Search found 356 matches

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by MrBretz
Thu Aug 22, 2019 12:08 am
Forum: Civil Aviation
Topic: LGB files criminal charges against Mesa Airlines for noise violations
Replies: 130
Views: 10979

Re: LGB files criminal charges against Mesa Airlines for noise violations

Here's a article that's about 2 years old. According to it, people are angry because the late night curfew is being broken regularly. Apparently, that's a rather new occurrence. It says Jet Blue doesn't mind. They just pay the fines. I also learned that LGB does not have a hard curfew like SNA. http...

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by MrBretz
Wed Aug 21, 2019 11:30 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

asdf said "if they really unground the MAX only with some minor software changes ...... statistics says that we will see the next crash within 18 month ..." You can make any statement you want but you don't offer an iota of statistical(it is mathematical, you know) proof. Why not say 18 ho...

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by MrBretz
Wed Aug 21, 2019 6:12 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

I have a question. When Boeing submits their fix to the FAA, do they supply a description of the changes AND all the test cases they have run to date showing the fixes works. I presume test cases would show results of simulated and real MAXs reacting to events similar to things that caused both cras...

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by MrBretz
Tue Aug 20, 2019 9:07 pm
Forum: Civil Aviation
Topic: LGB files criminal charges against Mesa Airlines for noise violations
Replies: 130
Views: 10979

Re: LGB files criminal charges against Mesa Airlines for noise violations

I love everyone on here complaining that there is enforcement of rules for parties to a contract that was signed, and you get people screaming “not fair!!” as if there is somehow a clause in the contract for fairness- what you say, there is a grace period for unforseen events such as weather or ite...

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by MrBretz
Tue Aug 20, 2019 8:50 pm
Forum: Civil Aviation
Topic: LGB files criminal charges against Mesa Airlines for noise violations
Replies: 130
Views: 10979

Re: LGB files criminal charges against Mesa Airlines for noise violations

JetBlue is by far the largest carrier at LGB. I noticed they have cut service close to 35% in the last year. If they leave, the airport will be like MRY or Tahoe. All the others have a small fraction of the takeoffs and landings. You can view the monthly traffic on the airport’s website.

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by MrBretz
Tue Aug 20, 2019 8:23 pm
Forum: Civil Aviation
Topic: LGB files criminal charges against Mesa Airlines for noise violations
Replies: 130
Views: 10979

Re: LGB files criminal charges against Mesa Airlines for noise violations

LGB is soon going to find itself in the position that MRY is in. Monterey had hissie fits about jet noise to the point that the major Jet operators quit flying there altogether! They didn't want corporate jets they didn't wat commercial jets. Well? What in hell Do they want? I'll tell you, NOTHING!...

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by MrBretz
Tue Aug 20, 2019 7:34 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Boeing looking to hire ‘several hundred’ aircraft mechanics, maintenance specialists So, does this mean they are getting ready for deliveries, or they are getting ready for winter storage? https://www.columbiabasinherald.com/front_page_slider/20190820/boeing_looking_to_hire_several_hundred_aircraft...

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by MrBretz
Sun Aug 18, 2019 2:12 am
Forum: Civil Aviation
Topic: DOT Rules Airlines Can’t Ban Pit Bulls and Other Service Animal Breeds
Replies: 67
Views: 6301

Re: DOT Rules Airlines Can’t Ban Pit Bulls and Other Service Animal Breeds

https://www.nytimes.com/2019/08/17/trav ... plane.html
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I hope this is not too far off topic, but the DOT considers miniature horses service animals. I had no idea this was the case. I assume they mean a properly trained one and not a pet.

https://www.nytimes.com/2019/08/17/trav ... plane.html

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by MrBretz
Sat Aug 17, 2019 6:17 pm
Forum: Travel, Polls & Preferences
Topic: Mini Horse Service Animals on Airliners
Replies: 11
Views: 774

Mini Horse Service Animals on Airliners

https://www.nytimes.com/2019/08/17/trav ... plane.html
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Here is an interesting article about this topic. It says it is a reasonable thing to do for some people.

https://www.nytimes.com/2019/08/17/trav ... plane.html

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by MrBretz
Fri Aug 16, 2019 6:50 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

MSPNWA, please elaborate.

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by MrBretz
Fri Aug 16, 2019 6:12 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

The article just posted by Ray is an excellent summary of what has happened to date. The only thing I see missing is the cosmic rays influence.

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by MrBretz
Wed Aug 14, 2019 10:39 pm
Forum: Civil Aviation
Topic: Definition of Airport Closing Time?
Replies: 17
Views: 1970

Re: Definition of Airport Closing Time?

SNA has a pretty clear definition: No aircraft may engage in regularly scheduled commercial operations at John Wayne Airport as follows: (i) for departure operations between the hours of 10:00 p.m. and 7:00 a.m. (8:00 a.m. on Sundays) (local time), as measured at any John Wayne Airport noise monito...

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by MrBretz
Wed Aug 14, 2019 8:45 pm
Forum: Civil Aviation
Topic: Definition of Airport Closing Time?
Replies: 17
Views: 1970

Re: Definition of Airport Closing Time?

The inbound was from IAH. It was delayed for mechanical reasons and arrived at the gate at 21:20. The outbound was to EWR. Apparently, they pushed back at 21:57. They left the ground at 22:09. That was lucky for me. I thought I might have to drive back there and pick them up.

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by MrBretz
Wed Aug 14, 2019 7:15 pm
Forum: Civil Aviation
Topic: Definition of Airport Closing Time?
Replies: 17
Views: 1970

Definition of Airport Closing Time?

My local airport, SNA, stops all takeoffs and landings at 10PM. I discovered yesterday, when I dropped off some friends whose flight was delayed, closing time apparently meant when the plane pushed back from the gate. They "left" according to UA website at 9:57. However, when I followed th...

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by MrBretz
Mon Aug 12, 2019 6:58 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Regarding possible compensation, you all need to look at airline profit not revenue. Airlines seem to profit anywhere from 5 to 10 percent on their revenue. You might want to look at yahoo finance and examine AAL, DAL, UAL, etc. And someone might make the argument that the routes a 737 operate are t...

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by MrBretz
Fri Aug 09, 2019 11:12 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

My god, it seems that in this thread every possible component of the 737 MAX has been dissected, scrutinized and debated. I can't believe that there's anything left to discuss but I suspect some people will always find something else to analyze. This thread is now on its 40th and still counting pag...

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by MrBretz
Thu Aug 08, 2019 7:20 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Wledering, so you are saying the problem can be fixed in hardware. Are these types of computers used on a 737 or any other commercial airplane?

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by MrBretz
Thu Aug 08, 2019 6:51 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

If it covered specifically in FAR/JAR, I don’t know, but it is a relevant design requirement. ‘Bit Flipping’ or Single/Multiple Event Upset/Latching is an observable phenomenon and is the result of the impact of high energy neutrons released by the collision of cosmic radiation with matter in the a...

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by MrBretz
Wed Aug 07, 2019 7:12 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Is the cosmic ray flip flop test in the FAA regulations? No, but the surprise UFO appearance is. If it covered specifically in FAR/JAR, I don’t know, but it is a relevant design requirement. ‘Bit Flipping’ or Single/Multiple Event Upset/Latching is an observable phenomenon and is the result of the ...

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by MrBretz
Tue Aug 06, 2019 7:16 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

DenverTed wrote:
Is the cosmic ray flip flop test in the FAA regulations?


No, but the surprise UFO appearance is.

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by MrBretz
Mon Aug 05, 2019 8:47 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

New MCAS test flight: http://twitter.com/AirlineFlyer/status/1158446487560499203 I guess the test pilots know exactly what they’re doing (and have pre-briefed procedures if severely out of trim like rock-and-roll), but I still wouldn’t like to be on a plane futzing with MCAS activation at FL100... ...

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by MrBretz
Mon Aug 05, 2019 6:33 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

I am a Boeing fan. I think the CEO and some top engineering VPs and managers have to go. They were responsible. And they are paid generously and by the size of this fiasco deserve the boot. And the guy who said “make a safe plane safer” needs to be.....sorry, I have no polite words for that individu...

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by MrBretz
Sun Aug 04, 2019 9:19 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Revelation, I have to fly up to SEA in a couple of weeks. Maybe I will have my ears open and see if any Boeing software developers are on the plane and we can get to the bottom of the software mystery. I do know that on the ancient military aircraft I worked on, they did swap out the flight computer...

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by MrBretz
Sun Aug 04, 2019 6:07 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Thorkel, thanks for the VxWorks overview. What’s your guess on an OS for the computers aboard the MAX? I personally doubt there is one. I concur. This website lists the Boeing 737 software as written in Ada. https://www2.seas.gwu.edu/~mfeldman/ada-project-summary.html If it's correct, at least we k...

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by MrBretz
Sun Aug 04, 2019 4:37 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Thorkel, thanks for the VxWorks overview. What’s your guess on an OS for the computers aboard the MAX?

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by MrBretz
Sun Aug 04, 2019 12:21 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

This, and the fact that writing in "machine code" (assembly) you have pretty much direct control over the clock cycles. ie it is very clear how many clock cycles each instruction will take - knowing this is often more important than writing the fastest code. Not to dispute this, but in mo...

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by MrBretz
Sat Aug 03, 2019 2:05 am
Forum: Technical/Operations
Topic: SNA-takeoff procedure oddity
Replies: 24
Views: 4782

Re: SNA-takeoff procedure oddity

The takeoff is much duller than the old days. You don't climb as rapidly and the thrust isn't reduced as much as days gone by. All they do now is make a slight left turn to align over the back bay. After that, they make a slight right to realign so they can continue over the back bay and go over Bal...

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by MrBretz
Fri Aug 02, 2019 3:34 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

I’ve read the article and as another embedded software engineer I find it plausible as well. I also thin,k that the probability of this specific combination of bit flips occurring is very low. 1Kbit of memory already puts this in 10^-14 territory. 5 bit flips due to cosmic rays is in itself already...

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by MrBretz
Thu Aug 01, 2019 9:58 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

You are missing the point raised in this thread when the "microprocessor problem" first popped that this type of "architecture change" was started months ago. I'm not missing anything. Full rewrite might be in order, but I'm not buying the timeframe. I don't think that radical r...

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by MrBretz
Thu Aug 01, 2019 8:07 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

These words in the article concern me: "And in response to finding that new glitch, Boeing has developed a plan to fundamentally change the software architecture of the MAX flight-control system so that it will take input from both flight-control computers at once instead of using only one on a...

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by MrBretz
Tue Jul 30, 2019 11:10 pm
Forum: Civil Aviation
Topic: Trump Hosts Meeting b/w QR and the U.S. Carriers
Replies: 135
Views: 15930

Re: Trump Hosts Meeting b/w QR and the U.S. Carriers

US3 hardly represent the USA as FedEx, JetBlue, Atlas Air, Boeing, US Travel Association and many other groups have proven. The only thing US3 represent are the US3 and they would happily live in a market where they would hold near total control and minimal competition. Just like 45’s best buds at ...

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by MrBretz
Mon Jul 29, 2019 3:27 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Could it be that no one ever thought of what would happen if the one AoA sensor went out? I have trouble believing that. Or if they thought about what might happen, did they forget the MCAS logic? It is a large oversight. That being said, I doubt that anyone really understood how bad this could be. ...

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by MrBretz
Sat Jul 27, 2019 11:54 pm
Forum: Technical/Operations
Topic: A380 Slats
Replies: 14
Views: 3386

Re: A380 Slats

Thanks. So no taberons. I do like the A380 ailerons. They flutter like a bird's feathers.

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by MrBretz
Sat Jul 27, 2019 5:36 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

IADFCO, I am sure the pressure is on and the groups with expertise are totally committed. The problems with outsiders is bringing them up to speed. If your acquaintances had relevant experience that would help, I bet they would be there.

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by MrBretz
Sat Jul 27, 2019 4:29 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Yes, I agree. They are discussing the previously reported problem. We will never know what it really means. I think based on my experience eons ago in programming a flight computer, that a program that was scheduled to run, say 32/sec, to extrapolate things didn’t get done in the interval. The simul...

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by MrBretz
Sat Jul 27, 2019 3:37 pm
Forum: Technical/Operations
Topic: A380 Slats
Replies: 14
Views: 3386

Re: A380 Slats

another one question - is there any pics of "taberon" (high-speed aileron inside of flap)? Do you mean these things? https://www.youtube.com/watch?v=9vdmIVwmVKs https://www.youtube.com/watch?v=YqLyKwx8KNE Those are drooping ailerons AKA flaperons. I know. I just wondered what “taberons” w...

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by MrBretz
Fri Jul 26, 2019 11:35 pm
Forum: Technical/Operations
Topic: A380 Slats
Replies: 14
Views: 3386

Re: A380 Slats

https://www.youtube.com/watch?v=9vdmIVwmVKs

https://www.youtube.com/watch?v=YqLyKwx8KNE
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Armadillo1 wrote:
another one question - is there any pics of "taberon" (high-speed aileron inside of flap)?


Do you mean these things?

https://www.youtube.com/watch?v=9vdmIVwmVKs

https://www.youtube.com/watch?v=YqLyKwx8KNE

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by MrBretz
Wed Jul 24, 2019 1:20 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

PixelFlight wrote:
MrBretz wrote:
asdf wrote:

there will not be any UA MAX

there will be UA 737-8 or -9
;-)


Did they cancel their order for 100?

No. The 737-8/9 is simply the official name of the 737 MAX 8/9. The MAX is just a marketing name.


Thanks. I missed that renaming.

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by MrBretz
Tue Jul 23, 2019 6:00 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Munoz said a few months ago that any passenger not willing to fly on a UA MAX would be rebooked (presumably without penalty, but I have to go back and find the article). I'm curious to see whether he will keep his promise, and for how long. there will not be any UA MAX there will be UA 737-8 or -9 ...

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by MrBretz
Mon Jul 22, 2019 6:39 am
Forum: Technical/Operations
Topic: LAX simultaneous opposing direction runway ops
Replies: 22
Views: 3521

Re: LAX simultaneous opposing direction runway ops

I wonder what they do when the Santa Ana's are blowing from the east. Do they suspend easterly takeoffs during the late evening and early AM? The procedure is in the link you provided in your post above. They will depart east from the inboard runways 6R/7L only and discouraging reduced power takeof...

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by MrBretz
Mon Jul 22, 2019 1:52 am
Forum: Technical/Operations
Topic: LAX simultaneous opposing direction runway ops
Replies: 22
Views: 3521

Re: LAX simultaneous opposing direction runway ops

They've done this at LAX as long as I can remember. Note the times. They are in the early AM. It is noise abatement time. And as another poster said, it is perfectly safe when the winds are somewhat calm, like under 10 knots. Here is a link that describes the procedure. https://www.lawa.org/en/lawa-...

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by MrBretz
Tue Jul 09, 2019 6:23 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Thorkel, thanks for the informative post. Ada slipped my thought process since I never used it. Assuming you are right about Ada on the 777, what OS do you think was used on that project? Or maybe Ada comes with it’s own runtime environment to do periodic scheduling? As far as the 737, my guess is a...

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by MrBretz
Mon Jul 08, 2019 3:24 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

And the reason it most likely not in Java is because Java is an interpretive language. It runs on any processor with a processor dependent runtime engine. It’s transportable but slow. We are all just guessing because none of know anything about the software architecture or how it is implemented. Al...

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by MrBretz
Mon Jul 08, 2019 6:25 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Keesje, what kind of computers are used on A320’s? Were they upgraded for the NEO?

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by MrBretz
Mon Jul 08, 2019 1:30 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Thanks, PixelFlight. I found similar articles. I wonder if the OS is VxWorks?

However, to move to that is what BA should have done. You don’t upgrade; you build a new plane.

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by MrBretz
Mon Jul 08, 2019 12:30 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Also found this document about the Am2900 familly: https://en.wikichip.org/w/images/c/c4/The_Am2900_Family_Data_Book_With_Related_Support_Circuits_%281979%29.pdf I will not be surprised that the SDP-175/185 is based on a typical 16-bits micocomputer design like the one on the page 265 This is pre-1...

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by MrBretz
Sun Jul 07, 2019 5:50 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

I agree with this. That’s what we did years ago. They are probably reprogramming some C or C+ routines/objects in assembly language to get more speed. It is labor intensive but easy to check for errors with software simulations. One of my first thoughts when I heard about the "slow response ti...

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by MrBretz
Sat Jul 06, 2019 5:05 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

I don’t think September is realistic when dealing with faulty software and now microprocessors as well, it’s just PR to keep everyone’s confidence in the company up, we’ll see in September. It is hard to guess what the second problem fix entails without any hard information. But judging by how quic...

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by MrBretz
Mon Jul 01, 2019 6:19 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 2550
Views: 331309

Re: Boeing 737MAX Grounded Worldwide Q3 2019

the MCAS implementation went into infinite loop until full nose down...this was obviously stupid and where the problem lies. it will be fixed. nobody is taking any chances and the rest of the plane is getting a fine toothed comb people above need to can the offensive posts We really don’t know what...

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