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Strategies & Market Trends : 2026 TeoTwawKi ... 2032 Darkest Interregnum -- Ignore unavailable to you. Want to Upgrade?

To: abuelita who wrote (147048)	3/15/2019 1:40:23 PM
From: Elroy Jetson	1 Recommendation Recommended By elmatador Read Replies (1) \| Respond to of 219778

Boeing's proximate design flaw is the use of a single angle-of-attack sensor rather than three, but taller landing gear would restore stability by moving the engines back to a stable position. - theaircurrent.com The Air France Airbus A-330 has three, along with three airspeed indicators which dumped the pilots out of autopilot when they didn't agree and rebooted the flight control computers. The pilots on deck couldn't figure out what was really happening until the senior pilot joined them from the sleeping quarters. Pilots like the fact Boeing has not implemented Airbus's degree of fly-by-wire but Boeing decided the tendency toward upward pitch, from relocating the position of the larger engines up and forward, required giving the Auto-trim system it's own MCAS mini-auto-pilot MCAS (Maneuvering Characteristics Augmentation System) which is engaged only when the auto-pilot is off. This system should have been couple with triple sensors rather than one. MCAS doesn't activate until after the flaps are retracted after take-off, and only when auto-pilot is off, so just as they've completed take-off and prior to engaging the auto-pilot. Unlike the TigerAir pilots, the Ethiopian pilots had already been trained in turning off the auto-trim in the event of a AOA sensor failure, and we'll find out if they did that. As with Air France 447, three sensors lets you know there's a problem but doesn't solve the problem for the pilot. We don't know that the sensor failed, they both may have temporarily pitched too high. Eliminating the need for MCAS on the 737 max would require taller landing gear and placing the engine back and lower where it would normally be - a major redesign and added weight - and I think that's going to kill off sales of the Max line. Disengage the auto-trim on the upper right - but did they? MCAS

To: abuelita who wrote (147048)	3/15/2019 2:22:50 PM
From: Elroy Jetson	2 Recommendations Recommended By elmatador Maurice Winn Read Replies (2) \| Respond to of 219778

The Airbus A-380 has a natural pitch-down which needs to be corrected by the fly-by-wire system. It's the opposite of the natural pitch-up in the 737 Max series. This is a result of redistributing the weight so the horizontal stabilizers of the tail are used for lift, in addition to the wing. This design in the A-380 greatly reduces fuel usage, but it comes at the expense of creating an inherently unstable flight characteristic. It's an instability which should have naturally corrected the error of the Air France 447 stall, but the pilots action interfered the natural correction because they thought something else was happening. (loss of situational awareness)