road
The runway excursion accident involving an Airlink (South Africa) Embraer RJ135LR passenger jet in Decemer 2009 was caused by aquaplaning due to poor runway friction, according to the second interim report published by the South African Civil Aviation Authority (CAA).
SA Airlink flight SA 8625 departed Cape Town International Airport (CPT) on a domestic scheduled flight to George Airport (GRJ). The aircraft was cleared for an instrument landing system (ILS) approach runway 11. The prevailing weather conditions at the time were overcast in light rain. The aircraft touched down in the area of the fourth landing marker. At the end of the runway veered to the right and went past the ILS localizer. The aircraft collided with eleven approach lights before it burst through the aerodrome perimeter fence, with the aircraft coming to rest in a nose down attitude on a public road.
Runway 11 is a 2000 x 45 meters asphalt runway. At the time of this accident it was the first time that the George area had received a proper rain shower following the rehabilitation of the runway, which was concluded on 6 November 2009. It would appear that the application of the fog spray sealant extensively used during the runway rehabilitation works degraded the surface friction coefficient of the runway surface during wet conditions. This allowed the onset of aquaplaning and thereby inhibited the application of adequate braking pressure by the anti-skid system to stop the aircraft within the certificated distance.