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On Jan 24th 2013 Russia's MAK reported that the captain was pilot flying during the landing on Vnukovo's runway 19. The computed Vref was 108 knots, the Vapp taking winds into account was set at 118 knots for flaps at 37 degrees and slats at 23 degrees and a landing weight of 67.5 tons. The aircraft was correctly configured, the center of gravity was at 26.5% MAC within limits.
On final approach the aircraft was flown manually without autopilot and autothrust, the flight director however was used, the aircraft proceeded on final approach without any significant deviations. The aircraft crossed the runway threshold at 50 feet (15 meters) at 134 KIAS, after descending through 12 feet the aircraft took 10 seconds to touchdown, the thrust levers were moved to idle about 5 seconds prior to touchdown, which occurred at 118 KIAS about 900 meters down the runway (3060 meters length) with the left main gear signalling compressed.
A gust of 22 knots from the right arrived at that time, the vertical acceleration reached +1.12G. 3 seconds after the left main gear signalled compressed the nose gear was lowered onto the runway, the right main gear still signalled not compressed. Almost simultaneously with lowering the nose gear the thrustlevers were moved to maximum reverse thrust in one move and the brakes were applied. Both thrust reversers did not deploy, both engines however spooled up to about 90% N1 delivering nominell thrust, however forward instead of backward. Neither spoilers nor air brakes automatically deployed, too, the crew did not deploy spoilers manually. Maximum brakes pressure was recorded for the left hand brakes with no pressure in the right hand brakes.
About 2 seconds after the thrust levers had been placed at maximum reverse thrust the flight engineer called the thrust reversers had not deployed. About 7-8 seconds after touchdown the aircraft reached a minimum speed of about 104 knots, the thrust levers were taken out of reverse after being in reverse for 8 seconds, the airspeed had increased to 123 KIAS at that time causing further "unloading of the gear", the aircraft began to oscillate in roll from about 4.5 degrees left to about 2.6 degrees right causing that at no time both main landing gear legs were compressed simultaneously. Brakes were ineffective as brakes pressure was only applied with the gear leg reporting compressed. 5 seconds after the levers were moved out of reverse they were moved again into reverse, again neither thrust reverser deployed and the engines accelerated to 84% N1, about 4 seconds later the levers were moved out of reverse again, the aircraft was now about 950-1000 meters short of the runway end.
The crew now attempted automated brakes, the thrust levers were placed at minimum reverse thrust. 32 seconds after touchdown the aircraft went past the end of the runway at a speed of 111 KIAS, the flight engineer shut down both engines by the emergency handle. Following the exit onto soft ground both main gear legs signalled compressed, the spoilers, air brakes and thrust reversers deployed, the aircraft however impacted the slope of the ravine at a speed of 98 knots.
L'équipage n'a pas été aidé, c'est le moins qu'on puisse dire, par la sécurité qui refuse de déployer les reverses tout en acceptant de monter le N1...
Regrettable qu'il n'y ait pas eu de déploiement manuel des spoilers, au profit d'une apparente concentration (tunnelisation) sur le problème des reverses.
Mais je vois tout a fait ce que tu veux dire, depuis qu'on est passé au high bypass et aux normes de bruits restrictives, on incite a se servir beaucoup moins des reverses.
