Search found 16 matches

by PStechPaul
Wed Aug 21, 2019 11:01 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 582023

Re: Boeing 737MAX Grounded Worldwide Q3 2019

nice try a plane with usual aerodynamical atitudes would not need a augmentation system all what we can suspect ( nobody knows without the boeing testpilots and some designers at boeing ) is that the flight atitudes of the MAX are on the knife's edge. you CAN correct that with an augmentation syste...

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by PStechPaul
Wed Aug 21, 2019 9:27 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 582023

Re: Boeing 737MAX Grounded Worldwide Q3 2019

The aerospace engineer's article was quite interesting and informative, perhaps especially for another engineer (I am an electronics engineer). His point about the publicly perceived instability of the MAX was especially enlightening. AIUI, a truly unstable aircraft would enter an area where the lig...

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by PStechPaul
Tue Aug 20, 2019 8:00 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 582023

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Thank you, Francoflier, for validating my observation that the pilots would likely not have identified the problem as runaway stab, because the yoke trim switches were responsive, and stopped the AND trim caused by MCAS. It could also have been caused by an autopilot malfunction, but AIUI disabling ...

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by PStechPaul
Tue Aug 20, 2019 2:42 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 582023

Re: Boeing 737MAX Grounded Worldwide Q3 2019

A true stab trim runaway condition would not be affected by manual (electric) trim adjustment.

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by PStechPaul
Mon Aug 19, 2019 8:52 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 582023

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Just a few quick questions/comments: 1. I have seen reference to a Boeing 738? Is that actually a 737-8? 2. For redundancy, would it be better (and easier/cheaper) to have a pilot-commanded switch-over from primary system to alternate system, to see if that corrected what seem to be erroneous readin...

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by PStechPaul
Sun Jul 07, 2019 7:54 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 582023

Re: Boeing 737MAX Grounded Worldwide Q3 2019

I thought I had read that the trim wheels for the 737MAX were smaller than for the NG, thus requiring greater force. But apparently that happened during the changes from the 737-200 Classic to the 737NG. It is not clear if the gearing of the manual actuators was changed to compensate, but in light o...

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by PStechPaul
Tue May 21, 2019 6:27 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 390537

Re: Boeing 737MAX Grounded Worldwide Q2 2019

It seems to me that it might be a good idea to implement a software solution for the abnormal conditions checklist, where the flight computer could present the appropriate checklist items on-screen, or perhaps on a connected tablet, rather than (or in addition to) printed paper. The pilots could als...

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by PStechPaul
Fri May 03, 2019 12:02 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 390537

Re: Boeing 737MAX Grounded Worldwide Q2 2019

As for blaming the pilots for keeping thrust at 94% and overspeeding, wasn't auto-throttle engaged? And shouldn't that be configured to reduce thrust when maximum speed is reached?

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by PStechPaul
Thu May 02, 2019 6:39 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 390537

Re: Boeing 737MAX Grounded Worldwide Q2 2019

As I understand it, the ET304 aircraft had auto-throttle engaged during the emergency. But wouldn't auto-throttle reduce thrust when maximum airspeed was reached? That seems like a reasonable and logical safeguard, but then the MCAS implementation was also flawed and dangerous.

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by PStechPaul
Fri Apr 19, 2019 11:14 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 721495

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Very funny. But the recent 737MAX crashes have highlighted the potential severity of damaged AoA sensors: https://canadianbirdstrike.ca/boeings-crashes-expose-reliance-on-sensors-vulnerable-to-damage/ And my suggestion of bird strike sensors and outside cameras has been proposed elsewhere: https://w...

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by PStechPaul
Fri Apr 19, 2019 9:21 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 721495

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Since the AoA sensors are so important, and also vulnerable to bird strike, why not... 1. Add a means (camera?) for visual inspection of the vanes (and other external surfaces) by the pilots 2. Add FOD sensors (microphones?) to determine if there has been a bird strike or similar occurrence 3. Insta...

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by PStechPaul
Mon Apr 15, 2019 7:26 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 721495

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

It seems that there have been many more anomalies and failures involving left side instrumentation, than those on the right side. It might prove useful to research the maintenance logs as well as FDRs to explore the possibility of a meaningful correlation. There was some question about the mounting ...

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by PStechPaul
Sat Apr 13, 2019 6:51 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 721495

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Maybe a crazy idea, but would it be possible to rotate (roll) the plane such that it was flying upside down, which would allow it to gain altitude rather than dive? It probably would not have been able to save this plane, at least when it was in its final dive at low altitude, but wouldn't it invert...

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by PStechPaul
Fri Mar 22, 2019 7:20 pm
Forum: Technical/Operations
Topic: MAX nacelle, AOA, center of lift, and C/G
Replies: 193
Views: 14437

Re: MAX nacelle, AOA, center of lift, and C/G

Perhaps it would be more cost effective, and safer, for Boeing to revise their present manufacturing of the 737-MAX to the NG by using the original smaller engines, and keeping the larger ones for a new clean-sheet design. The existing MAX versions should be able to be retrofitted with the smaller e...

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by PStechPaul
Fri Mar 22, 2019 5:44 am
Forum: Civil Aviation
Topic: Potential of future Quad Engine passenger planes
Replies: 59
Views: 6357

Re: Potential of future Quad Engine passenger planes

In light of the recent Ethiopian Airlines and Lion Air 737-MAX tragedies, perhaps caused to some extent by the quest for greater efficiency and reduced cost, I was wondering if electric or hybrid aircraft might be a viable alternative. The technology is probably not quite there, yet, but future deve...

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by PStechPaul
Fri Mar 22, 2019 4:48 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 721495

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

I've been following most of this thread and the last few pages of the Lion Air thread, with great interest. So I decided to join in order to reply, but I had problems registering and logging on. Now that seems to be resolved but I can't submit an Avatar or other profile data, and the "contact u...

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