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Article is behind a paywall unfortunately. Any help? :)
by virtuexru 7y ago
Article is behind a paywall unfortunately. Any help? :)
- bxio 7y agoRegistration wall and the ol' HN Hug of Death, not a good combination.
- jfk13 7y agoAFAICS it's a registration-wall, not actually a pay-wall.
- newnewpdro 7y agoIsn't this just splitting hairs over which currency is paid?
- amluto 7y agoThis might be the same article: https://theworldnews.net/us-news/ethiopian-max-crash-simulator-scenario-stuns-pilots https://theworldnews.net/us-news/ethiopian-max-crash-simulat... The original link seems dead. edit: nope, my link is no good either.
- simcop2387 7y agoFound a forum thread about it from some aviation enthusiasts [1]. Some choice excerpts they made: ‘A simulator session flown by a U.S.-based Boeing 737 MAX crew that mimicked a key portion of the Flight 302 accident sequence suggests that the crew faced a near-impossible task of getting their 737 MAX back under control, and underscores the importance of pilots understanding severe runaway trim recovery procedures.’ ‘What the U.S. crew found -. Keeping the aircraft level required significant aft-column pressure by the captain, and aerodynamic forces prevented the first officer from moving the trim wheel a full turn. They resorted to a little-known procedure to regain control.’ (YoYo Roller Coaster) The excessive descent rates during the first two steps meant the crew got as low as 2,000 ft. during the recovery. ... ‘The simulator session underscored the importance of reacting quickly to uncommanded stabilizer movements and avoiding a severe out-of-trim condition, one of the pilots involved said. “I donʼt think the situation would be survivable at 350 kt. and below 5,000 ft,” this pilot noted.’ “This is the sort of simulator experience airline crews need to gain an understanding of how runaway trim can make the aircraft very difficult to control, and how important it is to rehearse use of manual trim inputs,” [1] https://www.pprune.org/rumours-news/621478-ethiopian-max-crash-simulator-scenario-stuns-pilots.html https://www.pprune.org/rumours-news/621478-ethiopian-max-cra...
- debt 7y agoCan someone shed light on what the "little-known procedure" is they're referring to?
- theclaw 7y agoIt's a "roller coaster" procedure where the plane is pitched down to lessen aerodynamic forces on the stabiliser, allowing the trim wheels to be manually turned, then pitched up to regain altitude. The process is repeated as necessary until the trim wheels can be manually moved without it.
- AYBABTME 7y agoInteresting, it seems similar to how large sailboats need to head into or down wind when attempting to trim sails in some conditions? (to reduce pressure on the sails to allow trimming to be doable by hand)
- Zeebrommer 7y agoYeah, with the important difference that in sailing you lose speed (and heel) when heading into the wind, whereas a plane will go even faster towards the ground... Scary!
- janoc 7y agoYes. Mentour mentions it in the video I have posted above. You unload the stabilizer by pitching down for a few seconds so that you can trim it back somewhat. However, that is not something you can do close to the ground (you lose altitude, obviously) and the "vomit comet" ride won't be appreciated by the passengers neither.
- 112012123 7y agoMost likely aerodynamically relieving trim wheel pressure by intentionally letting the nose of the plane drift down. This allows the pilots to more easily crank the trim wheel and fix the issue. If I remember correctly, this procedure was specifically described in older 737 manuals, but had been dropped more recently.
- blotter_paper 7y agoNot technically a paywall, I think access is free if you give them an email address to spam. email: DumbFace81924@mailinator.com password: bugmenot source: http://bugmenot.com/view/aviationweek.com http://bugmenot.com/view/aviationweek.com