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Ethiopian 737 MAX 8 crash

Old 04-13-2019, 09:01 AM
  #581  
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Originally Posted by 60Pascal View Post
I was referring to the data from the ET302 accident report. However it's clear now: the air data computer corrects the static and pitot pressure for AoA, and since the AoA was incorrect, the airspeed and altitude were wrong too.

There's an article in AvWeek today by Fred George, where he explains it like this: "AOA is used by the aircraft’s air data computers to correct pitot and static pressure variations induced by changes in nose attitude in relation to the relative wind. Large errors in AOA can cause 20-40-kt. errors in IAS and 200-400-ft. errors in indicated altitude."
In the mishap airplane, yes. You appeared to be referring to aircraft in general.

In the Ethiopian mishap, yes, there was an airspeed difference, caused by incorrect AoA data. It was on the left side only, and the crew determined that to be the case. The crew verbalized the problem with the left AoA, and knew they had an airspeed difference.

The failed AoA input did not affect the left side or the standby instrumentation. It's for that reason that the standby indication is uncompensated and is independent.
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Old 04-13-2019, 01:24 PM
  #582  
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J Burke, your signature line haha. You'll like this:

Instagram star is filmed sobbing over the prospect of a 9-5 job and insists she 'isn't cut out for work' – after her account boasting 113,000 followers was deleted for being spam

https://www.dailymail.co.uk/femail/a...m-deleted.html
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Old 04-16-2019, 10:59 AM
  #583  
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Can someone help me understand as to why turning off the MCAS cannot solve the issue? Like why couldn’t control be regained of the plane once off
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Old 04-16-2019, 11:11 AM
  #584  
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MCAS can not be turned off. The electronic stabilizer trim can be turned off rendering MCAS useless. The preliminary report shows MCAS commanding nose down trim even after the switches were off but the trim did not move. The reason they could not control the aircraft at that point was because they were above the maximum operating speed for the aircraft and manual trim is nearly impossible to use with those aerodynamic loads.


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Old 04-16-2019, 09:27 PM
  #585  
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Originally Posted by Firefighter View Post
Can someone help me understand as to why turning off the MCAS cannot solve the issue? Like why couldn’t control be regained of the plane once off
MCAS is a media circus; it may be the least important player here. Don't believe what you see on the "news."
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Old 04-28-2019, 07:33 AM
  #586  
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Thank you to all those that have contributed to this thread. I think the following article may be a little optimistic but sounds like things are happening.

The FAA has called a crucial meeting of the heads of civil-aviation authorities from around the world for May 23, where the U.S. regulatory agency is expected to outline its finalized safety analysis in an attempt to foster international consensus.


https://www.seattletimes.com/busines...or-early-june/
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Old 04-28-2019, 02:12 PM
  #587  
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"Boeing Whistleblowers Report More 737 MAX 8 Problems to FAA"

https://interestingengineering.com/b...roblems-to-faa
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Old 04-28-2019, 03:33 PM
  #588  
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Originally Posted by atpcliff View Post
"Boeing Whistleblowers Report More 737 MAX 8 Problems to FAA"

https://interestingengineering.com/b...roblems-to-faa
I’m stunned that nobody seems interested in how many AOA indicators are failing. It grounded the Cirrus Jet fleet. Unrelated but the failing AOA indicators on the max are troublesome.
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Old 05-03-2019, 04:21 PM
  #589  
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Originally Posted by pangolin View Post
I’m stunned that nobody seems interested in how many AOA indicators are failing. It grounded the Cirrus Jet fleet. Unrelated but the failing AOA indicators on the max are troublesome.
I thought it was very odd that two new airplanes had already experienced AOA failures. In my 25+ years of flying I've never experienced one nor heard a friend having one.
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Old 05-03-2019, 04:38 PM
  #590  
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Originally Posted by PurpleToolBox View Post
I thought it was very odd that two new airplanes had already experienced AOA failures. In my 25+ years of flying I've never experienced one nor heard a friend having one.
In my 5 years, I've experienced 2. I guess it's just random.
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