Pilots flying the same plane on its penultimate flight a day earlier had experienced a similar problem, en route from Denpasar, Bali to Jakarta. The airplane’s anti-stall system repeatedly pushed the nose down, which is how pilots usually get air under the wings.īut the system experienced an over-reaction known as a runaway, prompting an eight-minute battle between the captain pulling the nose back up and computers holding it down. That angle is a key flight parameter that must remain narrow enough to preserve lift and avoid an aerodynamic stall. The brand-new airplane had suffered a sequence of problems in cockpit readings since Oct 26, culminating in a decision to change a key sensor known as the angle-of-attack probe before the penultimate flight from Denpasar to Jakarta.ĭuring the fatal night-time flight, a “stick shaker” was vibrating the captain’s controls, warning of a stall throughout most of the 13 minutes aloft based on what investigators believe to have been erroneous data on its angle to the oncoming air. “At this stage I do not have the answer,” KNKT investigator Nurcahyo Utomo told reporters.Ĭontact with the Boeing 737 MAX jet was lost 13 minutes after it took off on Oct 29 from the capital, Jakarta, heading north to the tin-mining town of Pangkal Pinang. Indonesia’s transport safety committee (KNKT) focused on airline maintenance and training and the response of a Boeing anti-stall system to a recently replaced sensor but did not give a cause for the crash that killed all 189 people on board. REUTERS/Darren WhitesideĪ preliminary report unveiled fresh details of efforts by pilots to steady the jet as they reported a “flight control problem”, including the captain’s last words to air traffic control asking to be cleared to “five thou” or 5,000 feet. Indonesia’s National Transportation Safety Committee (KNKT) sub-committee head for air accidents, Nurcahyo Utomo, holds a model airplane while speaking next to deputy chief of KNKT Haryo Satmiko during a news conference on its investigation into a Lion Air plane crash last month, in Jakarta, Indonesia November 28, 2018.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |