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  #11  
Antiguo 13-feb-2018, 13:47
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Fecha de Ingreso: abril-2012
Ubicación: MTH
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http://avherald.com/h?article=4b4cb236&opt=0
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  #12  
Antiguo 13-feb-2018, 20:49
Avatar de Phillip J fry
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Fecha de Ingreso: abril-2004
Ubicación: IN DA AIR
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In the afternoon of Feb 13th 2018 the MAK reported, that decoding of the FDR data has been completed. Preliminary analysis shows, that the pitot heatings for all three pitot probes were off while the pitot heatings had been turned on prior to departure on the previous 15 flights. About 2:30 minutes after becoming airborne a special situation developed at about 1300 meters of height and a speed of 465-470 kph (250 KIAS) when a disagreement between the speed readings #1 and #3 developed with the speed reading #2 not registering, #1 was showing about 30kph (15 knots) more than #3, an according message was issued. No significant altitude deviations between the pitot systems were noticed. At about 2000 meters height speed reading #1 began to reduce while #3 increased, another speed disagree message was issued. The crew disconnected the autopilot and continued in manual control. Speed readings from #3 reached 540-560 kph (290-300 KIAS), #1 speed readings continued to decrease. 50 seconds after the autopilot was disconnected the aircraft experienced vertical loads between 0.5 and 1.5G, the #1 speed reading reached 0, the #3 began to decrease reaching 200 kph (108 KIAS), the aircraft pitched down to about 30-35 degrees below horizont, the vertical load was 0G. Before collision with the ground #3 speed readings began to rapidly increase reaching 800 kph (432 KIAS) just before impact, #1 speed readings remained at 0. The pitch angle remained at 30 degrees below horizont until impact, 5 seconds prior to impact a right bank of 25 degrees developed. The MAK wrote: "A preliminary analysis of the recorded information, as well as an analysis of similar cases that occurred in the past, suggest that the development of a special situation in the flight could be caused by incorrect data on the flight speed on the pilots indicators, which in turn was apparently due to icing of the pitot probes when the heating systems are off."

http://www.avherald.com/h?article=4b4cb236&opt=0

Rob
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