Incident Overview
On May 11, 2009, at 18:37 UTC, a British Airways Boeing 747 powered by Rolls-Royce RB211-524H2-T engines was conducting a takeoff from Tambo International Airport (FAJS, formerly Johannesburg International Airport). During the takeoff roll, at a speed of 124 knots, the No. 3 engine thrust reverser unlock light illuminated. At 163 knots, the No. 2 engine thrust reverser unlock light also came on. Just prior to rotation, the aircraft's slats retracted.
Flight Operations
The aircraft rotated and climbed at a rate of 200 feet per minute. The flight crew subsequently dumped fuel and performed an air turn back to FAJS. A safe and uneventful landing was made.
Investigation
The investigation is under the jurisdiction of the government of South Africa. Further information pertaining to this incident may be obtained from the South African Civil Aviation Authority.