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Post by kevin5345179 on Mar 30, 2019 3:59:51 GMT 1
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Post by airboche on Mar 30, 2019 22:23:00 GMT 1
No surprise it seems that those two nose mounted sensors were torn off or similar. Whether they worked or not should have been recorded and documented by the FDR shouldn't it?
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Post by stealthmanbob on Mar 30, 2019 23:42:25 GMT 1
No surprise it seems that those two nose mounted sensors were torn off or similar. Whether they worked or not should have been recorded and documented by the FDR shouldn't it? All the report said was they had not found one of the AOA sensors, they are looking for it in a crash scene ! The previous tweet is crap, as previously stated the AOA sensor that the MCAS system uses switches from left to right after each flight, it does not matter which side AOA sensor it is the stick shaker activates both control columns !
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philidor
in service - 6 years
Posts: 8,950
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Post by philidor on Mar 31, 2019 11:02:05 GMT 1
Whether they worked or not should have been recorded and documented by the FDR shouldn't it? Not necessarily so, in my opinion. The FDR will show that erroneous data were sent and displayed, but that alone doesn't allow investigators to conclude that the sensor was faulty, as the fault might come from the ADIRU. The question has serious implications since in the Lion Air catastrophe the sensor was changed by maintenance before the flight. If data from the FDR were enough to provide an answer, I think we would already have heard of it. IF the ADIRU was faulty (admittedly a big IF), Boeing might have more fixes to design and implement than they announced.
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mjoelnir
in service - 2 years
Posts: 4,089
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Post by mjoelnir on Mar 31, 2019 14:34:46 GMT 1
Whether they worked or not should have been recorded and documented by the FDR shouldn't it? Not necessarily so, in my opinion. The FDR will show that erroneous data were sent and displayed, but that alone doesn't allow investigators to conclude that the sensor was faulty, as the fault might come from the ADIRU. The question has serious implications since the sensor was changed by maintenance before the flight. If data from the FDR were enough to provide an answer, I think we would already have heard of it. IF the ADIRU was faulty (admittedly a big IF), Boeing might have more fixes to design and implement than they announced. The sensor was changed on the Lion Air frame, but not AFAIK on the Ethiopian. It matters to know, why this sensor, or downstream electronics has this high failure rate.
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Post by stealthmanbob on Mar 31, 2019 14:53:34 GMT 1
The sensor was changed on the Lion Air frame, but not AFAIK on the Ethiopian. It matters to know, why this sensor, or downstream electronics has this high failure rate. With the Lion Air incident there is quite a possibility that they changed the wrong AOA sensor prior to the fateful final flight, leaving the broken one on and replacing the working one with a new one !
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Post by kevin5345179 on Apr 1, 2019 2:35:05 GMT 1
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philidor
in service - 6 years
Posts: 8,950
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Post by philidor on Apr 1, 2019 9:29:47 GMT 1
The sensor was changed on the Lion Air frame, but not AFAIK on the Ethiopian. You are right, it's what I meant. I clarified my post.
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Post by fanairbus on Apr 2, 2019 8:07:45 GMT 1
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philidor
in service - 6 years
Posts: 8,950
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Post by philidor on Apr 2, 2019 10:36:13 GMT 1
An interesting quote from the above Flightglobal article : "The FAA expects to receive Boeing's final package of its software enhancement in the coming weeks for FAA approval", the agency says in a 1 April statement. "Time is needed for additional work by Boeing as the result of an ongoing review of the 737 Max flight control system, to ensure that Boeing has identified and appropriately addressed all pertinent issues"
We can infer that the first package did not appropriately address all pertinent issues.
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