En tournant autour du sujet de la petite sortie de piste d'un A 350 à Phuket, je suis tombé sur cet accident connu survenu au même endroit avec un MD 82, 16 sept 2007 : météo exécrable et gradient de vent, remise de gaz avec prise d'assiette correcte mais pas d'action sur les TOGA switch, les moteurs restent sur ralenti pendant 13 secondes (étaient sur ralenti suite au gradient de vent), la vitesse est faible pendant que l'avion remonte mais sans poussée, la poussée de remise de gaz est enfin affichée, mais l'avion retombe au sol. Lourds dégâts humains.
La comparaison avec EK 521 se limite à l'absence de poussée en remise de gaz, car la météo n'est pas comparable. Au passage cet équipage volait depuis un moment en ayant emplafonné les limites de temps de vol, 106 h et 120 h dans les 30 derniers jours..)
Citation:
At 15:39:47, the crew received a "sink rate" warning, and at 15:39:48, as the airplane descended below 50 feet, the autothrottle system initiated an automatic reduction of all engine thrust. The engine EPR decreased from 2.0 (‘go around thrust’) at 15:39:48 to about 1.14 (‘idle thrust’) at 15:39:53.
At 15:39:49, the first officer called for a go-around, and the pitch of the airplane increased from about 2 degrees to about 12 degrees, as the airplane climbed. The thrust continued to decrease towards its ‘idle’ position, while the airspeed decreased from 165 KCAS to about 122 KCAS at 15:39:57.
At 15:39:50, the first officer transferred aircraft control to the captain as the thrust was reaching idle EPR. The EPR remained at the ‘idle’ level for about 13 seconds, as the airplane continued to climb to a maximum altitude of 262 feet at 15:40:01, and then started descend again. During this time, the landing gear was retracted, and the flaps were set to 15 degrees; however, the takeoff/go-around (TO/GA) switch was never pressed.
The pitch angle decreased from 12 degrees to about 0 degrees, while the airspeed remained relatively constant at around 122 KCAS, with about +/- 4 knot excursions about this average.
At 15:40:06, a “don’t sink” warning sounded in the cockpit, as the airplane was descending through approximately 175 feet. The EPR began to increase again, reaching ‘go around thrust’ at 15:40:09; however, the altitude and pitch continued to decrease.
At 15:40:09, a “sink rate” warning, followed by a “pull up” warning sounded in the cockpit. During these warnings, the pitch began to increase from 0 degrees. The pitch increased to approximately 5 degrees over the next second, until the aircraft impacted the ground next to the runway at 15:40:11. The aircraft slid across a concrete ditch and burst into flames.
Citation ASN, site inaccessible.
Rapport complet :
http://www.skybrary.aero/bookshelf/books/1980.pdf