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by OldAeroGuy
Thu Nov 26, 2020 3:34 am
Forum: Civil Aviation
Topic: John Leahy blames the engines for the A380 failure-in service in 10 years? 2nd life after 2024?
Replies: 476
Views: 55981

Re: John Leahy blames the engines for the A380 failure

the A380 might have been a winner had the 747 not been there but the 747-400 already was worldwide. Did they expect airlines to replace them 1:1? There were fewer 747-400's produced than most people realize. If you look at all 747-400 models ( passenger, freighter and combi's), the total production...

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by OldAeroGuy
Thu Nov 12, 2020 1:51 pm
Forum: Technical/Operations
Topic: 777x vs 787
Replies: 9
Views: 2477

Re: 777x vs 787

GSOtoIND wrote:
Also, did Boeing keep the old horizontal stabilizer on the 777X?


No, the 777X has a larger h.tail to match the its larger wing.

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by OldAeroGuy
Tue Sep 29, 2020 3:23 pm
Forum: Civil Aviation
Topic: GE9X Engine For Boeing 777X Earns FAA Certification
Replies: 85
Views: 12858

Re: GE9X Engine For Boeing 777X Earns FAA Certification

jagraham wrote:
OldAeroGuy wrote:
zeke wrote:

Not bad if the advertised 10% TSFC improvement over the GE90-115 is being met.


add a little more fuel burn for the larger diameter, but agreed.


Fan diameter should be included in the 10%.

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by OldAeroGuy
Mon Sep 28, 2020 2:01 pm
Forum: Civil Aviation
Topic: GE9X Engine For Boeing 777X Earns FAA Certification
Replies: 85
Views: 12858

Re: GE9X Engine For Boeing 777X Earns FAA Certification

GE Aviation’s GE9X, the largest aircraft engine yet developed, has received FAA certification at September 25th 2020, marking a major step toward entry-into-service on the Boeing 777-9, the first of the 777X family, in 2022. See : https://aviationweek.com/aerospace/aircraft-propulsion/ge9x-engine-b...

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by OldAeroGuy
Fri Sep 11, 2020 2:43 pm
Forum: Technical/Operations
Topic: Why no more multi-slot flaps?
Replies: 32
Views: 4478

Re: Why no more multi-slot flaps?

The 777 Classic has double slot inboard flaps. The outboard flap is single slot. It has a design heritage related to the 767. Reduction of flap slots helps approach noise by reduced landing flap drag (less thrust required) and less airframe noise (slots whistle). As Starlionblue describes, using the...

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by OldAeroGuy
Wed Sep 02, 2020 8:40 pm
Forum: Technical/Operations
Topic: Did Boeing ever plan to build a single deck 747?
Replies: 34
Views: 3060

Re: Did Boeing ever plan to build a single deck 747?

Airbus toyed with a single deck design during the early stages of A380 development. The basic idea was two A330/A340 fuselages next to each other for a double bubble. It would have been over 11 meters wide, compared to the A380s 7.1 meters. IIRC, modeling showed that this would have been aerodynami...

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by OldAeroGuy
Sat Aug 15, 2020 10:17 pm
Forum: Civil Aviation
Topic: Why did Boeing say that the 727 replacement was the 757?
Replies: 96
Views: 15357

Re: Why did Boeing say that the 727 replacement was the 757?

Somewhere in my bookshelf I have a newspaper cutting (from the UK's "Guardian") showing an artist's impression of the 757. It was, in fact, a Rolls Royce advertisement declaring, "The RB211-535 has just taken off!". The 757 had two underwing engines, a T-tail, and the complete 7...

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by OldAeroGuy
Sun Aug 09, 2020 4:53 am
Forum: Civil Aviation
Topic: 777-9 Boarding Through Door 2L Not Possible?
Replies: 11
Views: 4906

Re: 777-9 Boarding Through Door 2L Not Possible?

ikramerica wrote:
Looks about the same as the 772. One knock against the 773 is they kept the door spacing which makes placing premium seating awkward.


Yep, you've got it. It also helps separate the classes. The upper crust turns left when boarding while the teeming masses turn right.

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by OldAeroGuy
Sun Aug 09, 2020 4:47 am
Forum: Civil Aviation
Topic: Future Heavy Freight Aircraft (777X)?
Replies: 78
Views: 12927

Re: Future Heavy Freight Aircraft (777X)?

Is it made of cast iron? The 777LR and 777-300ER have the same 347-351t MTOW. Empty weight difference is 22,700kg and the fuselage is 10.1m longer. That is 2,247kg per metre of fuselage. The 777-200ER and 777-300 have the same 297-299t MTOW. Empty weight difference is 22,430kg. That is 2,220kg per ...

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by OldAeroGuy
Sun Aug 09, 2020 4:01 am
Forum: Civil Aviation
Topic: 777-9 Boarding Through Door 2L Not Possible?
Replies: 11
Views: 4906

Re: 777-9 Boarding Through Door 2L Not Possible?

Nope, 2L will the 777-9 primary loading door. Door and engine geometry were carefully considered to allow adequate loading bridge clearance.

777-9 Door 2 placement allows for a more efficient seating arrangement than prior 777 models.

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by OldAeroGuy
Thu Jul 09, 2020 2:07 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

https://flightaware.com/live/flight/BOE ... /KMWH/KBFI

Today’s flight is testing the autoland system


If autoland testing is being done, it indicates the high lift system has been finalized.
-->

Opus99 wrote:
VCVSpotter wrote:
777-9 N779XX filed MWH-BFI 9:12AM - 9:42AM as BOE2.

https://flightaware.com/live/flight/BOE ... /KMWH/KBFI

Today’s flight is testing the autoland system


If autoland testing is being done, it indicates the high lift system has been finalized.

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by OldAeroGuy
Sat Jun 13, 2020 2:01 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

How many test flight hours are required for certification? I expect it is more successfully completing all of the various testing milestones than raw accumulation of hours, though some milestones will require certain minimum flight hours (the ETOPS testing, for example). Good answer. In addition, t...

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by OldAeroGuy
Thu Jun 04, 2020 12:00 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

[quote="VCVSpotter"

According to this it was HPT ACC testing on June 2 (and no, I don’t know what that means but I’m sure someone on here does).
[/quote]

High Pressure Turbine -> HPT

Active Clearance Control -> ACC

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by OldAeroGuy
Sat May 30, 2020 7:43 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

That flight is filed up to 35,000ft. Will this be the first flight up to cruising altitudes? No, on May 28, this airplane flew at FL340 and FL360. https://flightaware.com/live/flight/BOE2/history/20200528/2100Z/KBFI/KGEG Thanks OAG. Good to see the progress Today's flight is currently at FL400 afte...

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by OldAeroGuy
Sat May 30, 2020 5:32 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

777-9 N779XX filed BFI-BFI as BOE2 11AM - 1:21PM https://flightaware.com/live/flight/BOE2 That flight is filed up to 35,000ft. Will this be the first flight up to cruising altitudes? No, on May 28, this airplane flew at FL340 and FL360. https://flightaware.com/live/flight/BOE2/history/20200528/2100...

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by OldAeroGuy
Sat May 23, 2020 1:55 pm
Forum: Civil Aviation
Topic: 777 - 25 years in commercial service
Replies: 147
Views: 14646

Re: 777 - 25 years in commercial service

Max Q wrote:
Was the triple the first Jet transport with a completely circular fuselage?


No, the A300 and it's derivatives (A310, A330 & A340) beat them to it.

There may be others, I'm feeling too lazy to research the topic right now.

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by OldAeroGuy
Fri May 22, 2020 1:35 pm
Forum: Civil Aviation
Topic: 777 - 25 years in commercial service
Replies: 147
Views: 14646

Re: 777 - 25 years in commercial service

https://runwaygirlnetwork.com/2018/11/0 ... 9-abreast/
-->

Dmoney wrote:
A330 and A350 are built so that 8&9 abreast is the only reasonable layout and perfectly fine.


But it's not like Airbus has never promoted 9 A/B on the A330.

https://runwaygirlnetwork.com/2018/11/0 ... 9-abreast/

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by OldAeroGuy
Tue May 12, 2020 10:49 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

Which in turn put's a high load on the keel? - so if you had any concerns with Keel not having sufficient strength (it's what failed in the 777X wing test) then you would not run the tests? The tail loads during a stall are dynamic, ie the tail bounces around a lot in the wing wake and the concern ...

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by OldAeroGuy
Tue May 12, 2020 6:37 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

Based on past Cert Program experience, I suspect the airplane has been stalled several times at all flap settings and at forward and aft CG's. The saw tooth altitude traces along with speed changes seen for some flight tests appear to indicate stall testing. Wing loads are not particularly high dur...

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by OldAeroGuy
Tue May 12, 2020 4:07 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

Based on past Cert Program experience, I suspect the airplane has been stalled several times at all flap settings and at forward and aft CG's. The saw tooth altitude traces along with speed changes seen for some flight tests appear to indicate stall testing. Wing loads are not particularly high duri...

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by OldAeroGuy
Fri Mar 06, 2020 9:37 pm
Forum: Civil Aviation
Topic: Does Boeing continually improve their products?
Replies: 53
Views: 6869

Re: Do Boeing continually improve their products?

Yes. See how much better the 737 is today, compared to the one built in the late 50's. Incremental advances are visible. You're 10 years too early. The initial 737 EIS was in the late '60's. Well, the technology and the fuselage were from the 50’s. So it started off as a ”max” already. No, the tech...

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by OldAeroGuy
Fri Mar 06, 2020 3:54 am
Forum: Civil Aviation
Topic: Does Boeing continually improve their products?
Replies: 53
Views: 6869

Re: Do Boeing continually improve their products?

AirKevin wrote:
..... I remember right, the bacon lights were made more aerodynamic.


Yes, before the aerodynamic clean up, they made an annoying sizzling sound.

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by OldAeroGuy
Fri Mar 06, 2020 3:50 am
Forum: Civil Aviation
Topic: Does Boeing continually improve their products?
Replies: 53
Views: 6869

Re: Do Boeing continually improve their products?

Carlos01 wrote:
Yes. See how much better the 737 is today, compared to the one built in the late 50's. Incremental advances are visible.


You're 10 years too early.

The initial 737 EIS was in the late '60's.

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by OldAeroGuy
Fri Feb 14, 2020 1:09 am
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

Yesterday / Wednesday there were Boeing (Mounir) and FAA (Dickson) updates on 777X testing and certification. Boeing are anticipating 777X entry into service in 2 years. https://leehamnews.com/2020/02/13/max-777x-certifications-questions-abound-at-singapore-airshow/#more-32577 The Leeham article ha...

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by OldAeroGuy
Thu Feb 13, 2020 2:18 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

Boeing 779 N779XW at GEG https://pbs.twimg.com/media/EQi_BC6XsAUY6_c?format=jpg https://pbs.twimg.com/media/EQi_BD_XsAw4VJH?format=jpg https://twitter.com/Peytonloumar/status/1227440976806936589?s=20 Your GEG pictures are interesting and they show a 777-9 feature I hadn't appreciated before. The in...

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by OldAeroGuy
Wed Feb 12, 2020 8:53 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

Boeing 779 N779XW at GEG https://pbs.twimg.com/media/EQi_BC6XsAUY6_c?format=jpg https://pbs.twimg.com/media/EQi_BD_XsAw4VJH?format=jpg https://twitter.com/Peytonloumar/status/1227440976806936589?s=20 Your GEG pictures are interesting and they show a 777-9 feature I hadn't appreciated before. The in...

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by OldAeroGuy
Tue Feb 11, 2020 6:56 pm
Forum: Technical/Operations
Topic: Strange probes on the A350
Replies: 20
Views: 2881

Re: Strange probes on the A350

I've never seen a RAT test. Just how loud is it? Audible within the cabin/cockpit? From an observer perspective: Would the RAT be the loudest noice emanating on a landing? And while I'm sure this varies by Type, airspeed, etc: What kind of RPM are we talking? Is the RPM governed to an upper-limit? ...

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by OldAeroGuy
Sun Feb 09, 2020 8:49 pm
Forum: Civil Aviation
Topic: UTair 737-500 damaged in hard landing at Usinsk
Replies: 56
Views: 9334

Re: UTair 737-500 damaged in hard landing at Usinsk

According to AVHerald, the aircraft touchdown about 15 meters short of the paved runway. After going through "heaps of snow", the main gear collapsed. http://avherald.com/h?article=4d3110c1&opt=0 With no apparent fuel leakage, it looks like the landing gear fuse pins did their job. A ...

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by OldAeroGuy
Mon Feb 03, 2020 9:33 pm
Forum: Technical/Operations
Topic: One-engine operable climb gradients
Replies: 6
Views: 1330

Re: One-engine operable climb gradients

25.123 is the regulation for the net climb gradient associated with terrain clearance in the cruise configuration. The net climb gradient in the cruise configuration with one engine inoperative and the remaining engine(s) at maximum continuous thrust is the gross climb gradient reduced by: - 1.1% (T...

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by OldAeroGuy
Mon Feb 03, 2020 9:01 pm
Forum: Technical/Operations
Topic: One-engine operable climb gradients
Replies: 6
Views: 1330

Re: One-engine operable climb gradients

There is also the Approach Climb requirement of 25.121(d) Among other specifications: - one engine inoperative - gear up - flap setting stall speed no greater than 110% of the landing flap stall speed - minimum climb gradient of 2.1% (Twin), 2.4% (Tri) or 2.7% Quad Although this is named Approach Cl...

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by OldAeroGuy
Sat Feb 01, 2020 11:46 pm
Forum: Technical/Operations
Topic: Why no Trim Tank in the A350?
Replies: 40
Views: 4407

Re: Why no Trim Tank in the A350?

Given the 747 wing section and planform, the fuel burn advantage was only marginally better than the additional costs for the hardware, software and maintenance needed for CG control. Simplicity won out. The 747 did not use the h.stab fuel for cg control. It could only be filled on the ground and w...

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by OldAeroGuy
Fri Jan 31, 2020 10:01 pm
Forum: Technical/Operations
Topic: Why no Trim Tank in the A350?
Replies: 40
Views: 4407

Re: Why no Trim Tank in the A350?

The 747-400 airfoil is an older technology than the A330's supercritical airfoil and doesn't have the same aft loading. This reduces the advantage of using h. tail fuel to manage CG position. To what status in that domain did they push the revamped wing for the 748 ? Better than the 747-400, worse ...

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by OldAeroGuy
Fri Jan 31, 2020 9:53 pm
Forum: Technical/Operations
Topic: Why no Trim Tank in the A350?
Replies: 40
Views: 4407

Re: Why no Trim Tank in the A350?

I believe a 25% improvement in takeoff performance for h. tail fuel is very optimistic.

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by OldAeroGuy
Fri Jan 31, 2020 9:48 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

Why aren't we getting any more videos of take off/landing??? Also, you got wonder what fuel burn numbers they're seeing. I mean you can model it all day long but real numbers are coming in. Sort of the proof in the pudding as to whether it's a viable frame vs. A35K. They need to expand the envelope...

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by OldAeroGuy
Thu Jan 30, 2020 1:58 pm
Forum: Technical/Operations
Topic: Why no Trim Tank in the A350?
Replies: 40
Views: 4407

Re: Why no Trim Tank in the A350?

Not having h.tail fuel and not using it for CG control if you do, simplifies fuel management. What are the potential savings when using it for CoG control? If the A330 trim tank CG control is inop, fuel burn increases by 1%, so that would seem a reasonable measure of the savings from the system. Th...

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by OldAeroGuy
Thu Jan 30, 2020 1:56 am
Forum: Technical/Operations
Topic: Why no Trim Tank in the A350?
Replies: 40
Views: 4407

Re: Why no Trim Tank in the A350?

Not having h.tail fuel and not using it for CG control if you do, simplifies fuel management. What are the potential savings when using it for CoG control? Given the 747 wing section and planform, the fuel burn advantage was only marginally better than the additional costs for the hardware, softwar...

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by OldAeroGuy
Wed Jan 29, 2020 6:28 pm
Forum: Technical/Operations
Topic: Why no Trim Tank in the A350?
Replies: 40
Views: 4407

Re: Why no Trim Tank in the A350?

Out of curiosity, does the 787 use a trim tank, or cruise flaps? Zeke is correct, the 787 and 777X use variable position cruise flaps to optimize airplane cruise performance. In general, Boeing has not used horizontal tail fuel tanks. The only Boeing transports to use h. tail fuel were the 747-400 ...

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by OldAeroGuy
Sun Jan 26, 2020 4:09 pm
Forum: Civil Aviation
Topic: Boeing 777-9 first flight 25 January 2020
Replies: 970
Views: 82154

Re: Boeing 777-9 first flight 25 January 2020

Jup! Horray for homonyms! MY question actually was if the 9X would be allowed to fly "thumbs up" :-)) No "thumbs up" flying. If the wing tips cannot be extended, the 777X is not flight worthy. What about ferry flight with both tips removed? I guess if things go tech, they can ma...

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by OldAeroGuy
Sun Jan 26, 2020 3:03 pm
Forum: Civil Aviation
Topic: Boeing 777-9 first flight 25 January 2020
Replies: 970
Views: 82154

Re: Boeing 777-9 first flight 25 January 2020

Congratulations to Boeing for this achievement! Great success! My only slight complaint is on aesthetics: I've seen pictures of her before, and with the folded wingtips she looks great. With the wingtips locked down she looks a bit... old style. Like an old 777, not like a modern, efficient and coo...

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by OldAeroGuy
Sun Jan 26, 2020 2:50 pm
Forum: Civil Aviation
Topic: Boeing 777-9 first flight 25 January 2020
Replies: 970
Views: 82154

Re: Boeing 777-9 first flight 25 January 2020

Was it ever made public if stuck up wingtips could be waived for flight? ( then both up, obviously ) I read your comment along the lines of: Was it ever made public if the aircraft waved its wingtips in flight? Would have been a nice gesture for the occasion :D Jup! Horray for homonyms! MY question...

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by OldAeroGuy
Tue Jan 21, 2020 5:43 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing/Production Thread - 2020
Replies: 1835
Views: 367493

Re: Boeing 777X Testing/Production Thread - 2020

I expect there has been some consultation on certain points, but as I understand it, the FAA and EASA accepted each other's certifications generally prima facie . I expect that going forward, a joint certification process will become the standard, out of political necessity if nothing else (now tha...

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by OldAeroGuy
Fri Nov 29, 2019 8:44 pm
Forum: Civil Aviation
Topic: Pictures surfacing of 777X Sept Test Failure
Replies: 308
Views: 62848

Re: Pictures surfacing of 777X Sept Test Failure - they are Bad

The 777 currently has a maximum altitude of 43100 ft, which is a pressure of 2.34 psi in a standard atmosphere, if it maintains a 8000 ft (10.92 psi is the pressure at 8000 ft in a standard atmosphere) cabin at that altitude, the maximum pressure diff is 10.92-2.34=8.58 psi. The maximum diff if the...

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by OldAeroGuy
Fri Oct 11, 2019 3:11 pm
Forum: Civil Aviation
Topic: Boeing examines GEnX powered 767
Replies: 617
Views: 151632

Re: Boeing examines GEnX powered 767

Oh please, that's 1st generation work where super criticality (which is more than just sweep even by your own source) doesn't hold more than 20% the length of the wing. It meets the standard less than half the time. Your statements above show you have no understanding of 757 wing aerodynamics. That...

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by OldAeroGuy
Fri Oct 11, 2019 1:12 pm
Forum: Civil Aviation
Topic: Boeing examines GEnX powered 767
Replies: 617
Views: 151632

Re: Boeing examines GEnX powered 767

The 757 lacks a supercritical wing Where did you get this idea? As a demonstration of 757 wing technology, can you name another airliner with a 0.80M long range cruise speed that has 25 degree sweep wing? You're confused on definitions. Is the Truss-Braced Wing supercritical? No... The 737 MAX's wi...

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by OldAeroGuy
Thu Oct 10, 2019 11:50 pm
Forum: Civil Aviation
Topic: Boeing examines GEnX powered 767
Replies: 617
Views: 151632

Re: Boeing examines GEnX powered 767

patrickjp93 wrote:
The 757 lacks a supercritical wing


Where did you get this idea? As a demonstration of 757 wing technology, can you name another airliner with a 0.80M long range cruise speed that has 25 degree sweep wing?

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by OldAeroGuy
Wed Oct 09, 2019 12:08 am
Forum: Civil Aviation
Topic: Boeing 777X Testing Thread - 2019
Replies: 1441
Views: 380661

Re: Boeing 777X Testing Thread - 2019

Not quick at all. When I was a teenager I read Harry Potter & the Order of the Phoenix in just 14 hours. I've had over a week to read a document half as long by word count. Very admirable. I'm not sure of the relevance though unless it involves testing quidditch capable brooms. The real questio...

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by OldAeroGuy
Tue Oct 08, 2019 7:15 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing Thread - 2019
Replies: 1441
Views: 380661

Re: Boeing 777X Testing Thread - 2019

I didn't advocate taking shortcuts or cutting corners. If it CAN be parallelized (for a reasonable price given the gains), then parallelize it! Manufacturing processes and algorithms are not so different. What leads you to believe this isn't already being done? Have you read AC25-7D yet? It's clear...

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by OldAeroGuy
Tue Oct 08, 2019 4:03 pm
Forum: Civil Aviation
Topic: Boeing 777X Testing Thread - 2019
Replies: 1441
Views: 380661

Re: Boeing 777X Testing Thread - 2019

patrickjp93 wrote:
I didn't advocate taking shortcuts or cutting corners. If it CAN be parallelized (for a reasonable price given the gains), then parallelize it! Manufacturing processes and algorithms are not so different.


What leads you to believe this isn't already being done?

Have you read AC25-7D yet?

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by OldAeroGuy
Thu Oct 03, 2019 3:49 am
Forum: Civil Aviation
Topic: Boeing 777X Testing Thread - 2019
Replies: 1441
Views: 380661

Re: Boeing 777X Testing Thread - 2019

patrickjp93 wrote:
Unless you yourself intend to get down in the mud with the people you disagree with, you have no right to disagree with them. That is the foremost essence of debate and integrity.


Have you read and understood AC25-7D? If you haven't, you're not down in the mud yet.

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by OldAeroGuy
Thu Oct 03, 2019 1:27 am
Forum: Civil Aviation
Topic: Boeing 777X Testing Thread - 2019
Replies: 1441
Views: 380661

Re: Boeing 777X Testing Thread - 2019

Then fire the cruft staff of the FAA and buy more test equipment and pilots or analysts. That's a terrible excuse. The FAA has been certifying craft for 60 years now. Much of this is highly understood and predictable. If you can have 6 craft in the air 7 days a week for a year and not have certific...

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