11-05-2018, 10:18 AM | #23 |
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Going full lock at an angle????
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11-05-2018, 10:27 AM | #24 |
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11-05-2018, 10:28 AM | #25 |
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The problem is that this airline is too big to fail and an event like this likely won't put a damper on anything or make them any safer.
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11-05-2018, 11:10 AM | #26 | |
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That's like walking up to your BMW, seeing a puddle of coolant on the ground and deciding to drive it anyway.
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11-05-2018, 11:35 AM | #27 | |
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If you want to read about the investigation: https://en.m.wikipedia.org/wiki/Boei..._rudder_issues
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11-05-2018, 12:38 PM | #28 | |
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This issue possibly led to 2 crashes (theorized - not proven) but I've not seen any reference to this occurring to an aircraft with the updated pieces. Got any current info? |
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11-05-2018, 01:22 PM | #29 |
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I admit to being mislead and not informed about the subject. Thank you for spreading light on the matter.
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11-05-2018, 01:38 PM | #30 | |
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11-06-2018, 11:02 PM | #31 |
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Boeing issuing Alert S.B. and FAA issuing Emergency AD regarding erroneous Alpha Vane (AoA Probe) signals causing sudden pitch over and limited elevator control authority.
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11-07-2018, 12:23 AM | #32 |
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Maybe bad tubes that indicated incorrect air speed? Plane was probably not under manual control at the time. This causes bad things to happen when automation relies on correct air speed. If you're not trained properly you won't notice until bad things start to happen and then it will be too late.
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11-07-2018, 02:54 AM | #33 | |
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stripping of the threads. And this wasnt the rudder but the vertical stabilizers.
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11-07-2018, 09:47 AM | #34 | |
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The Boeing Company Flight Crew Operations Manual Bulletin Number: TBC-19 Issue Date: November 6, 2018 Airplane Effectivity: 737-8 / -9 Subject: Uncommanded Nose Down Stabilizer Trim Due to Erroneous Angle of Attack (AOA) During Manual Flight Only Reason: To Emphasize the Procedures Provided in the Runaway Stabilizer Non-Normal Checklist (NNC). The Indonesian National Transportation Safety Committee has indicated that Lion Air flight 610 experienced erroneous AOA data. Boeing would like to call attention to an AOA failure condition that can occur during manual flight only. This bulletin directs flight crews to existing procedures to address this condition. In the event of erroneous AOA data, the pitch trim system can trim the stabilizer nose down in increments lasting up to 10 seconds. The nose down stabilizer trim movement can be stopped and reversed with the use of the electric stabilizer trim switches but may restart 5 seconds after the electric stabilizer trim switches are released. Repetitive cycles of uncommanded nose down stabilizer continue to occur unless the stabilizer trim system is deactivated through use of both STAB TRIM CUTOUT switches in accordance with the existing procedures in the Runaway Stabilizer NNC. It is possible for the stabilizer to reach the nose down limit unless the system inputs are counteracted completely by pilot trim inputs and both STAB TRIM CUTOUT switches are moved to CUTOUT. Additionally, pilots are reminded that an erroneous AOA can cause some or all of the following indications and effects: - Continuous or intermittent stick shaker on the affected side only. - Minimum speed bar (red and black) on the affected side only. - Increasing nose down control forces. - Inability to engage autopilot. - Automatic disengagement of autopilot. - [COLOR="DarkRed"]IAS DISAGREE alert[/COLOR]. - [COLOR="DarkRed"]ALT DISAGREE alert[/COLOR]. - AOA DISAGREE alert (if the AOA indicator option is installed) - [COLOR="DarkRed"]FEEL DIFF PRESS light[/COLOR]. In the event an uncommanded nose down stabilizer trim is experienced on the 737-8 /-9, in conjunction with one or more of the above indications or effects, do the Runaway Stabilizer NNC ensuring that the STAB TRIM CUTOUT switches are set to CUTOUT [COLOR="DarkRed"]and stay in the CUTOUT position for the remainder of the flight.[/COLOR] |
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11-07-2018, 02:43 PM | #35 |
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This sounds like a reason to ground the affected fleet immediately, if this happens direct after T/O, lets say below of 5000ft you have less that few seconds to respond. How often was this reported actually and how to fix that issue?
At my next scheduled simulator session I'll try to head to the 737-colleages and ask how about a simulation of this.
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11-07-2018, 02:46 PM | #36 | |
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11-07-2018, 03:22 PM | #37 | |
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It’s possible the pilots in this instance were more fixated on the instrumentation errors and didn’t notice the aircraft rapidly trimming the nose down.
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11-08-2018, 08:51 AM | #38 |
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Lion Air: Sensor was replaced day before crash but problems persisted https://www.cnn.com/2018/11/08/asia/...ntl/index.html
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