Superjet overrun probe suspects misleading friction data
Russian investigators probing a gear-collapse and overrun by a Sukhoi Superjet 100 have determined that the friction coefficient of the Yakutsk runway was far lower than the figure given to the crew. The Yakutia aircraft had been operating the flight, from Ulan-Ude Oct 10, with its right-hand thrust-reverser deactivated. While this deactivation was permitted as a deferred item, it meant that the criteria for landing included a runway friction coefficient no lower than 0.4. The Superjet crew was told that the coefficient for runway 23L was 0.45, according to federal air transport regulator Rosaviatsia’s preliminary findings. But an assessment of the runway surface revealed the presence of ice, and friction measurements for the various sections of the runway turned up values of 0.25-0.32. <br/>
https://portal.staralliance.com/cms/news/hot-topics/2018-10-12/unaligned/superjet-overrun-probe-suspects-misleading-friction-data
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Superjet overrun probe suspects misleading friction data
Russian investigators probing a gear-collapse and overrun by a Sukhoi Superjet 100 have determined that the friction coefficient of the Yakutsk runway was far lower than the figure given to the crew. The Yakutia aircraft had been operating the flight, from Ulan-Ude Oct 10, with its right-hand thrust-reverser deactivated. While this deactivation was permitted as a deferred item, it meant that the criteria for landing included a runway friction coefficient no lower than 0.4. The Superjet crew was told that the coefficient for runway 23L was 0.45, according to federal air transport regulator Rosaviatsia’s preliminary findings. But an assessment of the runway surface revealed the presence of ice, and friction measurements for the various sections of the runway turned up values of 0.25-0.32. <br/>
