Search found 3747 matches

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by kalvado
Sun May 08, 2022 11:53 pm
Forum: Technical/Operations
Topic: Double-hinged flap explained or shown??
Replies: 9
Views: 1447

Re: Double-hinged flap explained or shown??

[twoid][/twoid] Thanks to you all for the responses. Do you think a double hinged flap would simply be a duplicated lower hinge or do you think perhaps there would be an upper and lower hinge? Is there an upper hinge on the flaps of the Douglas DC-8? Sorry that I am not very smart abut such things. ...

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by kalvado
Sun May 08, 2022 8:33 pm
Forum: Technical/Operations
Topic: Double-hinged flap explained or shown??
Replies: 9
Views: 1447

Re: Double-hinged flap explained or shown??

As far as I understand, dc-10 has Fowler flaps which pivot on a hinge below lower wing surface. While mechanics is totally unlike flap tracks used on today's A-B jets, surface movement is somewhat similar. There are no slots to be seen, but mechanics looks like that could be incorporated. I can imag...

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by kalvado
Sat May 07, 2022 6:52 pm
Forum: Technical/Operations
Topic: Why do we "check in?"
Replies: 72
Views: 8444

Re: Why do we "check in?"

If you ever flew with connection, you should know that probability of missing the second flight is way above zero. I would say 20%, give or take, from my experience. So check-in data cannot and should not be used for more than preliminary estimate. There's no way 20% of people miss connections. In ...

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by kalvado
Sat May 07, 2022 4:10 pm
Forum: Technical/Operations
Topic: Why do we "check in?"
Replies: 72
Views: 8444

Re: Why do we "check in?"

From check in data you get passenger weights and baggage weights, that is recorded in the system even for connecting passengers. If you ever flew with connection, you should know that probability of missing the second flight is way above zero. I would say 20%, give or take, from my experience. So c...

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by kalvado
Sat May 07, 2022 11:55 am
Forum: Technical/Operations
Topic: Why do we "check in?"
Replies: 72
Views: 8444

Re: Why do we "check in?"

Probably not too much. It should be possible to use tickets sold for draft calculation, and that is all what checkin data would be good for. Now-shows are relatively small %% of sold tickets. Standby/non-revs, misconnects, connecting bags misdirected and/or left behind would be a greater fraction o...

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by kalvado
Fri May 06, 2022 9:59 pm
Forum: Technical/Operations
Topic: Why do we "check in?"
Replies: 72
Views: 8444

Re: Why do we "check in?"

Another reason is performance calculation and weight and balance. Probably not too much. It should be possible to use tickets sold for draft calculation, and that is all what checkin data would be good for. Now-shows are relatively small %% of sold tickets. Standby/non-revs, misconnects, connecting...

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by kalvado
Fri May 06, 2022 1:36 pm
Forum: Technical/Operations
Topic: Why do we "check in?"
Replies: 72
Views: 8444

Re: Why do we "check in?"

Whether we do it in person at the airport, at home on our phones or via an in-airport kiosk, you can't fly until you check in. But why? What mechanisms are set in motion when we "check in"? Or, put another way, what happens if we don't? If you have more than carry on luggage, such as chec...

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by kalvado
Mon Apr 25, 2022 11:30 am
Forum: Technical/Operations
Topic: Horizontal Stabiliser Angle of the Bristol 188
Replies: 8
Views: 1573

Re: Horizontal Stabiliser Angle of the Bristol 188

Isn't tail mounted stabilizer supposed to have negative AoA in level flight in all planes? It is due to stability considerations, what would happen if wing stalls at high AoA, center of gravity vs center of lift, and wing stalls first or stabilizer stalls first, etc. Nose mounted stabilizer may be l...

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by kalvado
Thu Apr 21, 2022 2:53 pm
Forum: Technical/Operations
Topic: airplane gliding
Replies: 43
Views: 5452

Re: airplane gliding

Oh for sure, gliding characteristics of modern airliners is incredible, and with the the altitude they fly, gives them a big advantage over a single engine prop. Modern jetliners like the 777 have at least a 20:1 glide ratio. The 787 glide ratio is supposedly so high it’s proprietary information. I...

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by kalvado
Tue Apr 05, 2022 3:14 pm
Forum: Technical/Operations
Topic: Metric vs Imperial in aircraft
Replies: 43
Views: 6533

Re: Metric vs Imperial in aircraft

M564038 touches on it but doesn’t make part of their point clear. For decades the US Customary Measures as defined by NIST are defined in reference to Metric/SI. So 1 inch is so many millimetres. A pound is so many grams. Basically making the conversions multiplication by various constants. This is...

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by kalvado
Sun Apr 03, 2022 1:34 pm
Forum: Technical/Operations
Topic: Metric vs Imperial in aircraft
Replies: 43
Views: 6533

Re: Metric vs Imperial in aircraft

Small inch threads like 1/8 are taken by pipe threads, and you don't want to add them to the mess. Having NPT 1/4 and 1/4-20 as totally different things is good enough to make things messy. Pipe thread (NPT) has nothing to do with standard UN (Unified National) threads like 1/4-20. UN thread is bas...

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by kalvado
Sun Apr 03, 2022 2:05 am
Forum: Technical/Operations
Topic: Metric vs Imperial in aircraft
Replies: 43
Views: 6533

Re: Metric vs Imperial in aircraft

Well i have this problem. I work now for an EU company that produces machines with some parts made in US. So i have to carry always both toolsets when i have to fix something. Inches and feet are not a problem, but one thing throws me out, and that is gauge of the screws. A 6-32 x 3/8 would be gaug...

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by kalvado
Sat Apr 02, 2022 8:10 am
Forum: Technical/Operations
Topic: Altitude of the static 6g maneuver?
Replies: 13
Views: 2083

Re: Altitude of the static 6g maneuver?

Airliners are usually certified for +2.5/-1gs (this number comes from a regulation as well but I’m too lazy to look up the exact reference now), not to +6. So the test has to be performed up to 2,5 x 1,5 (safety factor) = 3,75g. For obvious safety reasons this test is not performed inflight but on ...

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by kalvado
Thu Mar 24, 2022 3:09 pm
Forum: Technical/Operations
Topic: airplane gliding
Replies: 43
Views: 5452

Re: airplane gliding

There were only few events with dual engine shutdowns, and airplane made it to the ground - some were even flying after that adventure. If you will, this is similar to car running out of gas or suffering engine failure - it is possible to pull over and call for help, but there are many accidents - b...

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by kalvado
Sun Mar 13, 2022 4:27 pm
Forum: Technical/Operations
Topic: Metric vs Imperial in aircraft
Replies: 43
Views: 6533

Re: Metric vs Imperial in aircraft

2. Existing industrial standards - trying to switch to new standards is a massive undertaking. The capital investment in machinery and equipment (sawmills for wood, all manner of fastener production, standard sheetmetal sizes, tubing forms, etc) is enormous and most of that can't simply be reprogra...

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by kalvado
Tue Mar 08, 2022 10:32 pm
Forum: Technical/Operations
Topic: Metric vs Imperial in aircraft
Replies: 43
Views: 6533

Re: Metric vs Imperial in aircraft

Thrusty69 wrote:
My Snap-On 1/2” socket is clearly engraved with “1/2-12.7” right on it. Swear to god. … …

Was it supplied with a bag of M7.8 nuts?

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by kalvado
Mon Mar 07, 2022 7:58 pm
Forum: Technical/Operations
Topic: Cold temperatures and the flight levels
Replies: 7
Views: 2077

Re: Cold temperatures and the flight levels

Basically asking if airplanes flying an IAP have to correct for cold temperatures if marked in the approach chart (and it is cold enough), does something similar apply to the flight levels if the temperature is much colder than usual (i.e., -100 deg F at FL270. Random number) No, while aircraft tru...

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by kalvado
Mon Mar 07, 2022 7:50 pm
Forum: Technical/Operations
Topic: Cold temperatures and the flight levels
Replies: 7
Views: 2077

Re: Cold temperatures and the flight levels

Adiabatic cooling occurs as an aircraft climbs, this is due to the change in pressure. As an aircraft climbs into the flight levels all aircraft use a standardized altimeter setting to ensure separation. As an aircraft descends out of the flight levels local atmospheric pressure, from the arrival a...

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by kalvado
Tue Feb 22, 2022 12:23 pm
Forum: Technical/Operations
Topic: Pneumatic vs Hydraulic
Replies: 35
Views: 3999

Re: Pneumatic vs Hydraulic

Question: Which is more reliable and less prone to leaks .. a hydraulic or pneumatic system running at the same pressure. It might be a hard question to answer since few pneumatic systems run at high pressure. from a molecular perspective my money is on pneumatic being more prone to leak. The molec...

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by kalvado
Tue Feb 22, 2022 2:47 am
Forum: Technical/Operations
Topic: Why didn't the Boeing 707 have rudder problems similar to those of the Boeing 737?
Replies: 37
Views: 7369

Re: Why didn't the Boeing 707 have rudder problems similar to those of the Boeing 737?

That’s a pointless distinction. That actuator wasn’t some off the shelf customer option, but built for, because of, and as an integral non-replacable part of the 737. The issue was with the actuator that Parker built, not the design of the airplane itself. But one that was designed and made by a co...

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by kalvado
Mon Feb 21, 2022 3:58 pm
Forum: Civil Aviation
Topic: AS Groundcrew meltdown at SFO?
Replies: 115
Views: 18030

Re: AS Groundcrew meltdown at SFO?

I could be wrong, but one of the most expensive cities in the world, the requirements of working at an airport , including background checks and the difficulty just getting to work. Either get used to this type of service or rent a private jet ? Would we see ground crews commuting into the airport ...

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by kalvado
Sat Feb 19, 2022 6:10 pm
Forum: Technical/Operations
Topic: Very basic question for pilots: How do airliners slow down when they are already at flight idle?
Replies: 39
Views: 6431

Re: Very basic question for pilots: How do airliners slow down when they are already at flight idle?

With a car it is mainly the friction of the wheels on the road. Do you mean friction in the wheel bearings? Also I think aerodynamic drag on a car is probably the main stopping factor if you're coasting. Wheel friction likely comes from tire and road deformation. At low speed that would be the domi...

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by kalvado
Fri Feb 18, 2022 6:02 pm
Forum: Technical/Operations
Topic: Pneumatic vs Hydraulic
Replies: 35
Views: 3999

Re: Pneumatic vs Hydraulic

Interesting you say that as that's what SpaceX is doing with the Starship - Tesla electric motors powering the grid fins on the booster (That's the goal I believe) and also powering the maneuvering flaperons on the upper stage. Much will depend on weight, if an equivalent electrical landing gear ac...

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by kalvado
Fri Feb 18, 2022 2:56 pm
Forum: Civil Aviation
Topic: FAA administrator Steve Dickson resigns
Replies: 44
Views: 8032

Re: FAA administrator Steve Dickson resigns

I can't speak to other criticisms of Dickson, but the following all fell apart for me when I actually dug into the background of the 5G issue: ...including the recent 5G debacle. ...and the FAA’s role in the 5G debacle factored into his decision. The whole 5G debacle has shown that FAA still needs ...

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by kalvado
Fri Feb 18, 2022 2:15 pm
Forum: Civil Aviation
Topic: FAA administrator Steve Dickson resigns
Replies: 44
Views: 8032

Re: FAA administrator Steve Dickson resigns

I can't speak to other criticisms of Dickson, but the following all fell apart for me when I actually dug into the background of the 5G issue: ...including the recent 5G debacle. ...and the FAA’s role in the 5G debacle factored into his decision. The whole 5G debacle has shown that FAA still needs ...

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by kalvado
Fri Feb 11, 2022 6:57 pm
Forum: Civil Aviation
Topic: Women Removed from AA Flight over Nut Allergy
Replies: 138
Views: 15863

Re: Women Removed from AA Flight over Nut Allergy

Taking this discussion one step further. People are allergic to a wide range of foods, is there a limit on what can be catered. Most foods - nuts included - need actually to be eaten to cause a problem. (or introduced in a similar way to mucus... There is a documented case of death from peanut alle...

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by kalvado
Fri Feb 11, 2022 5:53 pm
Forum: Civil Aviation
Topic: Women Removed from AA Flight over Nut Allergy
Replies: 138
Views: 15863

Re: Women Removed from AA Flight over Nut Allergy

I don't know why we view an allergy as a disability. In this case it's a curable illness; the sufferer can be acclimatized to nuts at least to the point that mere proximity is not dangerous. Broken bone equally can be cured, but I really think someone with a cast on their leg should be treated by t...

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by kalvado
Fri Feb 11, 2022 5:34 pm
Forum: Civil Aviation
Topic: Women Removed from AA Flight over Nut Allergy
Replies: 138
Views: 15863

Re: Women Removed from AA Flight over Nut Allergy

DenverTed wrote:
MIflyer12 wrote:
The DOT has provided guidance.

What is it? Rows or the whole aircraft? Isn't that the crux of this case? Was the woman or AA correctly knowing the guidance?

Looks like neither. Some time to wipe the seat.
Google Department of Transportation Order 2019-5-12

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by kalvado
Fri Feb 11, 2022 5:29 pm
Forum: Civil Aviation
Topic: Women Removed from AA Flight over Nut Allergy
Replies: 138
Views: 15863

Re: Women Removed from AA Flight over Nut Allergy

What I can not understand, how it can be impossible for the people on one flight not to eat nuts on that flight. With respect, you bring this same point up every time this subject comes around, and each time it’s the same response: o People with allergies that severe need to carry an Epi-Pen o It’s...

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by kalvado
Fri Feb 11, 2022 1:46 pm
Forum: Civil Aviation
Topic: Women Removed from AA Flight over Nut Allergy
Replies: 138
Views: 15863

Re: Women Removed from AA Flight over Nut Allergy

Are you a MD specialized in allergies? I have a serious allergie, in this case urticaria with a reaction to protein from the milk of cows. The specialist treating my allergie, explained to me, that to much cow milk as a small child would be the reason I developed this allergie. I was diagnosed at t...

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by kalvado
Thu Feb 10, 2022 12:54 pm
Forum: Civil Aviation
Topic: Women Removed from AA Flight over Nut Allergy
Replies: 138
Views: 15863

Re: Women Removed from AA Flight over Nut Allergy

Looks like this "peanut allergy problem" like the "emotional support animal problem" only occurs in the USA or with passengers from the USA. Are there reports from other countries and continents about problems related to passengers with peanuts allegies in air travel? Never hear...

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by kalvado
Wed Feb 09, 2022 10:22 pm
Forum: Civil Aviation
Topic: Women Removed from AA Flight over Nut Allergy
Replies: 138
Views: 15863

Re: Women Removed from AA Flight over Nut Allergy

I am not a medical professional but I can read. The science says there's no reason to make accomodations for peanut allergy sufferers. They are perfectly safe in an airplane cabin and almost anywhere else. A fine example of accommodating feelings where science knows better. If passengers insist on ...

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by kalvado
Wed Feb 09, 2022 8:29 pm
Forum: Civil Aviation
Topic: Women Removed from AA Flight over Nut Allergy
Replies: 138
Views: 15863

Re: Women Removed from AA Flight over Nut Allergy

She was in economy and they were serving nuts in first class…. This. I'm a food allergy parent too and am pretty sensitive on these things, but the chances of anything airborne migrating from F or J in flight are essentially nil given how air circulation works in flight. But not impossible. Probabi...

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by kalvado
Wed Feb 09, 2022 5:19 pm
Forum: Civil Aviation
Topic: Women Removed from AA Flight over Nut Allergy
Replies: 138
Views: 15863

Re: Women Removed from AA Flight over Nut Allergy

This will be provocative: 14 CFR § 382.5. DOT has openly recognized allergies to be a disability covered by the ACAA. This means that airlines must make accommodations for passengers with allergies so that they can fly as safely on planes as any other passenger. Airlines cannot, however, guarantee ...

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by kalvado
Wed Feb 09, 2022 5:12 pm
Forum: Civil Aviation
Topic: Women Removed from AA Flight over Nut Allergy
Replies: 138
Views: 15863

Re: Women Removed from AA Flight over Nut Allergy

As far as I understand, issue is with people being a bit paranoic - which I can understand given possible consequences. But there is limited actual danger for remote exposure. Someone in a seat next to allergic person is legitimate, even if borderline only. Few rows away shouldn't be an issue https:...

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by kalvado
Wed Feb 09, 2022 4:33 pm
Forum: Technical/Operations
Topic: Tire Pressure on A32X Family
Replies: 9
Views: 2848

Re: Tire Pressure on A32X Family

B777 tire pressures for maximum airplane gross weight in psig (sorted by MTOW): So Boeing also pretty much has the same trend for the family aircraft. Longer the jet, slightly lesser the pressure of the Nose wheel. As a first thought, it may be about lever arm and resulting momentum. Longer arm for...

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by kalvado
Wed Feb 09, 2022 2:20 am
Forum: Technical/Operations
Topic: FAA Draft AC on Flight Path Management
Replies: 13
Views: 2489

Re: FAA Draft AC on Flight Path Management

Something in draft, but working thru the ARC process. Includes this gem, Pilots must have the proficiency to manually fly the aircraft at any time (even for the entire flight), without the aid of automated systems.9 https://www.faa.gov/aircraft/draft_docs/media/afx/AC_120-FPM_Coord_Copy.pdf Bureauc...

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by kalvado
Tue Feb 08, 2022 10:52 pm
Forum: Civil Aviation
Topic: FAA wants to know what actions Airlines are going to do to curb unruly passenger incidents
Replies: 166
Views: 19041

Re: FAA wants to know what actions Airlines are going to do to curb unruly passenger incidents

This is funny on so many levels... Funny - sad, I mean. There are many causes of unruly behavior, including a lack of social skills, lack of accountability for previous poor behavior, alcohol, etc. However, the current rash of bad behavior is largely due to the mask mandates. The question that the ...

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by kalvado
Fri Feb 04, 2022 11:21 pm
Forum: Civil Aviation
Topic: What's next for Mesa - Sea Gliders!
Replies: 10
Views: 1823

Re: What's next for Mesa - Sea Gliders!

viewtopic.php?f=3&t=1460109
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Previous discussion on the subject:
viewtopic.php?f=3&t=1460109

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by kalvado
Mon Jan 31, 2022 7:23 pm
Forum: Technical/Operations
Topic: Avionics Bay Access and Pressurization
Replies: 63
Views: 6117

Re: Avionics Bay Access and Pressurization

If you’re asking about KVA, about 360. There wasn’t IFE on it, some dim lighting and seat belt sign. If it worked a coffee maker and oven up front. Pax got a cold box lunch, so did the crew, but the Loads could awesome with the oven. 360 kVA is a lot; but I suspect that is a total peak power. 787, ...

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by kalvado
Mon Jan 31, 2022 3:51 pm
Forum: Civil Aviation
Topic: Boeing Hints at Next New Jet as It Weighs Tough Engine Decisions
Replies: 115
Views: 19828

Re: Boeing Hints at Next New Jet as It Weighs Tough Engine Decisions

Two possible design challenges with such a design. Where are the gear attached and stowed? Where to place large fuel tanks for +3000nm range? The wings are very thin and dont offer much space for fuel. Edit: If the gear is placed in the engine nacelle, which requires quite a bit larger nacelle than...

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by kalvado
Mon Jan 31, 2022 3:50 pm
Forum: Civil Aviation
Topic: Boeing Hints at Next New Jet as It Weighs Tough Engine Decisions
Replies: 115
Views: 19828

Re: Boeing Hints at Next New Jet as It Weighs Tough Engine Decisions

They appear to continue to be progressing with the Truss Braced Wing Concept. It also opens the door for even larger fans since it is a high wing mounted design https://youtu.be/NtQHjBinQQs This chatter seems to match the NASA timeline https://www.nasa.gov/aeroresearch/nasa-plans-for-subsonic-fligh...

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by kalvado
Mon Jan 31, 2022 2:02 pm
Forum: Civil Aviation
Topic: Boeing Hints at Next New Jet as It Weighs Tough Engine Decisions
Replies: 115
Views: 19828

Re: Boeing Hints at Next New Jet as It Weighs Tough Engine Decisions

They appear to continue to be progressing with the Truss Braced Wing Concept. It also opens the door for even larger fans since it is a high wing mounted design https://youtu.be/NtQHjBinQQs This chatter seems to match the NASA timeline NASA plans to solicit industry in early 2022 for preliminary de...

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by kalvado
Mon Jan 31, 2022 1:10 pm
Forum: Technical/Operations
Topic: Avionics Bay Access and Pressurization
Replies: 63
Views: 6117

Re: Avionics Bay Access and Pressurization

GalaxyFlyer wrote:
The 1970 C-5 needed fewer racks—fewer boxes in the old days

How much power is available for payload on C-5?
I bet passenger cabin requires a bit of power and associated equipment.

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by kalvado
Sun Jan 30, 2022 9:37 pm
Forum: Technical/Operations
Topic: Avionics Bay Access and Pressurization
Replies: 63
Views: 6117

Re: Avionics Bay Access and Pressurization

I have to wonder why large avionics bays haven't gone by the wayside on newer A/C's. No doubt a modern smart phone has more than enough compute power for every system on the aircraft. Not that I'd be advocating for a central controller or anything. I have heard that a lot of the technology is delib...

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by kalvado
Sat Jan 29, 2022 8:07 pm
Forum: Civil Aviation
Topic: Future of US Regional Flying In the Next 5 Years
Replies: 140
Views: 21659

Re: Future of Regional Flying In the Next 5 Years

One of those directions won’t be relaxation of the scope limits. It won’t be a new technology RJ—no business case for it. What can you offer, please? If you want a real flamebait... How about single pilot for E170-195, flying at - or above - 737 CA rate? Then career progression could be 737FO - 737...

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by kalvado
Sat Jan 29, 2022 5:33 pm
Forum: Civil Aviation
Topic: Future of US Regional Flying In the Next 5 Years
Replies: 140
Views: 21659

Re: Future of Regional Flying In the Next 5 Years

Not happening unless another Ch 11 wave hits. Things can come from different directions. People are talking about workforce shortage, and division of first tier mainline vs meager regional is due to availability of cheap workforce. I wouldn't be surprised if things would have to change in multiple ...

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by kalvado
Sat Jan 29, 2022 3:36 pm
Forum: Civil Aviation
Topic: Future of US Regional Flying In the Next 5 Years
Replies: 140
Views: 21659

Re: Future of Regional Flying In the Next 5 Years

Not happening unless another Ch 11 wave hits. Things can come from different directions. People are talking about workforce shortage, and division of first tier mainline vs meager regional is due to availability of cheap workforce. I wouldn't be surprised if things would have to change in multiple ...

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by kalvado
Sat Jan 29, 2022 3:17 pm
Forum: Civil Aviation
Topic: Future of US Regional Flying In the Next 5 Years
Replies: 140
Views: 21659

Re: Future of Regional Flying In the Next 5 Years

The E175 and CR9 are too big for the US market in my opinion, ideally I feel like a jet that fits 6F 70Y would be perfect. I have to ask why, specifically, you think 6F 70Y is better than the 12F 64Y of AA/DL/UA E175s? What I mean is the next generation of Regional Jet needs to be purpose built for...

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