Search found 309 matches

  • 1
  • 2
  • 3
  • 4
  • 5
  • 7
by WPIAeroGuy
Thu Oct 10, 2019 1:54 am
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 212
Views: 46865

Re: A320neo Family 'Excessive Pitch' Issue Thread

Can I ask you, what the exact definition of stall is in aviation? Perhaps this can help? http://www.aerospaceweb.org/question/aerodynamics/q0136.shtml In addition, Thin Airfoil Theory doesn't account for the fact that the lift coefficient eventually reaches a maximum and then starts decreasing. The...

Jump to post
by WPIAeroGuy
Sat Oct 05, 2019 12:50 am
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 212
Views: 46865

Re: A320neo Family 'Excessive Pitch' Issue Thread

To add to the above, by definition you cannot stall below the critical AoA even if your speed is below the ‘stall speed’. Stall is the point at which increasing the AoA does not increase lift and is caused by excessive flow separation from the wing. Stall speed is a function of aircraft weight and h...

Jump to post
by WPIAeroGuy
Sat Oct 05, 2019 12:47 am
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 212
Views: 46865

Re: A320neo Family 'Excessive Pitch' Issue Thread

Stall is AoA and only AoA dependent. Stall speed is an analog for measuring AoA and varies with weight. If you exceed critical AoA, regardless of speed you will stall. At low speeds, you need to maintain a higher AoA because your lift coefficient Cl varies approximately linearly with AoA. Lift = Cl*...

Jump to post
by WPIAeroGuy
Fri Oct 04, 2019 8:28 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019
Replies: 941
Views: 98893

Re: Boeing 737MAX Grounded Worldwide Q4 2019

This is one of the important elements of this story. If EICAS was already developed for the P-8 (737-800) - although not FAA certified - it means implementing the original MCAS from the 767 tankers would likely have been much easier and straight forward. The $10 billion figure sounds incredibly hig...

Jump to post
by WPIAeroGuy
Fri Oct 04, 2019 8:21 pm
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 212
Views: 46865

Re: A320neo Family 'Excessive Pitch' Issue Thread

Quote from the Leeham article: The AD and the explanation from Airbus singles out recently changed flight laws in the ELACs for the A321neo to be the root cause for the pitch-up described in the AD. It allows the Pilot to command fast dynamic pitch ups when in Flare mode (which is just before landin...

Jump to post
by WPIAeroGuy
Thu Oct 03, 2019 4:11 pm
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 212
Views: 46865

Re: A320neo Family 'Excessive Pitch' Issue Thread

https://leehamnews.com/2019/07/19/bjorn ... -up-issue/

Suggest you re read this. The whole issue was alpha protection was NOT able to prevent this under certain conditions.
-->

https://leehamnews.com/2019/07/19/bjorn ... -up-issue/

Suggest you re read this. The whole issue was alpha protection was NOT able to prevent this under certain conditions.

Jump to post
by WPIAeroGuy
Thu Oct 03, 2019 12:10 am
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 212
Views: 46865

Re: A320neo Family 'Excessive Pitch' Issue Thread

I do think there is a bit of talking past each other. Yes, speed has a 2nd order impact on stall (reducing speed reduces the local Reynolds number which shifts stall location a tiny bit). I think the concern was a sudden loss of lift ehich, since more change AoA is required to acheive the desired l...

Jump to post
by WPIAeroGuy
Wed Oct 02, 2019 11:07 pm
Forum: Civil Aviation
Topic: B17 Crash at BDL October 2nd, 2019
Replies: 156
Views: 29661

Re: B17 Crash at BDL October 2nd, 2019

I just flew on her recently. Was an amazing experience. My condolences to the passengers and crew. Absolutely terrible situation.

Jump to post
by WPIAeroGuy
Thu Sep 26, 2019 11:52 am
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 212
Views: 46865

Re: A320neo Family 'Excessive Pitch' Issue Thread

Stall speeds are just representations of AoA and will vary with aircraft weight, but will be constant at AOA, icing notwithstanding because now you’re changing the airfoil shape. A light airplane will respond to elevator/pitch input faster (lower moment of inertia) and the application of thrust will...

Jump to post
by WPIAeroGuy
Thu Sep 26, 2019 3:21 am
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 212
Views: 46865

Re: A320neo Family 'Excessive Pitch' Issue Thread

I think in this case it is semantics: An aircraft pitches upwards, so it increases its pitch and AoA, it does not angle up. You could write it increases its angle of attack but that also increases pitch during the flare (pitch is in general really low in this phase, I think 0-10)°. Anyway during fl...

Jump to post
by WPIAeroGuy
Wed Sep 25, 2019 9:41 pm
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 212
Views: 46865

Re: A320neo Family 'Excessive Pitch' Issue Thread

How much exceeded I could not tell either, never saw this but the condition is given: It occurs when the aircraft is in flare mode. @ VV If pitch becomes to big, or too high too fast, it could possibly lead to a stall. It takes time to spool up the engines and develop maximum thrust. If the pitch b...

Jump to post
by WPIAeroGuy
Wed Sep 25, 2019 10:27 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 585160

Re: Boeing 737MAX Grounded Worldwide Q3 2019

So you really took from WPIAeroGuy post that he disagreed with anything you just posted, unless I missed his intent, it seemed to me that he was saying that the need for pilots to understand the basics of flight is still required despite the improvement in technology, and as we have seen, pilots ha...

Jump to post
by WPIAeroGuy
Wed Sep 25, 2019 12:08 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 585160

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Bingo! So when things go crazy, what do you expect from a pilot? From a safety assessment point of view, the goal is to find a safe solution for every possible failures. Most failures can be mitigated at the system level, mainly by redundancy, and only if there not practicable solution at the syste...

Jump to post
by WPIAeroGuy
Tue Sep 24, 2019 1:14 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 585160

Re: Boeing 737MAX Grounded Worldwide Q3 2019

They couldn't predict the failure of the pilots not the sensor. Could, and moreover - should have done so; and hopefully will face consequences on both corporate and personal level for failure to do so. I could not disagree more. I'm sorry, but if you're an engineer in 2012 there is no way in hell ...

Jump to post
by WPIAeroGuy
Mon Sep 23, 2019 11:51 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 585160

Re: Boeing 737MAX Grounded Worldwide Q3 2019

[...] 2a. While everyone is looking at this crash with 20/20 hindsight, imagine your an engineer at Boeing circa 2012. I feel like no one actually understands how hard it would be to not only predict this failure mode, but convince superiors it was dangerous enough to warrant a redesign. Let's pret...

Jump to post
by WPIAeroGuy
Mon Sep 23, 2019 12:29 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 585160

Re: Boeing 737MAX Grounded Worldwide Q3 2019

I haven't posted in this thread in a while, but I've been following along. I've been meaning to post this for a while, hopefully it brings a slightly different perspective to the existing ideas. 1. In a hypothetical situation, let's say a Part 23 airplane has an engine failure at Vr that results in...

Jump to post
by WPIAeroGuy
Sun Sep 22, 2019 10:56 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 585160

Re: Boeing 737MAX Grounded Worldwide Q3 2019

I haven't posted in this thread in a while, but I've been following along. I've been meaning to post this for a while, hopefully it brings a slightly different perspective to the existing ideas. 1. In a hypothetical situation, let's say a Part 23 airplane has an engine failure at Vr that results in ...

Jump to post
by WPIAeroGuy
Wed May 22, 2019 1:17 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 390982

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Wrong. It is the result of a crew in an horrible situation who didn't monitor their speed, care or know to turn off the auto-throttle. Boeing can thrive on this gross negligence. Thrust has far less influence on speed than pitch, reducing thrust pitches the nose further down. Again a red herring in...

Jump to post
by WPIAeroGuy
Wed May 15, 2019 10:30 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 390982

Re: Boeing 737MAX Grounded Worldwide Q2 2019

One defect with 4 aircraft generations of 737, is the latest iteration uses the previous iteration as the baseline (plus scaling), not the 100/200 for which the original type certificate is held. STC's should be capped at two or maybe three generations. New generation 737s are not STCs. They are ad...

Jump to post
by WPIAeroGuy
Fri May 10, 2019 8:07 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 390982

Re: Boeing 737MAX Grounded Worldwide Q2 2019

See here: https://youtu.be/QytfYyHmxtc?t=2120 "We knew that FAA would not certify 2 sensor setup without level D training" I’ve seen this stated before, and I’m not doubting it’s true, but what is the logic behind it? Why would two sensor inputs require sim time while 1 does not? I’m not ...

Jump to post
by WPIAeroGuy
Sun May 05, 2019 1:44 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 390982

Re: Boeing 737MAX Grounded Worldwide Q2 2019

The one big difference with runaway trim is that if you hold the column in position to maintain attitude, ideally that stops the runaway — doesn’t work for MCAS. But I agree with what you say. Good point, I forgot about the column cutout switch. You guys are focusing on microproblems of design. Loo...

Jump to post
by WPIAeroGuy
Sun May 05, 2019 12:40 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 390982

Re: Boeing 737MAX Grounded Worldwide Q2 2019

training seems as efficient as it can be. It is hard, if at all possible, to train instant responses. And you're proposing totally unrealistic spending. WHat may make sense, though, is better engineering education (there is some progress lately, but it is slow). A much more cost efficient approach....

Jump to post
by WPIAeroGuy
Sat May 04, 2019 11:55 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 390982

Re: Boeing 737MAX Grounded Worldwide Q2 2019

No - I have always held lots of blame to go around - If I've had an Agenda it's to get people to realize that training has been lacking Worldwide and needs to be looked at - along with Boeing and the FAA training seems as efficient as it can be. It is hard, if at all possible, to train instant resp...

Jump to post
by WPIAeroGuy
Sun Apr 28, 2019 7:17 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

Thank you BravoOne, that's very enlightening.

Jump to post
by WPIAeroGuy
Sat Apr 27, 2019 4:16 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

It’s because morrisond and OldAeroGuy are correct and are using the aerodynamic definition of stability. Stability has NOTHING to do with control feel. The reason those two are being so ‘stubborn’ is because there’s a huge physical difference between a stable and an unstable plane. The F-117A was u...

Jump to post
by WPIAeroGuy
Sat Apr 27, 2019 12:41 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

morrisond wrote: Well the bizarre thing is MCAS isn't really needed to make the MAX safe - it's just needed MCAS to meet a specific regulation that the MAX was barely over on. It's pretty clear by now morrisond and OldAeroGuy are either engaged in astroturfing or self identify with Boeing to the po...

Jump to post
by WPIAeroGuy
Thu Apr 25, 2019 8:43 pm
Forum: Civil Aviation
Topic: United Airlines "Evolution" to Globe Livery released
Replies: 1797
Views: 367813

Re: United Airlines "Evolution" to Globe Livery released

While better than the current, it's unfortunate they did not push the thinking further...for example, if you have a light blue and medium blue tail, why not incorporate more of that light blue on the rest of the fuselage to harmonize. For example, maybe use light blue as shadow on the UNITED titles...

Jump to post
by WPIAeroGuy
Tue Apr 23, 2019 9:45 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

Airplanes don’t just stall, two good engines, pitch angle (confirmed on both sides and the standby) around 12-14 degrees, ground going away—it’s flying regardless of stick shakers, MCAS, other warnings. I flew a military plane that had a well known procedure for stall warning, if it was flying turn...

Jump to post
by WPIAeroGuy
Tue Apr 23, 2019 9:44 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

[threeid][/threeid] Airplanes don’t just stall, two good engines, pitch angle (confirmed on both sides and the standby) around 12-14 degrees, ground going away—it’s flying regardless of stick shakers, MCAS, other warnings. I flew a military plane that had a well known procedure for stall warning, if...

Jump to post
by WPIAeroGuy
Tue Apr 23, 2019 9:29 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

I'd like to break the endless back and forth that is going for the last 10 pages, and leads nowhere. Instead, please answer the question: what would be an effect of SINGLE (one time, 2.5deg down) false MCAS activation at low altitude. Say, shortly after take-off. How quickly do you think a prepared...

Jump to post
by WPIAeroGuy
Tue Apr 23, 2019 12:37 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

Can you show "stall prevention system" being defined in a real document? I cannot find any definition which would be relevant to certification issues. I couldn't find a formal definition in Part 25, but I think the difference that people are trying to get across is that a "stall prev...

Jump to post
by WPIAeroGuy
Mon Apr 22, 2019 11:39 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

I think what people have been saying is "stall prevention systems" have a very specific definition. MCAS does not meet that definition. It is about stall prevention, but that is not quite the same. And the Red Queen says ..... LOL Can you show "stall prevention system" being def...

Jump to post
by WPIAeroGuy
Mon Apr 22, 2019 10:32 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

OldAeroGuy and Galaxyflyer, thanks for all of you're patience. I'm sure there are many on here that read what you post, and try to learn from it. Others it seems , look for fault in your answers, and will continually ask over and over again, the same question looking for a different interpretation ...

Jump to post
by WPIAeroGuy
Sun Apr 21, 2019 11:14 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

Boeing’s rushed attempt to counter the NEO produced an aircraft that is inherently unstable. Do you have any data or a source to support your statement? Adding MCAS to solve an approach to stall "stick lightening" handling issue does not mean the MAX is "inherently unstable". He...

Jump to post
by WPIAeroGuy
Fri Apr 19, 2019 8:21 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

MCAS was a commercial requirement, not an engineering requirement. It was added so that Max handling characteristics was same as NG, to prevent additional training which could cost Boeing sales or reduced profits. Why introduce additional points of failure even though it *might* have been mitigated...

Jump to post
by WPIAeroGuy
Fri Apr 19, 2019 8:19 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

Definition of safety engineering: Safety engineering is the process of design o prevent accidents. Engineering Safety Concepts provide detailed approaches and modes for accident reduction by using a risk management process to identify and "design out" hazards. Do Boeing employ "unsaf...

Jump to post
by WPIAeroGuy
Fri Apr 19, 2019 7:55 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

Amiga500 wrote:
WPIAeroGuy wrote:
What do you mean 'to begin with?'


That is blindingly obvious.

Lets start with 1 sensor input.


I was asking XRAYretired to clarify if he was referring to the concept of a 737MAX being unsafe or specifically MCAS implementation. It is now clear he meant MCAS implementation.

Jump to post
by WPIAeroGuy
Fri Apr 19, 2019 6:44 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

So the 5 failure modes that can cause stab runaway on NG - are they serious and can they bring a plane down. And how often do they happen? The 6th failure we already know is serious and can bring planes down. No doubt we can reduce the amount of times it fails. And no doubt we can reduce how strong...

Jump to post
by WPIAeroGuy
Fri Apr 19, 2019 6:35 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

MCAS was a commercial requirement, not an engineering requirement. It was added so that Max handling characteristics was same as NG, to prevent additional training which could cost Boeing sales or reduced profits. Why introduce additional points of failure even though it *might* have been mitigated...

Jump to post
by WPIAeroGuy
Fri Apr 19, 2019 6:31 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 721779

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

What you are posting simply is not true. Any changes to the MAX from the NG is certified to FAR standards at the date when the FAA accepted their application. It would meet the current stability requirements. Well You are a lot more experienced in that things than me I Will Go find and Check back t...

Jump to post
by WPIAeroGuy
Fri Apr 19, 2019 6:24 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

The now a bit old Boeing excuse for hiding MCAS. Just a simple runaway trim. The question is not if somebody describes the MCAS failure as run away trim, but if the pilot recognize the MCAS failure mode as a run away trim. Two examples show that pilots do not think instantly "run away trim&quo...

Jump to post
by WPIAeroGuy
Fri Apr 19, 2019 5:59 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 720420

Re: B737MAX Grounded Worldwide

So you are happy to introduce extra risks to a plane that was previously safer to fly? (The NG that is) Why would you accept a plane that needs this add on? It's clearly riskier than not needing it at all? Why are we accepting extra risks with such an important plane? What do we gain by the extra r...

Jump to post
by WPIAeroGuy
Sat Apr 13, 2019 5:04 pm
Forum: Technical/Operations
Topic: MAX nacelle, AOA, center of lift, and C/G
Replies: 193
Views: 14445

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

Interesting : yes. but the scaling is all wrong. proportionally the Leap1Bs are much bigger in relation to the airframe. ( shorter tail, smaller stab ..) What does that matter? You still may find that the derivative of the curve goes negative, indicating non-linearly increasing control forces. Deal...

Jump to post
by WPIAeroGuy
Sat Apr 13, 2019 3:10 pm
Forum: Technical/Operations
Topic: MAX nacelle, AOA, center of lift, and C/G
Replies: 193
Views: 14445

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

It would be interesting to see a comparison of the A340-300 vs the A340-500 "stick fixed" Cm vs AoA curves, up to and through stall. Interesting : yes. but the scaling is all wrong. proportionally the Leap1Bs are much bigger in relation to the airframe. ( shorter tail, smaller stab ..) Wh...

Jump to post
by WPIAeroGuy
Sat Apr 13, 2019 2:59 pm
Forum: Civil Aviation
Topic: OSM Aviation orders 60 all-electric planes
Replies: 55
Views: 5413

Re: OSM Aviation orders 60 all-electric planes

I'm not buying the range numbers either. A typical piston engine airplane will cruise at 55-75% power at altitude. This is easily tabulated in the POH based on density altitude and RPM. The L/D is about twice that of a 152, implying they're getting most of their benefit from a slippery airframe, not...

Jump to post
by WPIAeroGuy
Sat Apr 13, 2019 12:23 pm
Forum: Technical/Operations
Topic: MAX nacelle, AOA, center of lift, and C/G
Replies: 193
Views: 14445

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

Are the A340 nacelle tops as close to the wing chord as nacelle tops on a MAX? Visually, it appears that the MAX is closer. Plus, very different frame lengths, 4 engines vs. 2, and FBW vs. kludge. I think such a severe word, "kludge", is appropriate. The consequences may have been unknown...

Jump to post
by WPIAeroGuy
Fri Apr 12, 2019 8:10 pm
Forum: Technical/Operations
Topic: MAX nacelle, AOA, center of lift, and C/G
Replies: 193
Views: 14445

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

Starlionblue wrote:
In an FBW Airbus, pitch input is proportional to load factor demand, not pitch rate.

In Alpha Prot, it becomes proportional to AoA.


Thank you, I knew it wasn’t proportional to elevator deflection. Is aileron control proportional to roll rate? That may be what I’m confusing it with.

Jump to post
by WPIAeroGuy
Fri Apr 12, 2019 3:11 pm
Forum: Technical/Operations
Topic: MAX nacelle, AOA, center of lift, and C/G
Replies: 193
Views: 14445

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

I found this image in one of the Civ Av threads It may be that this photo displays some wide-angle distortion, but the degree to which the MAX engines are more forward and higher than before is abundantly clear. And assuming this is landing phase, we are witnessing a some AoA (i.e. not high, but no...

Jump to post
by WPIAeroGuy
Mon Apr 01, 2019 8:01 pm
Forum: Civil Aviation
Topic: Has grandfathering been taken too far?
Replies: 362
Views: 17582

Re: Boeing 777-8/-9 Grandfathering Certification, 777X or 7X7?

... sharing components and having a common type certificate does mean the Max 8 only has to be built to the standards of the 737-100. did you really itended to say that? But thank you . This is the correct version. Quite certain WPIAeroGuy mean't "Doesn't" based on the context. Typos happ...

Jump to post
by WPIAeroGuy
Mon Apr 01, 2019 5:04 pm
Forum: Civil Aviation
Topic: Has grandfathering been taken too far?
Replies: 362
Views: 17582

Re: Boeing 777-8/-9 Grandfathering Certification, 777X or 7X7?

Taken to the extreme, OP would want you to re-certify every single aircraft that comes off the line - why do I say this? Because every single aircraft that comes off the line is different than the one that came before. Fasteners aren't exactly the same, materials are substituted as needed due to su...

Jump to post
  • 1
  • 2
  • 3
  • 4
  • 5
  • 7