philidor
in service - 6 years
Posts: 8,950
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Post by philidor on Nov 8, 2018 17:04:56 GMT 1
Wow, that's some serious glitch. Reminds me of the Qantas A330 that did a random dive due to a faulty ADIRU but in this case it happened just at 5000 feet giving very little room to bring the flight back under control. The absence on the 737 of a computer-enforced flight enveloppe protection system might have aggravated the consequences of the glitch. Of course, we'll have to wait for the investigation report. |
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Post by stealthmanbob on Mar 20, 2019 14:09:08 GMT 1
Wow a jump seat pilot saved the Lion Air MAX the day before the crash 😮
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philidor
in service - 6 years
Posts: 8,950
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Post by philidor on Mar 21, 2019 17:00:32 GMT 1
Wow a jump seat pilot saved the Lion Air MAX the day before the crash The flying crew was probably overwhelmed by the fight to keep the aircraft aloft. The third pilot was probably tasked to go through the documentation and he came up with the way out of the situation. A large part of the MCAS problem may be the man-to-machine interface ... |
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Post by kevin5345179 on Apr 3, 2019 6:49:05 GMT 1
I don't see how anyone can still blame JT for their own record ...
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philidor
in service - 6 years
Posts: 8,950
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Post by philidor on Apr 3, 2019 10:56:15 GMT 1
I don't see how anyone can still blame JT for their own record ... Well, it remains to be seen whether the repaired sensor was properly installed. If pilots having problems with one engine happen to cut the working one instead of the defective one, then a mechanic having to change a sensor may change the working sensor, still leaving the aircraft with a defective one. Of course, nothing tells us that this was the case, or that a defective sensor caused the wrong indication. |
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mjoelnir
in service - 2 years
Posts: 4,089
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Post by mjoelnir on Apr 3, 2019 11:34:11 GMT 1
I don't see how anyone can still blame JT for their own record ... Well, it remains to be seen whether the repaired sensor was properly installed. If pilots having problems with one engine happen to cut the working one instead of the defective one, then a mechanic having to change a sensor may change the working sensor, still leaving the aircraft with a defective one. Of course, nothing tells us that this was the case, or that a defective sensor caused the wrong indication. Here the pilot has not the possibility to switch sensors, so the analogy is a bit flawed. I could believe the mechanics fault theory, pushed by ardent Boeing fans, if the Ethiopian crash had not happened, again with a faulty sensor. There are to many faulty sensors around. |
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philidor
in service - 6 years
Posts: 8,950
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Post by philidor on Apr 3, 2019 12:05:53 GMT 1
Here the pilot has not the possibility to switch sensors, so the analogy is a bit flawed. I could believe the mechanics fault theory, pushed by ardent Boeing fans, if the Ethiopian crash had not happened, again with a faulty sensor. There are to many faulty sensors around. I was answering Kevin's comment ("I don't see how anyone can still blame JT for their own record"). Even though the ET crash shows that maintenance wasn't the main factor in the previous crash, it's yet too early in my opinion to claim that it was not a factor at all in the Lion Air crash. I agree that there seem to be too many cases of wrong indication, but we still don't know whether or not sensor failures are a cause, let alone the sole one. There may be some software/electronic error between the sensor and the display - we cannot rule that out at this stage. |
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Post by kevin5345179 on Apr 3, 2019 20:38:23 GMT 1
Here the pilot has not the possibility to switch sensors, so the analogy is a bit flawed. I could believe the mechanics fault theory, pushed by ardent Boeing fans, if the Ethiopian crash had not happened, again with a faulty sensor. There are to many faulty sensors around. I was answering Kevin's comment ("I don't see how anyone can still blame JT for their own record"). Even though the ET crash shows that maintenance wasn't the main factor in the previous crash, it's yet too early in my opinion to claim that it was not a factor at all in the Lion Air crash. I agree that there seem to be too many cases of wrong indication, but we still don't know whether or not sensor failures are a cause, let alone the sole one. There may be some software/electronic error between the sensor and the display - we cannot rule that out at this stage. FDR data was released. AOA was showing pitch up (no polarity flipped) and FDR is recording it (system sees it). PLEASE, tell me what else can be wrong ...... |
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philidor
in service - 6 years
Posts: 8,950
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Post by philidor on Apr 4, 2019 9:19:12 GMT 1
FDR data was released. AOA was showing pitch up (no polarity flipped) and FDR is recording it (system sees it). PLEASE, tell me what else can be wrong ...... A faulty sensor is a likely cause for a wrong indication, but not the only possible one. There is an electronic connexion (through the so-called ADIRU - I don't know much about it) between the sensor, the computers and the display. If the sensor was changed (as reported), but the system was not working, whatever the reason, then wrong installation and/or insufficient testing may have been a factor - OR NOT. |
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sciing
in service - 1 year
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Post by sciing on Apr 4, 2019 13:31:21 GMT 1
FDR data was released. AOA was showing pitch up (no polarity flipped) and FDR is recording it (system sees it). PLEASE, tell me what else can be wrong ...... A faulty sensor is a likely cause for a wrong indication, but not the only possible one. There is an electronic connexion (through the so-called ADIRU - I don't know much about it) between the sensor, the computers and the display. If the sensor was changed (as reported), but the system was not working, whatever the reason, then wrong installation and/or insufficient testing may have been a factor - OR NOT. Maybe some background on what is already known. The AoA issue seems to be also kind of miracle. Both AoA and ADM were in the end checked before the critical flight tested and still failing. The change of the AoA was already done before the other flight, the famous where the crew had successfully done the autotrim cut out. Before the crash the ADM was checked. avherald.com/h?article=4bf90724/0009&opt=0 |
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