Search found 262 matches

by LDRA
Thu Jul 18, 2019 10:15 pm
Forum: Civil Aviation
Topic: Boeing Expects a $5.6 Billion Hit for 737 Max Disruptions
Replies: 117
Views: 11098

Re: Boeing Expects a $5.6 Billion Hit for 737 Max Disruptions

The charge is much less than expected. Boeing stock is doing ok, only down a little bit

Jump to post
by LDRA
Mon Jul 15, 2019 2:15 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

I don't know why EASA is calling manual trim system "aisle stand trim switches". Could be what Boeing is referring to manual trim system in their submitted document

The EASA document does specifically refers to trim wheel later in the same cited paragraphs

Jump to post
by LDRA
Mon Jul 15, 2019 3:24 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

EASA POSITION [The trim systems on the 737Max provide an appropriate level of safety relative to longitudinal trim capability. I don't fully understand all of what they are saying, but this last sentence seems clear enough. No problem with the trim system? Provided the manual trim wheel always work...

Jump to post
by LDRA
Mon Jul 15, 2019 2:01 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

At Vmo, Max electric trim is inhabited BY DESIGN. So it does not even take failure conditions to need to use manual trim wheel. Did you mean inhibited? Where did this information come from? IIRC it isn’t on the NG. Please enlighten. Sorry should say inhibited. It is Max only, for detail see below h...

Jump to post
by LDRA
Sun Jul 14, 2019 11:55 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

However, if it isn't difficult to turn in normal situations (e.g. the electric motor stopped working) then it doesn't matter if there are female pilots. It's not like all male pilots are bodybuilders either. The males can't turn it in a severe out of trim situation either. The whole plane is design...

Jump to post
by LDRA
Sun Jul 14, 2019 7:52 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

https://www.marketscreener.com/BOEING-COMPANY-THE-4816/news/Boeing-737-MAX-Grounding-Could-Stretch-Into-2020-28902581/ Hmmm... hinting that the manual trim wheel may need to be modified.. but thats just my guess. You cant really expect the FAA to give a minute by minute summary I suppose. The trim ...

Jump to post
by LDRA
Sun Jul 14, 2019 5:47 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

How is Boeing going to fix manual trim wheel? Mandate pilot training and physical strength test?

Jump to post
by LDRA
Sun Jul 14, 2019 1:52 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Firing working level technical staff solves zero issue. They need to look at Boeing corporate management, the ones that are company officers Unless it is shown that corporate management made the call on the MCAS design I disagree. It is most likely engineers and engineering managers that made the c...

Jump to post
by LDRA
Sat Jul 13, 2019 7:25 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Firing working level technical staff solves zero issue. They need to look at Boeing corporate management, the ones that are company officers

Jump to post
by LDRA
Wed Jul 10, 2019 11:53 pm
Forum: Technical/Operations
Topic: Mandate fly-by-wire for transport class aircraft through Part 25 regulation?
Replies: 9
Views: 1836

Re: Mandate fly-by-wire for transport class aircraft through Part 25 regulation?

What you all think about requiring transport class aircraft to have fly-by-wire in order to get certified? Fly-by-wire architecure provides opportunities for major safety features such as alpha protection, overload protection, over rotation protection etc. Most newly developed models are FBW anyway...

Jump to post
by LDRA
Tue Jul 09, 2019 2:52 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

DO-178 came out in 80s or early 90s right?

Jump to post
by LDRA
Tue Jul 09, 2019 1:51 am
Forum: Civil Aviation
Topic: Delta Benefits from MAX Groundings
Replies: 16
Views: 4365

Re: Delta Benefits from MAX Groundings

Well, Delta has not started taking delivery of A321NEO right? So how does Delta benefit? WN, AA and UA can always lease extra NG or CEO

Jump to post
by LDRA
Tue Jul 09, 2019 1:20 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Boeing stock down today

Jump to post
by LDRA
Mon Jul 08, 2019 7:07 pm
Forum: Technical/Operations
Topic: Mandate fly-by-wire for transport class aircraft through Part 25 regulation?
Replies: 9
Views: 1836

Mandate fly-by-wire for transport class aircraft through Part 25 regulation?

What you all think about requiring transport class aircraft to have fly-by-wire in order to get certified? Fly-by-wire architecure provides opportunities for major safety features such as alpha protection, overload protection, over rotation protection etc. Most newly developed models are FBW anyways...

Jump to post
by LDRA
Mon Jul 08, 2019 11:11 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Super easy, ballast in the nose to shift CoG, so after CoG limit can be moved forward. Will probably solve some other issues related to trim Center of gravity has very little to do with MCAS issue. It is centre of thrust that matters (in relation to all surfaces that provide aerodynamic drag that o...

Jump to post
by LDRA
Mon Jul 08, 2019 1:13 am
Forum: Civil Aviation
Topic: AC A330 Fleet News and Updates Discussion Thread
Replies: 297
Views: 81342

Re: AC A330 Fleet News and Updates Discussion Thread

The newer ones from SQ, are they 233T MTOW? The old AC A333 are 215T right? The old AC A333s are 230t. The ex. SQ birds in service (2 of them so far) are 233t and 235 t. Click on the civil registration of each aircraft in the list below to see the MTOW. https://wwwapps.tc.gc.ca/saf-sec-sur/2/ccarcs...

Jump to post
by LDRA
Sun Jul 07, 2019 10:59 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Just got to wondering, what exactly would take in terms of a hardware upgrade for Boeing to ditch the MCAS software entirely, and build planes that actually fly, rather than depending on computer software that can fail. I assume first it would: 1) be expensive for the MAX program 2) need to entirel...

Jump to post
by LDRA
Sun Jul 07, 2019 10:43 pm
Forum: Civil Aviation
Topic: TAP schedules first non stop A321LR service between Europa and South America
Replies: 105
Views: 19274

Re: TAP schedules first non stop A321LR service between Europa and South America

Cabin pressure is regulated against external atmosphere pressure, so it is delta pressure that is controlled. 787 does allow more delta pressure, but it also tend to fly higher, negating the benefit

Jump to post
by LDRA
Sun Jul 07, 2019 10:13 pm
Forum: Civil Aviation
Topic: Flyadeal cancels 737 max Commitment
Replies: 72
Views: 14833

Re: Flyadeal cancels 737 max order

I was just reading recently online of a THIRD software glitch found after the recognition of the first two software glitches in regards to the MAX. What I could not figure out if the article's reporter had mistaken the third glitch for the second? ARE we really up to three glitches on the Software ...

Jump to post
by LDRA
Sun Jul 07, 2019 3:27 am
Forum: Civil Aviation
Topic: Could the 787 be scaled to create the 797?
Replies: 52
Views: 9207

Re: Could the 787 be scaled to create the 797?

Rather than scale 787, just make a 787-8 V2 for MoM. Redesign structure for 200T MTOW, using lessons learned from 1st gen 787 structure, new 5000lb MoM engines, center wing box tank deletion, done! 7 across is rather inefficient use of space anyways Smaller end of MoM space can be covered by NSA Th...

Jump to post
by LDRA
Sun Jul 07, 2019 2:37 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Trim wheel issue is likely Max only. Appearantly Max electrical trim " does not have enough authority to completely trim the aircraft longitudinally in certain corners of the flight envelope, e.g. gear up/flaps up, aft center of gravity, near Vmo/Mmo corner, and gear down/flaps up, at speeds a...

Jump to post
by LDRA
Sun Jul 07, 2019 2:07 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Trim wheel issue is likely Max only. Appearantly Max electrical trim " does not have enough authority to completely trim the aircraft longitudinally in certain corners of the flight envelope, e.g. gear up/flaps up, aft center of gravity, near Vmo/Mmo corner, and gear down/flaps up, at speeds ab...

Jump to post
by LDRA
Sat Jul 06, 2019 10:01 pm
Forum: Civil Aviation
Topic: Could the 787 be scaled to create the 797?
Replies: 52
Views: 9207

Re: Could the 787 be scaled to create the 797?

Rather than scale 787, just make a 787-8 V2 for MoM. Redesign structure for 200T MTOW, using lessons learned from 1st gen 787 structure, new 5000lb MoM engines, center wing box tank deletion, done!

7 across is rather inefficient use of space anyways

Smaller end of MoM space can be covered by NSA

Jump to post
by LDRA
Sat Jul 06, 2019 2:39 pm
Forum: Civil Aviation
Topic: AC A330 Fleet News and Updates Discussion Thread
Replies: 297
Views: 81342

Re: AC A330 Fleet News and Updates Discussion Thread

The newer ones from SQ, are they 233T MTOW? The old AC A333 are 215T right?

Jump to post
by LDRA
Thu Jul 04, 2019 4:53 pm
Forum: Civil Aviation
Topic: A321LR Versus XLR
Replies: 93
Views: 14741

Re: A321LR Versus XLR

That is right, he ACT in the forward hold takes two container position, probably for CG control purpose. Don't believe me, check ACAP your self No, @rbavfan is correct. The ACAP only currently references up to WV072 which is the A321LR. There is more fuel in the rear centre tanks, closer to the COG...

Jump to post
by LDRA
Thu Jul 04, 2019 12:28 am
Forum: Civil Aviation
Topic: Delta improves intl Main Cabin experience
Replies: 156
Views: 20790

Re: Delta improves intl Main Cabin experience

I just want more leg room, lower pressure altitude, more humid air.

I don't really mind bring my own meal on board.

Jump to post
by LDRA
Tue Jul 02, 2019 6:40 pm
Forum: Civil Aviation
Topic: Federal Prosecutors Expanding Boeing Investigation to CHS 787 Production Site
Replies: 154
Views: 18925

Re: Federal Prosecutors Expanding Boeing Investigation to CHS 787 Production Site

If any company sees making superior products only as a means of making money it will always be a second rate company. Boeing at this point is second rate - 3 out of 4 (actually 4 out of 5 if you include the 747) of their products are not selling, or just barely selling. That is not true. Boeing eff...

Jump to post
by LDRA
Tue Jul 02, 2019 1:43 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

There is nothing wrong with using single sensor, STS also relies on single air speed signal. The key is to limit control authority so that elevator still can overpower stab in fault condition From the Bloomberg article: "During the crashes of Lion Air and Ethiopian Airlines planes that killed ...

Jump to post
by LDRA
Tue Jul 02, 2019 1:21 pm
Forum: Civil Aviation
Topic: A321LR Versus XLR
Replies: 93
Views: 14741

Re: A321LR Versus XLR

The 3rd ACT only takes the place of 1 LD#-45 in the fwd hold, not 2. Not according to Airbus ACAP document According the the A321XLR specs the RCT has greater capacity than the 2 ACT's in the rear hold of the A321neoLR, but takes only the space of 1 ACT. It also notes there is an option for 1 ACT i...

Jump to post
by LDRA
Mon Jul 01, 2019 10:09 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Reading online it appears the actual failure mode tested is one FCC inop. That configuration requires the second FCC to handle more computation than normal case. It does appear that worst case computation resource analysis is botched so that FCC task overrun and hence electric trim not responding i...

Jump to post
by LDRA
Mon Jul 01, 2019 7:28 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Reading online it appears the actual failure mode tested is one FCC inop. That configuration requires the second FCC to handle more computation than normal case. It does appear that worst case computation resource analysis is botched so that FCC task overrun and hence electric trim not responding is...

Jump to post
by LDRA
Mon Jul 01, 2019 4:01 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Two sensors also means twice the failure rate. So availability of MCAS actually goes down with two sensors solution That probably why Airbus now mount 4 AoA sensors on the A350: to quadruple the failure rate and to slash as down as possible the availability... Thanks for the joke :rotfl: Why Boeing...

Jump to post
by LDRA
Mon Jul 01, 2019 3:29 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Seriously - there is an opportunity to make the plane safer with two sensors AND limiting authority But people are proposing just limit the authority next time and just accept more fault conditions in the future rather than less? Why? Really - that's the approach to safety now is it? On a plane thi...

Jump to post
by LDRA
Mon Jul 01, 2019 2:25 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

From the Bloomberg article: "During the crashes of Lion Air and Ethiopian Airlines planes that killed 346 people, investigators suspect, the MCAS system pushed the planes into uncontrollable dives because of bad data from a single sensor. That design violated basic principles of redundancy for...

Jump to post
by LDRA
Mon Jul 01, 2019 1:53 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

There is nothing wrong with using single sensor, STS also relies on single air speed signal. The key is to limit control authority so that elevator still can overpower stab in fault condition From the Bloomberg article: "During the crashes of Lion Air and Ethiopian Airlines planes that killed ...

Jump to post
by LDRA
Mon Jul 01, 2019 2:04 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

There is nothing wrong with using single sensor, STS also relies on single air speed signal. The key is to limit control authority so that elevator still can overpower stab in fault condition

Jump to post
by LDRA
Sun Jun 30, 2019 10:23 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 827
Views: 118477

Re: Boeing 737MAX Grounded Worldwide Q3 2019

As mentioned in old thread, for flight control software, nowadays, most control law type software source code is auto generated by computer from control algo graphic model.

Manually coding math intensive type of software is quite inefficient

I doubt MCAS software is outsourced overseas

Jump to post
by LDRA
Sun Jun 30, 2019 9:25 pm
Forum: Technical/Operations
Topic: Operating Weights of Emirates 777-300ER's
Replies: 14
Views: 3249

Re: Operating Weights of Emirates 777-300ER's

Late built 77W has significant weight reduction, deleting structure related to tail skid, redo the wiring conduit in attic space etc.

Jump to post
by LDRA
Sun Jun 30, 2019 3:01 pm
Forum: Civil Aviation
Topic: Federal Prosecutors Expanding Boeing Investigation to CHS 787 Production Site
Replies: 154
Views: 18925

Re: Federal Prosecutors Expanding Boeing Investigation to CHS 787 Production Site

Not for long. Their high stock price is on borrowed time once the financials start dragging it down due to lawsuits from airlines for groundings, re-training, retrofitting, and loss of business...not to mention the amount that will be paid out in fines, settlements and lawyer fees from the crashes....

Jump to post
by LDRA
Sun Jun 30, 2019 2:57 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383110

Re: Boeing 737MAX Grounded Worldwide Q2 2019

I really wonder why people get so angry about outsourcing. Our company does it, we outsourced the cleaning, the accounting and the hosting. There is nothing bad in that because why hire a cleaner for 2h a week when you can outsource it. The same goes for big companies, you can buy in expertise for ...

Jump to post
by LDRA
Sun Jun 30, 2019 1:52 am
Forum: Civil Aviation
Topic: Federal Prosecutors Expanding Boeing Investigation to CHS 787 Production Site
Replies: 154
Views: 18925

Re: Federal Prosecutors Expanding Boeing Investigation to Alleged Shoddy 787 Siteuror

hiflyeras wrote:
Boeing is a company in crisis. I hate to say it but their survival as a leading commercial aircraft manufacturer is in jeopardy. The drip drip of bad news is killing them.

Their stock price is doing ok. Therefore it is not that bad

Jump to post
by LDRA
Sat Jun 29, 2019 11:06 pm
Forum: Travel, Polls & Preferences
Topic: Boeing 767-longest running commercial airliner without a major upgrade?
Replies: 10
Views: 1868

Re: Boeing 767-longest running commercial airliner without a major upgrade?

Since 767 is still being produced, are there revisions to avionic boxes? I am pretty sure all the old processors on original 767 are no longer available

Jump to post
by LDRA
Sat Jun 29, 2019 4:11 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383110

Re: Boeing 737MAX Grounded Worldwide Q2 2019

MCAS 1.0 was an honest mistake in system requirement. If the system requirement had correctly limited final MCAS trim command authority to 2.5 degrees, there will not be Lion air crash. Using single AoA sensor is perfectly fine, as long as control authority is limited You must be glass half-full ki...

Jump to post
by LDRA
Sat Jun 29, 2019 4:08 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383110

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Wow, I am amazed to learn that so much of the Max, and 787 software is being outsourced. Please share your impression of how much of the MAX and 787 software is being outsourced, and why you think it is "so much". For critical product, such as an airplane, any part of s/w outsourced is to...

Jump to post
by LDRA
Sat Jun 29, 2019 3:59 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383110

Re: Boeing 737MAX Grounded Worldwide Q2 2019

I have been following the news quietly but the narrative looks worse and worse for Boeing. The idea that MCAS 1.0 was an oversight or honest mistake by the engineers is looking less and less likely. It starts to look like a deliberate decision as other options faced huge hurdles in the flight contr...

Jump to post
by LDRA
Sat Jun 29, 2019 3:46 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383110

Re: Boeing 737MAX Grounded Worldwide Q2 2019

I believe Boeing did not use HCL or Cyient for MCAS. However I remember reading from somewhere months ago that MCAS SW was subcontracted to some other company which I cannot remember else than it had a respected American company name. Whether that other company used 9$ engineers is another discussi...

Jump to post
by LDRA
Fri Jun 28, 2019 2:07 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383110

Re: Boeing 737MAX Grounded Worldwide Q2 2019

The other thing, in terms of timeliness, is that if these chips are associated with real-time constraints is they won’t be running anything approaching a ‘normal’ OS. They’ll be no pre-emotive multitasking or anything like that (again, doesn’t help for worst case execution times). It’ll be single t...

Jump to post
by LDRA
Thu Jun 27, 2019 6:19 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383110

Re: Boeing 737MAX Grounded Worldwide Q2 2019

As I read it, the 3 seconds is about control response to an upset, e.g. pulling the stick back and getting a relevant response when the nose drops unexpectedly, within 3 seconds. It has nothing to do or say about identifying an airframe or system cause of the upset in the first place or doing somet...

Jump to post
by LDRA
Thu Jun 27, 2019 1:50 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383110

Re: Boeing 737MAX Grounded Worldwide Q2 2019

kayik wrote:
Would you be surprised if this was a PR effort staging how effective FAA is and not rubber stamping at all?

And Boeing provided ammo

Jump to post