## Search found 2182 matches

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Mon Aug 12, 2019 8:09 pm
Forum: Technical/Operations
Topic: On a "bumpy" approach, how far above and below glideslope are you?
Replies: 4
Views: 1106

### Re: On a "bumpy" approach, how far above and below glideslope are you?

Not much at all if it's just a bit of chop. Consider how much your car shakes when you go over a pothole but you still feel it. Most of the time, it's within a few feet.

Sat Aug 10, 2019 6:20 pm
Forum: Technical/Operations
Topic: Boeing 747 Max Altitude Changes
Replies: 29
Views: 3560

### Re: New queen v old queen max alt

The new wing has less drag, so the emergency decompression descent limited the 748 to F431 from F451, IIRC. It also has a lower MMO of .90 vs .92, but a higher opt mach of .855. Kinda funny how these things work.

Sat Aug 10, 2019 6:13 pm
Forum: Technical/Operations
Topic: Did/Does the 779X need a new wing? and does it need to be so big?
Replies: 47
Views: 6751

### Re: Did/Does the 779X need a new wing? and does it need to be so big?

As the cruise speeds are slower, you can have a thicker wing with less form drag, which means you can make it stronger for a given weight. I once tried to pencil out the cost/benefit of thicker, lighter wings versus higher wing form drag. From those two parameters I couldn't see why every airplane ...

Fri Aug 09, 2019 5:15 pm
Forum: Technical/Operations
Topic: Did/Does the 779X need a new wing? and does it need to be so big?
Replies: 47
Views: 6751

### Re: Did/Does the 779X need a new wing? and does it need to be so big?

Air density = (2 * gravity * wing loading) / ( speed^2 * lift coefficient). This means, assuming a fixed lift coefficient, a lower wing loading allows for a lower air density, and hence a higher altitude. This can be seen when the A380 can cruise at higher altitudes initially than say the 77W. The ...

Fri Aug 09, 2019 4:55 pm
Forum: Technical/Operations
Topic: 787 Core Network (Somewhat) vulnerable
Replies: 6
Views: 1960

### Re: 787 Core Network (Somewhat) vulnerable

https://www.wired.com/story/boeing-787- ... ity-flaws/
-->

Wired's got a story on it as well: https://www.wired.com/story/boeing-787- ... ity-flaws/

Thu Aug 08, 2019 1:11 am
Forum: Travel, Polls & Preferences
Topic: Remaining Pan Am 747 airframes
Replies: 18
Views: 1718

### Re: Remaining Pan Am 747 airframes

The MoF has the prototype, no 121s.... So I'm sure they are mistaken then: https://www.museumofflight.org/aircraft/boeing-747-121 Yeah, it's not the only error they've got. IIRC their VC-137B sign has a picture of a 137C or something like that as well, not to mention the gift shop push-fits that ar...

Wed Aug 07, 2019 7:43 pm
Forum: Travel, Polls & Preferences
Topic: Remaining Pan Am 747 airframes
Replies: 18
Views: 1718

### Re: Remaining Pan Am 747 airframes

SpaceshipDC10 wrote:
acjbbj wrote:
Do you know where the 747-121's that weren't parted out are? Are they still in service?

Pima Air Park and The Museum of Flight.

The MoF has the prototype, no 121s....

Tue Aug 06, 2019 9:43 pm
Forum: Civil Aviation
Topic: LH to announce two new US-routes from MUC
Replies: 200
Views: 38519

### Re: LH to announce two new US-routes from MUC

I could see SEA happening on a 350, maybe later in the day to offer up more connections and to avoid the midday rush. It won't be SJC, because that airport has narrower taxiway clearance, so >200 ft wingspans become an issue.

Fri Aug 02, 2019 8:38 pm
Forum: Technical/Operations
Topic: Was it possible to build the MAX on 757 Platform instead of 737
Replies: 61
Views: 9548

### Re: Was it possible to build the MAX on 757 Platform instead of 737

Orange County (gate cap), Midway (built out), La Guardia (slotted), Reagan (slotted), San Diego (slotted inside of 10), Burbank (gate cap). All constrained. All limited operational capacity airports with short runways or terrain impacted runways. The industry needs a 200 seat plane that serve these...

Thu Aug 01, 2019 3:37 am
Forum: Technical/Operations
Topic: Was it possible to build the MAX on 757 Platform instead of 737
Replies: 61
Views: 9548

### Re: Was it possible to build the MAX on 757 Platform instead of 737

Because that 10% exists, and its usually a constrained airport that needs capacity. I don't follow you. Are you saying a "constrained" airport has shorter runways? Orange County (gate cap), Midway (built out), La Guardia (slotted), Reagan (slotted), San Diego (slotted inside of 10), Burba...

Wed Jul 31, 2019 11:42 pm
Forum: Civil Aviation
Topic: Suspected drunk DL pilot arrested just before flight
Replies: 118
Views: 15380

### Re: DL Pilot Pulled from Flight after Alcohol was found

You must have missed the sarcasm: - DWI: Driving While Intoxicated; - FWI: Flying While Intoxicated. I'd be very surprised if it even exists, but it's the aviation derivative. FAR 91.17... I meant, the term "FWI". 14 CFR 91.17 lays the rules for Drugs & Alcohol, but doesn't use the te...

Wed Jul 31, 2019 6:17 pm
Forum: Civil Aviation
Topic: Suspected drunk DL pilot arrested just before flight
Replies: 118
Views: 15380

### Re: DL Pilot Pulled from Flight after Alcohol was found

FwI btw not dwi Which state? Could be both. In California, making wheels turn even a bicycle, is DWI. Lightsaber You must have missed the sarcasm: - DWI: Driving While Intoxicated; - FWI: Flying While Intoxicated. I'd be very surprised if it even exists, but it's the aviation derivative. FAR 91.17...

Tue Jul 30, 2019 12:17 am
Forum: Technical/Operations
Topic: 777X high lift system
Replies: 20
Views: 2869

### Re: 777X high lift system

OAG, thanks for that explanation, I'd wondered why they had more canoes than other designs.

Mon Jul 29, 2019 5:50 pm
Forum: Civil Aviation
Topic: Airbus airliners name conventions
Replies: 27
Views: 4409

### Re: Airbus airliners name conventions

Yeah, a lot of this was a big mess. One thing to add: on the 330/340, the quad was to launch first, and hence be the 330, but sales told marketing that the quad should be "340," which is why those model numbers were out of sequence. They also skipped the -100, because so many -100 series a...

Sat Jul 20, 2019 4:17 pm
Forum: Technical/Operations
Topic: Did/Does the 779X need a new wing? and does it need to be so big?
Replies: 47
Views: 6751

### Re: Did/Does the 779X need a new wing? and does it need to be so big?

Couple thoughts regarding the "less efficient altitude" idea: 1. The pressure changes will give you a little bit better TAS, but I'm not sure how to model compressibility at transonic speeds and how much of an effect it has 2. The temperature lapse rate stays at roughly 2*/1k feet until ar...

Thu Jul 11, 2019 6:49 pm
Forum: Technical/Operations
Topic: Did/Does the 779X need a new wing? and does it need to be so big?
Replies: 47
Views: 6751

### Re: Did/Does the 779X need a new wing? and does it need to be so big?

LH707330 wrote: Couple questions: 1. Are those fuel burn numbers trip burn or trip burn per pax? Trip fuel burn, its in Kilos LH707330 wrote: If it isn't normalized, then you get 410/365=1.12, so 12% more pax for free. Add that to the 10% SFC gain, and you're about in the right ballpark. Fuel burn ...

Wed Jul 10, 2019 10:51 pm
Forum: Technical/Operations
Topic: Did/Does the 779X need a new wing? and does it need to be so big?
Replies: 47
Views: 6751

### Re: Did/Does the 779X need a new wing? and does it need to be so big?

Couple questions: 1. Are those fuel burn numbers trip burn or trip burn per pax? If it isn't normalized, then you get 410/365=1.12, so 12% more pax for free. Add that to the 10% SFC gain, and you're about in the right ballpark. 2. How are you modeling takeoff performance? If you remove 13t in DOW to...

Mon Jul 08, 2019 6:59 pm
Forum: Civil Aviation
Topic: Why no IAE engine options for A320 NEO?
Replies: 7
Views: 2239

### Re: Why no IAE engine options for A320 NEO?

One issue that the V2500 team ran into with their ownership split is that nobody really "owned" it in terms of having enough skin in the game to implement PIPs for a while. One reason PW bought out RR was to address that. On the PW1000-JM, JAE and MTU are still major players, but PW is QBi...

Mon Jul 01, 2019 7:43 pm
Forum: Technical/Operations
Topic: Do pilots always understand ATC?
Replies: 39
Views: 7270

### Re: Do pilots always understand ATC?

There are a lot of local VFR procedures in my area that are not published outside of the airport website, so you'll sometimes hear unfamiliar pilots ask "what's that arrival?" and then tower explains it.

Wed Jun 26, 2019 7:07 pm
Forum: Technical/Operations
Topic: Why did DL remove Winglets on some of their 757 fleet?
Replies: 17
Views: 4805

### Re: Why did DL remove Winglets on some of their 757 fleet?

Were any of the 757's delivered from Boeing with winglets? MY guess is that more likely, winglets were added after delivery by Aviation Partners Boeing STC's. I was working at Boeing as an Airworthiness Inspector until about 1999-2000 and don't recall seeing any 757 delivered with winglets. IDK abo...

Tue Jun 18, 2019 9:50 pm
Forum: Civil Aviation
Topic: 747 Classic B Variants
Replies: 41
Views: 4711

### Re: 747 Classic B Variants

747B was a designation first used in the late-1960s to market increase gross weight versions of the 747. There were to be passenger 747Bs, Convertible freighters, and pure freighter 747Bs. Here is a 2-page magazine ad for the convertible and freighter versions of the 747B for sale on EBay from 1969...

Tue Jun 18, 2019 6:51 pm
Forum: Technical/Operations
Topic: Increased commercial traffic and existing airspace
Replies: 2
Views: 959

### Re: Increased commercial traffic and existing airspace

Not too much. From my experience, departure sends the Paine traffic east or west pretty soon after departure to avoid conflicts. Check out some of the FR24 tracks and altitudes to get an idea.

Tue Jun 18, 2019 2:39 am
Forum: Civil Aviation
Topic: Business Risk for Boeing: The A321XLR
Replies: 409
Views: 45791

### Re: Business Risk for Boeing: The A321XLR

From what I've seen, Boeing is aiming at the 763ER payload/range segment, and needs to figure out if such a right-sized plane will sell enough units at the price point airlines are willing to pay in order to warrant the investment. I agree that many make that argument. My problem with that is: 767-...

Mon Jun 17, 2019 5:22 pm
Forum: Civil Aviation
Topic: Business Risk for Boeing: The A321XLR
Replies: 409
Views: 45791

### Re: Business Risk for Boeing: The A321XLR

I suppose the two questions are.... (1) If either Boeing or Airbus were to design the perfect widebody to compete with the narrowbodies in terms of range*, how much better would the seat-mile costs be? *so <~5000nm at whatever capacity is optimal for their solution - which would have to include gat...

Mon Jun 17, 2019 3:27 am
Forum: Civil Aviation
Topic: F50 Questions
Replies: 48
Views: 7163

### Re: F50 Questions

Well, it was at least 117, that's only the tailwind component. If it was coming from an offset angle, then it could have been even stronger over the ground.

Fri Jun 14, 2019 8:19 pm
Forum: Civil Aviation
Topic: F50 Questions
Replies: 48
Views: 7163

### Re: F50 Questions

So I want to clear this up: 1. On a still day where there is no wind...TAS and GSPD (Ground Speed) are the same? 2. If an F50 is doing 270 knots TAS, but there is a tail wind of 30 knots..the GSPD is 300 knots? 3. Which would mean if the F50 was doing 270 knots TAS but there was a head wind of 30 k...

Fri Jun 14, 2019 7:17 pm
Forum: Civil Aviation
Topic: Updated: Qantas saying it is almost ready to select Project Sunrise aircraft
Replies: 1483
Views: 269213

### Re: Updated: Qantas saying it is almost ready to select Project Sunrise aircraft

It nearly could. The biggest problem is the 787-9 hits maximum fuel capacity at exactly 8200nm. So it can not use any of that extra MTOW increase for fuel without an aux fuel tank. Now with the 777LR and A350-900 ACAP documents when you add an aux fuel tank it extended the upper first line and elim...

Fri Jun 14, 2019 6:08 pm
Forum: Civil Aviation
Topic: First 777-9 for Lufthansa rolls out of final assembly
Replies: 38
Views: 11654

### Re: First 777-9 for Lufthansa rolls out of final assembly

Psolk makes a good point, despite all the noise made over folding wingtips, the amount of wing folded up is tiny. It looks much more impressive in person. It's actually quite a decent chunk of wing. I can't wait to see the wing in full. I never liked the 773/77W as I felt it was anorexic looking bu...

Thu Jun 13, 2019 9:24 pm
Forum: Civil Aviation
Topic: 747 Classic B Variants
Replies: 41
Views: 4711

### Re: 747 Classic B Variants

It was my understanding the upper decks of the -100 and -200 had the same surface area, but the latter had more windows. The -300 was the first lengthened upper deck. I did a little research and this is correct, it just looks longer. There where some ‘SUD’ versions of the -200’s, these had also the...

Thu Jun 06, 2019 11:54 pm
Forum: Technical/Operations
Topic: Pilot Expense Policies
Replies: 36
Views: 4557

### Re: Pilot Expense Policies

dennypayne wrote:
e38 wrote:
The hotels are generally very nice--Sheraton, Westin, Hilton, Doubletree, Hyatt, Crown Plaza, etc.

Do crews get to accrue and keep any hotel loyalty points from these stays?

Sent from my SM-G950U using Tapatalk

You'd be a fool not to sign up IMHO. Why would the airline care?

Wed Jun 05, 2019 5:31 pm
Forum: Civil Aviation
Topic: United ORD-LAX on June 5th, 2019: Completely on Biofuel
Replies: 33
Views: 4760

### Re: United ORD-LAX tomorrow: completely on biofuel

Fossil fuel energy density -- it's why internal combustion still dominates; along with a very well developed exploration, refining, and distribution network. It's going to take something much better to overcome that advantage, and it's not going to come from biofuels. I think you mean hydrocarbons,...

Tue Jun 04, 2019 10:57 pm
Forum: Civil Aviation
Topic: How did Airlines Fill up Large Widebodies in the Old days?
Replies: 119
Views: 23158

### Re: How did Airlines Fill up Large Widebodies in the Old days?

Another thing that I'm surprised no one has mentioned is that the narrowbodies of the '70's did not have the range that they do today. The old 737-200s and 727-200s could only fly about 1400 miles if full. Thus, if an airline wanted to do a trans-con or something almost trans-con, you needed a DC10...

Mon Jun 03, 2019 6:01 pm
Forum: Technical/Operations
Topic: Can a lesser-range airplane be reconfigured to get ULH?
Replies: 13
Views: 1586

### Re: Can a lesser-range airplane be reconfigured to get ULH?

Don't think so. At least with Singapore, they had the A340s as all business class, much like British Airways with their A318s out of London City to New York. You can get a lot of range just by severely limiting payload. Even an A330 has a fuel capacity of around 109 tons, meaning that on full tanks...

Wed May 29, 2019 10:52 pm
Forum: Civil Aviation
Topic: Airbus A320ceo Family Production/Delivery Thread - 2019
Replies: 61
Views: 12265

### Re: Airbus A320ceo Family Production/Delivery Thread - 2019

lightsaber wrote:
NeBaNi wrote:
LH707330 wrote:
the ones with tortilla chips

I lol'd at this
.... also made me kinda hungry

I'm describing all CEO as Tortilla chip aircraft. Wing fences is so engineering.

I've always referred to them as tortilla chips, glad I could amuse you both.

Wed May 29, 2019 10:48 pm
Forum: Technical/Operations
Topic: PW6000, CFM56-5A/B, LEAP-1A, PW1100G - How to distinguish them?
Replies: 5
Views: 1276

### Re: PW6000, CFM56-5A/B, LEAP-1A, PW1100G - How to distinguish them?

Integrated mixer/full-length nacelle: PW6000 or IAE V2500. The 2500 is a bigger engine, but you can look at the plane length to know which one it is (318->PW, 319/20/21->2500). Short duct, no cone in exhaust: CFM56-5 (the 5B is slightly longer, but it's hard to see) Big fan and BP duct, cone in exha...

Tue May 28, 2019 8:42 pm
Forum: Civil Aviation
Topic: Airbus A320ceo Family Production/Delivery Thread - 2019
Replies: 61
Views: 12265

### Re: Airbus A320ceo Family Production/Delivery Thread - 2019

Why are they still making the ones with tortilla chips for Peach?

Tue May 28, 2019 8:37 pm
Forum: Civil Aviation
Topic: Airbus 50 Years Celebration - 5 things Airbus got right and 5 it did not
Replies: 83
Views: 12543

### Re: Airbus 50 Years Celebration - 5 things Airbus got right and 5 it did not

Another early mistake was in reducing the fuselage diameter of the A300 in panicked response to a dip in passenger numbers. Originally it was wider than the 777! It turned-out that the fall-off was short-term, but Airbus was stuck with the narrower fuselage all the way to the A340-600. The A330 / 3...

Sun May 26, 2019 5:34 pm
Forum: Civil Aviation
Topic: Updated: Qantas saying it is almost ready to select Project Sunrise aircraft
Replies: 1483
Views: 269213

### Re: Updated: Qantas saying it is almost ready to select Project Sunrise aircraft

Does Singapore use their A359ULR aircraft for anything other than long haul, filling in on regional routes ? The singapore ULR aircraft only do long haul with zero regional work. The Airbus guys are simply trying to justify why Qantas should purchase the A350-1000. The only reason an aircraft might...

Sun May 26, 2019 5:14 pm
Forum: Civil Aviation
Topic: AA191 40 Year Anniversary coming up
Replies: 155
Views: 19052

### Re: AA191 40 Year Anniversary coming up

The foreground picture is definitely a DC-8.

1. The flaps are slightly extended, and don't show the thrust gate that the 707s have.
2. The inboard engines are closer in, a telltale DC-8 attribute.
3. There's a pretty pronounced nose-down deck angle, whereas the 707s are almost level

Sat May 25, 2019 8:09 pm
Forum: Travel, Polls & Preferences
Topic: Your longest & shortest flights
Replies: 78
Views: 4147

### Re: Your longest & shortest flights

Shortest: YVR-SEA, 127 miles, 45 mins
Longest: SFO-SIN, 8446 miles, 16:45 air time

Sat May 25, 2019 7:46 pm
Forum: Civil Aviation
Topic: AA191 40 Year Anniversary coming up
Replies: 155
Views: 19052

### Re: AA191 40 Year Anniversary coming up

The crash was caused by improper maintenance, pure and simple. Yes, you are correct. AA should not have gone cheap and used a forklift to remove engines. But after the fact, it was possible for the pilots to save the aircraft. They did themselves no favor pulling back on thrust as trained with a lo...

Fri May 24, 2019 6:08 pm
Forum: Civil Aviation
Topic: First Delta A330neo & Etihad A350-1000 Spotted Flying
Replies: 44
Views: 10612

### Re: First Delta A330neo & Etihad A350-1000 Spotted Flying

A330 looks a bit dated , A350 looks really good and elegant and that size is appropriate much like A321. If I was running an airline , it would be an easy choice I can see how the A330ceo looks a bit dated, but the A330neo I think looks very modern and A350/B787-like with the bigger engines and new...

Fri May 24, 2019 4:21 pm
Forum: Civil Aviation
Topic: SEA IAF update and Ed Bastian comments
Replies: 63
Views: 9464

### Re: SEA IAF update and Ed Bastian comments

I have not heard the 250-300 daily flights numbers before. Last I heard was around 200 flights. 200-225 seems pretty attainable with the "CANNABUS" joining the fleet and all the markets like DFW, DAL, IAH, MCI, STL, OMA, ABQ, and more that those aircraft can serve from SEA. The "cann...

Tue May 21, 2019 4:30 pm
Forum: Civil Aviation
Topic: New Greater Seattle Airport
Replies: 111
Views: 11794

### Re: New Greater Seattle Airport

From my understanding, the major constraint is gate space, although I have seen some pretty long conga lines for takeoff a number of times. Adding some gates, or maybe moving the regional aircraft to remote stands and reconfiguring that central terminal area to accommodate upgauged aircraft would li...

Mon May 20, 2019 4:55 pm
Forum: Technical/Operations
Topic: 737 derated takeoff power question
Replies: 26
Views: 3820

### Re: 737 derated takeoff power question

Technically, "thrust lever" makes more sense (although why "lever" and not "handle?" I think a lot of it could just be nomenclature history and regional differences, same way we got cockpit/flightdeck, reheat/afterburner, etc.

Fri May 17, 2019 5:33 pm
Forum: Civil Aviation
Topic: Updated: Qantas saying it is almost ready to select Project Sunrise aircraft
Replies: 1483
Views: 269213

### Re: Updated: Qantas saying it is almost ready to select Project Sunrise aircraft

That's like a wet dream for for us avgeeks. I wonder what a 200 seat A338 is capable of @ 251t Fred A fair amount I would think - but not as much as a 254t 787-8ER I suspect. Now if we want to start talking about a 280t A350-800LR ..... :) Rgds What about a 275t A338LR? Give it the centre gear of t...

Thu May 16, 2019 10:52 pm
Forum: Non-Aviation
Topic: Climate Change - Is aviation heading for a slump?
Replies: 96
Views: 9468

### Re: Climate Change - Is aviation heading for a slump?

Wouldn't a better near term technology be using Renewables to make Liquid Hydrogen and use that to fuel planes? Wouldn't that be a better (lighter) energy storage solution? It would require totally new designs - but it could work for the short range at least. I was going to bring this up as well. I...

Thu May 16, 2019 6:06 pm
Forum: Non-Aviation
Topic: Climate Change - Is aviation heading for a slump?
Replies: 96
Views: 9468

### Re: Climate Change - Is aviation heading for a slump?

This isn't a climate change debate, it's a discussion on whether possible climate change may impact aviation. If this turns into a non aviation debate over the existence of climate change, the thread will be locked, and users may be warned or banned for not staying on topic. Let's not forget that t...

Sun May 12, 2019 3:30 am
Forum: Technical/Operations
Topic: Delta 767 Engine Question
Replies: 5
Views: 1806

### Re: Delta 767 Engine Question

They both have similar fuel burn performance, IIRC the PW are better out of the box, and the GE retain performance longer. The GE birds in the DL fleet are newer, that may have something to do with it.

Thu May 09, 2019 12:59 am
Forum: Civil Aviation
Topic: Boeing 767: Fuselage size always limited profitability??
Replies: 85
Views: 10351

### Re: Boeing 767: Fuselage size always limited profitability??

Great analogy. Everything is cost based. IMHO, everything must go to CFRP wings as underside laminar flow is easier and the weight savings. The botched 787 EIS scared designs away from CFRP. Now it is the going forward, except for low production volumes (business jets). Airlines expand if they pick...

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