Search found 102 matches

by hitower3
Thu Aug 15, 2019 9:08 am
Forum: Civil Aviation
Topic: Ural Airlines A321 VQ-BOZ 15 august 2019 Moscow emergency landing
Replies: 177
Views: 26192

Re: Ural Airlines A321 VQ-BOZ 15 august 2019 Moscow emergency landing

Dear A-netters, I would have a question related to the envelope protection system of the A320 series in this situation (double engine failure): What flight mode will be active if both engines will fail, causing also a failure of both green and yellow hyd systems? Would it stay in normal, degrade to ...

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by hitower3
Wed Jul 31, 2019 12:40 pm
Forum: Technical/Operations
Topic: 777X high lift system
Replies: 20
Views: 2906

Re: 777X high lift system

(...) On ailerons - the stiffer Airbus wings allow just out board devices as you do not get roll reversal. The Boeing wing has both outboard and the flaperon inboard because of the potential for roll reversal. Dear StTim, I have one question about "roll reversal" and the need for inbord a...

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by hitower3
Tue Jul 30, 2019 1:19 pm
Forum: Civil Aviation
Topic: Boeing 797 Thread - 2019
Replies: 1256
Views: 170842

Re: Boeing 797 Thread - 2019

Dear a.netters, There seems to be a heated debate about the proper assessment of seating capacity of airliners, mainly fueled by the fact that there isn't a unique way to configure seats on a plane. May I kindly suggest that we should use the unit of cabin space in m² for our comparisons? This woul...

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by hitower3
Tue Jul 30, 2019 10:34 am
Forum: Civil Aviation
Topic: Boeing 797 Thread - 2019
Replies: 1256
Views: 170842

Re: Boeing 797 Thread - 2019

Dear a.netters, There seems to be a heated debate about the proper assessment of seating capacity of airliners, mainly fueled by the fact that there isn't a unique way to configure seats on a plane. May I kindly suggest that we should use the unit of cabin space in m² for our comparisons? This would...

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by hitower3
Tue Jul 30, 2019 9:34 am
Forum: Technical/Operations
Topic: 777X high lift system
Replies: 20
Views: 2906

Re: 777X high lift system

There must be significant benefit to the 777X to split the outer flaps into two sections - adding additional flap tracks is not good for the overall aerodynamics so the benefit must be somewhere.... Dear StTim, I could imagine that the splitting of aerodynamic devices on wings (slats, flaps, ailero...

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by hitower3
Tue Jul 30, 2019 9:11 am
Forum: Technical/Operations
Topic: 777X high lift system
Replies: 20
Views: 2906

Re: 777X high lift system

[quote="Armadillo1"]can you appoint me inboard aileron on this picture? Dear Armadillo, I could guess that he meant that the ailerons on the A350 are split. Of course, both of these ailerons (two on each side) are located outside of the outer flaps, so it's a very different design than the...

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by hitower3
Mon Jul 29, 2019 3:12 pm
Forum: Civil Aviation
Topic: Airbus airliners name conventions
Replies: 27
Views: 4414

Re: Airbus airliners name conventions

Hello, For a bit of historical context: the Airbus project initially settled on the "A300" designation, where the number "300" represented the intended passenger capacity. Likewise, the shortened version of the A300 was to be called "A250". For reasons unknown to me, th...

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by hitower3
Mon Jul 01, 2019 3:12 pm
Forum: Technical/Operations
Topic: Weight cost of pressurised cabin
Replies: 12
Views: 3197

Re: Weight cost of pressurised cabin

Fun fact : The mass of the air added through the pressurisation adds up to a few 100kg in a large commercial jet.

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by hitower3
Tue Jun 18, 2019 10:51 am
Forum: Civil Aviation
Topic: Airbus a330-900 460 seats
Replies: 75
Views: 11268

Re: Airbus a330-900 460 seats

Holy moly, they are taking "high density" to new levels.
On the other end of the scale, you can find Swiss who configures the A330-300 with 219 seats - less than half!
Hendric

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by hitower3
Mon Jun 17, 2019 11:21 am
Forum: Civil Aviation
Topic: Paris Air Show 2019: Airbus News and Orders Thread
Replies: 475
Views: 124574

Re: Paris Air Show 2019: Airbus News and Orders Thread

Armadillo1 wrote:
https://www.airbus.com/aircraft/passenger-aircraft/a320-family/a321neo.html#a321xlr
what is a "water volume"?


I read it as "if you would pour water into the cargo hold, you would need 59m³ to completely fill it". This indicates the gross volume of the hold.

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by hitower3
Mon Jun 17, 2019 11:19 am
Forum: Civil Aviation
Topic: Paris Air Show 2019: Airbus News and Orders Thread
Replies: 475
Views: 124574

Re: Paris Air Show 2019: Airbus News and Orders Thread

Have they clarified what the "modified landing gear" is? I don't have any information suggesting a major re-design - like a "telescope-style" or double-bogey gear (as it was used on some early 320s for Air India). I suspect it's merely a reinforced version allowing to handle the...

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by hitower3
Mon Jun 17, 2019 8:17 am
Forum: Civil Aviation
Topic: Last commercial CFM-56-7B delivered
Replies: 16
Views: 3336

Re: Last commercial CFM-56-7B delivered

afterburner wrote:
OP wrote a list of aircraft that are powered by previous versions of CFM56. I just added A340-200/300 to the list.


Hello,
In this case, may I also add the DC8-70 series and the KC-135? :-)
Hendric

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by hitower3
Fri Jun 14, 2019 9:07 am
Forum: Technical/Operations
Topic: Landing fees in special cases
Replies: 13
Views: 2030

Re: Landing fees in special cases

As stated in other posts this can vary from airport to airport and country to country. In general the following applies to larger airports in the US. Go around/balked landings, only one landing fee no matter how many attempts. Approach to airport A then divert to airport B. Only airport B will get ...

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by hitower3
Wed Jun 12, 2019 8:45 am
Forum: Technical/Operations
Topic: Landing fees in special cases
Replies: 13
Views: 2030

Landing fees in special cases

Dear a.netters, I would like to ask a few questions about landing fees in special/abnormal scenarios. In normal operations, things are quite clear to me: When you land an airoplane at the destination airport, you'vo got to pay the landing fee. Now, what happens in a few special / abnormal operation ...

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by hitower3
Wed Jun 12, 2019 8:31 am
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 384
Views: 74894

Re: 787 vs A350 range

There is reportedly up to 300kg per hour fuel burn difference between older a350-900s and the newest ones with larger winglets (and other mods) for similar payloads and trip lengths. Dear xwb565, This 300kg figure would mean a 5.5% difference between "old" and newer 350-900s - this sounds...

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by hitower3
Wed May 29, 2019 8:59 pm
Forum: Travel, Polls & Preferences
Topic: Best Airline Ads
Replies: 59
Views: 3205

Re: Best Airline Ads

My favourite for the last few years is the one from Lufthansa - "Flying with the Germans?"
https://www.youtube.com/watch?v=fOBVCGRYCyE

Hendric

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by hitower3
Tue May 28, 2019 2:47 pm
Forum: Civil Aviation
Topic: Oldest LH Airbus 320 last flight today
Replies: 54
Views: 9247

Re: Oldest LH Airbus 320 last flight today

Fun facts: At the time this aircraft was built - The Berlin wall was still erect (and would fall only 3 months later) - There was no WWW. The first WWW server would go online 2 years later (CERN). - World population was approx. 5.2 billion. We are standing at 7.7 billion at time of this writing. - T...

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by hitower3
Thu Apr 18, 2019 11:00 am
Forum: Civil Aviation
Topic: Owl found resting in Virgin 737 engine at SYD
Replies: 54
Views: 10100

Re: Owl found resting in Virgin 737 engine at SYD

Owly moly, how lucky that they found that bird before engine startup!

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by hitower3
Wed Apr 10, 2019 8:27 am
Forum: Technical/Operations
Topic: Why do MD-80s lock their horizontal stabilizer in an upright position at the gate?
Replies: 24
Views: 4060

Re: Why do MD-80s lock their horizontal stabilizer in an upright position at the gate?

Correct the elevator on the DC9/MD80/90/717 is a floating elevator.The control cables from the the flight deck are connected to a small control tab on the trailing edge of the elevator. The pilots move the tab and essentially fly the elevator to the required position. Douglas did this so they would...

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by hitower3
Wed Apr 10, 2019 8:21 am
Forum: Technical/Operations
Topic: The Electric Beaver
Replies: 17
Views: 1927

Re: The Electric Beaver

(...) If we put everyone on the grid, has anyone come up with a practical plan to provide the electricity? As it is right now, 63% of electrical power in the U.S. is from fossil fuel powered power plants. Unless we go to nuclear, none of the alternatives to fossil fuel are viable. Dear stratclub, I...

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by hitower3
Sat Mar 16, 2019 12:54 pm
Forum: Technical/Operations
Topic: Why is the A330 still 8 abreast?
Replies: 26
Views: 3928

Re: Why is the A330 still 8 abreast?

The original fuselage design for the A300 was 6.4 metres in diameter for nine or ten abreast, to permit through-ticketing with the 747 without reseating. Sadly there was a bit of a market downturn and the partners panicked that they were 'oversizing' so shrank it down to 5.64 metres for the A300B. ...

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by hitower3
Thu Mar 14, 2019 1:16 pm
Forum: Technical/Operations
Topic: Auto Stall Prevention System on 737 Max
Replies: 33
Views: 4323

Re: Auto Stall Prevention System on 737 Max

A Cessna 172 when stalled, the nose pitches down and the stall warning indicator sounds. This doesn’t happen in an Airbus 320. When the 320 stalls there is no nose pitch down moment indicating a full stall. It just mushes and starts “falling out of the sky” in a nose level wings level attitude. The...

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by hitower3
Thu Mar 14, 2019 1:01 pm
Forum: Technical/Operations
Topic: 767 Fuel Burn Question
Replies: 4
Views: 1291

Re: 767 Fuel Burn Question

Hello, There will be a slight trip fuel burn advantage for the 762ER, this advantage may shrink on very long missions. The total cost of ownership will be significantly lower on a 762, as they are much older. You just need to find one, many of them being gone already. When it comes to winglets, the ...

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by hitower3
Wed Mar 13, 2019 2:05 pm
Forum: Civil Aviation
Topic: LH orders 20 B789 and 20 additional A350; Will sell 6 A380s back to Airbus
Replies: 351
Views: 54359

Re: LH orders 20 B789 and 20 additional A350; Will sell 6 A380s back to Airbus

The legend says that the A380 has way better economics than the B748 ,how comes LH are getting rid of the whale and keeping the queen ? While I don't have the official answer, my guess would be cargo capability. The 748 is great for carrying lower deck cargo in addition to pax, the A388 not so much...

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by hitower3
Wed Mar 13, 2019 2:02 pm
Forum: Civil Aviation
Topic: LH orders 20 B789 and 20 additional A350; Will sell 6 A380s back to Airbus
Replies: 351
Views: 54359

Re: LH orders 20 B789 and 20 additional A350; Will sell 6 A380s back to Airbus

Regarding LX: The replacement of the A333 is due for 2030+. They need an imminent replacement for the A343 from 2025 onwards. So my guess is they will get A359 to operate it next to the A333. B789 doesn't make sense at the current stage. They could also replace all 5 A343s and 14 A333s with the 20 ...

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by hitower3
Wed Mar 13, 2019 1:58 pm
Forum: Civil Aviation
Topic: LH orders 20 B789 and 20 additional A350; Will sell 6 A380s back to Airbus
Replies: 351
Views: 54359

Re: LH orders 20 B789 and 20 additional A350; Will sell 6 A380s back to Airbus

Are the 789 for Swiss? I would say that at least a part of that order will end up to replace 6x763ER and 6x772ER at Austrian, as their fleet is in the most urgent need for replacement. Swiss has a brand new subfleet of 77W (2 more coming soon for a total of 12), a reasonably new fleet of A333 and 5...

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by hitower3
Wed Mar 13, 2019 11:33 am
Forum: Technical/Operations
Topic: Cockpit assistance with landing
Replies: 8
Views: 1519

Re: landing

Dear Vinicium, While pilots can land an aircraft (from ultralight to A380) fully visual and flying it by hand, there are many kinds of assistance systems available, for example: - ILS - a radio based system that guides the pilot to a correct landing course and glideslope, even in poor visibility. - ...

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by hitower3
Wed Mar 13, 2019 9:09 am
Forum: Civil Aviation
Topic: Atlas Air 3591 Down in Trinity Bay, Texas
Replies: 1727
Views: 387496

Re: Atlas Air 3591 Down in Trinity Bay, Texas

One question: Would it be theoretically conceivable that wing icing might have played a role in this occurrence?

Hendric

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by hitower3
Mon Mar 11, 2019 1:54 pm
Forum: Technical/Operations
Topic: Why is the A330 still 8 abreast?
Replies: 26
Views: 3928

Re: Why is the A330 still 8 abreast?

Interesting side note: I have early documents from 1972 about the then-new A300 project. The cabin mock-up included therein shows both 2-4-2 and 3-3-3 layouts for the economy cabin.
So, squeezing more people in the original Airbus widebody design is a fairly old concept...

Hendric

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by hitower3
Mon Mar 11, 2019 12:39 pm
Forum: Technical/Operations
Topic: Are there AoA sensors made of tubular spirit levels?
Replies: 34
Views: 2333

Re: Are there AoA sensors made of tubular spirit levels?

The A350 uses three multifunction probes that combine pitot, AoA and TAT detection to feed the three primary air data systems, labeled "2" in the pic. Additionally, there is a standby AoA sensor, labeled "7", a standby pitot, labeled "6" and two OAT probes, labeled &qu...

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by hitower3
Fri Mar 01, 2019 11:37 am
Forum: Technical/Operations
Topic: A300 NO SLAT LANDING
Replies: 2
Views: 1268

Re: A300 NO SLAT LANDING

The A300 could indeed take off without flaps, but in every case the slats would be deployed. For landings, both slats and flaps would normally need to be deployed. If the slats are inop - e.g. because of a system failure - QRH procedure must be followed which requires a higher approach speed. The A3...

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by hitower3
Tue Feb 26, 2019 11:00 am
Forum: Civil Aviation
Topic: OS retro livery?
Replies: 28
Views: 4222

Re: OS retro livery?

There was a joke back in the 1990's about the national carriers of Switzerland and Austria: Where Swissair has a "plus", Austrian has a "minus" on its tail...

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by hitower3
Sun Feb 24, 2019 11:52 am
Forum: Technical/Operations
Topic: Airbus a359, A339 and Boeing 787 great circle length mission optimization?
Replies: 3
Views: 2221

Re: Airbus a359, A339 and Boeing 787 great circle length mission optimization?

Dear GalebG4, I hope I have got your question right, please disregard if I misunderstood you. The best way to assess the optimum mission profile for a given aircraft is to have a look at the payload-range chart. The first point that is of relevance for the performance assessment is the first kink in...

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by hitower3
Thu Feb 21, 2019 3:15 pm
Forum: Travel, Polls & Preferences
Topic: Airports with approaches in close proximity to city centers
Replies: 112
Views: 8894

Re: Airports with approaches in close proximity to city centers

I would throw in my home airport of Vienna, Austria (LOWW/VIE). If rwy. 11 is used for landings - that happens at times - you will enjoy a beautiful approach right over Schönbrunn castle.
Fortunately for the habitants, most approaches are carried out towards rwys 16/34 or at night on 29.

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by hitower3
Thu Feb 21, 2019 11:52 am
Forum: Civil Aviation
Topic: Remaining DC-9 operators (DC-9-14 to DC-9-51)
Replies: 32
Views: 4627

Re: Remaining DC-9 operators (DC-9-14 to DC-9-51)

That's interesting, I wonder what the advantage is over a (737)-500 or -600. Does the JT8D make that big a difference? Dear DeltaDart, The JT8D used on the 737-200 has got a significantly smaller fan diameter than the CFM56 on the later generations. This increases the ground clearance to reduce the...

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by hitower3
Thu Feb 21, 2019 11:01 am
Forum: Technical/Operations
Topic: 747-400 vs. 747-8 undercarriage
Replies: 11
Views: 2451

Re: 747-400 vs. 747-8 undercarriage

Someone correct me, but I think this is how they're set up: 100: 46" front and rear (commonality with the 707) 200/300: 48" front and rear 400: 50" front and rear 400ER: 50" front, 51" rear -8: 50" front, 52" rear Very interesting, thank you for the detailed answer!

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by hitower3
Wed Feb 20, 2019 9:10 am
Forum: Technical/Operations
Topic: 747-400 vs. 747-8 undercarriage
Replies: 11
Views: 2451

Re: 747-400 vs. 747-8 undercarriage

Interesting!
May I chime in with another question: I once heard that the 747 would use the same tires on the nose landing gear as on MLG, is this correct? And is this still correct on the -8?

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by hitower3
Mon Feb 18, 2019 8:21 am
Forum: Civil Aviation
Topic: Swissair 111 crash 20 years ago
Replies: 73
Views: 17723

Re: Swissair 111 crash 20 years ago

1989worstyear wrote:
I will NEVER fly or tell anyone to fly on a Kapton-wired aircraft.


Dear 1989,

In this case, you should stop flying altogether. Kapton is found in every single commercial jetliner since the 1960 to this date.

Best regards,
Hendric

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by hitower3
Tue Feb 12, 2019 4:10 pm
Forum: Civil Aviation
Topic: Official: Airbus announces A380 production to end in 2021
Replies: 870
Views: 104917

Re: [Rumor] Airbus to announce end of A380 production

Hello,

Whilie this - if confirmed - is not at all a surprise, it is still a rather sad moment for Airbus and aviation industry in general.

Farewell, big whale!
Hendric

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by hitower3
Tue Feb 12, 2019 10:37 am
Forum: Technical/Operations
Topic: Fear of flying, working on getting better but still scared about maintenance
Replies: 84
Views: 8222

Re: Fear of flying, working on getting better but still scared about maintenance

Dear akb88, First of all I appreciate your open words a lot - expressing your fear certainly is a good first step to overcome it. Technical arguments like "flying is an extremely safe means of transport" are certainly valid and proven, but they likely won't help you to overcome your fear. ...

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by hitower3
Mon Feb 11, 2019 2:51 pm
Forum: Travel, Polls & Preferences
Topic: Large airports without rail links
Replies: 103
Views: 9335

Re: Large airports without rail links

LUXembourg, but I heard they're working on a rail link.

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by hitower3
Thu Jan 31, 2019 3:43 pm
Forum: Civil Aviation
Topic: Germania ceases operations
Replies: 144
Views: 33209

Re: Germania in trouble

https://www.aero.de/news-30854/Germania-verpasst-Gehaltstermin-im-Januar.html Latest news: Germania CEO Carsten Balke informed his employees that the salary payments for January will be delayed. Payment was due today. Also, there are reports of employees calling in sick. The background is that the ...

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by hitower3
Wed Jan 23, 2019 4:38 pm
Forum: Travel, Polls & Preferences
Topic: Worst seat mates in memory
Replies: 52
Views: 4648

Re: Worst seat mates in memory

I once sat in a middle seat, next to an elderly person with a breath that made me wonder if he was still alive. Well, he was very much alive and has a whole lot of things to tell me. I didn't want to be unkind so I kept listening.
I would have appreciated to have a lockable nose like a dolphin...

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by hitower3
Wed Jan 23, 2019 3:44 pm
Forum: Civil Aviation
Topic: a MTOW increase on 787-10 to compete with A359?
Replies: 604
Views: 86158

Re: a MTOW increase on 787-10 to compete with A359?

Granted, DL's birds are denser, but they could also up their extant aircraft to 277T with the stroke of a cheque, as well as uprate their TBD aircraft to 280T by the same means. Dear LAX, I would be interested to know what such a check would amount to. Are we talking about 100k$, millions? Best reg...

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by hitower3
Wed Jan 23, 2019 2:59 pm
Forum: Technical/Operations
Topic: How is the shutdown affecting you? How is it affecting your operations?
Replies: 24
Views: 3808

Re: How is the shutdown affecting you? How is it affecting your operations?

Doesn't matter, even if the airplane can be imported, the airline still needs an FAA inspector to add the aircraft to the airline's opspec in order to place it into revenue service. The FAA inspectors are not working. So no new planes have been placed into service since December 22. Dear Woodreau, ...

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by hitower3
Wed Jan 23, 2019 9:49 am
Forum: Technical/Operations
Topic: How is the shutdown affecting you? How is it affecting your operations?
Replies: 24
Views: 3808

Re: How is the shutdown affecting you? How is it affecting your operations?

Our airline has aircraft awaiting delivery from Airbus, but can’t import the aircraft due to the shutdown, but even if they could import it, the FAA inspectors aren’t able to add the aircraft to the airline opspecs in order for us to put the aircraft into revenue service. Dear Woodreau, Could there...

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by hitower3
Fri Jan 11, 2019 9:26 am
Forum: Civil Aviation
Topic: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100
Replies: 24
Views: 4087

Re: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100

It's strange to me that the structural efficiency (OEW/MTOW) is so much worse for the A220 than the others. DC-7: 51% CV-880: 46% A220: 58%. Carbon fibre is weaker than 1950's aluminum? Design tools were better in 1950?? Hello kitplane, I am very confident that both materials and construction tools...

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by hitower3
Wed Jan 09, 2019 3:15 pm
Forum: Civil Aviation
Topic: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100
Replies: 24
Views: 4087

Re: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100

I'm going to guess that in the late 50's if even premium auto gas was 30-35 cents a gallon, Aviation Hi Octane was probably 50 cents? My point being, the relative cost of fuel per seat mile. While the CV-880 ( the best comparison? maybe a B-720?) gobbled kerosene, it was darn cheap . Maybe someone ...

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by hitower3
Wed Jan 09, 2019 3:06 pm
Forum: Civil Aviation
Topic: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100
Replies: 24
Views: 4087

Re: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100

PS, where did the 1570 kg/hr for the A220 come from. That is better than the numbers I have. I think all three planes have their fuel burn underestimated for a mission by a significant amount. Dear lightsaber, Thank you very much for your answer. I have taken the fuel burn figures (all 3 of them) f...

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by hitower3
Wed Jan 09, 2019 1:01 pm
Forum: Civil Aviation
Topic: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100
Replies: 24
Views: 4087

An unfair comparison II - DC-7 vs. CV-880 vs. A220-100

Dear fellow A-netters, Today, I am following up to an earlier, similar post http://www.airliners.net/forum/viewtopic.php?f=5&t=1388811 where I compared the performance and economics of an A321-200LR to a Boeing B707-320B, which was found interesting by quite a few readers. For this second round ...

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