Search found 240 matches

by hitower3
Wed Oct 13, 2021 2:25 pm
Forum: Technical/Operations
Topic: Is innovation declining?
Replies: 76
Views: 3557

Re: Is innovation declining?

It really isn't all engine. The A350 wing is much more efficient than the A330/A340. The cruising altitude and speed of the A350 are quite different compared to the A340. Several thousand feet higher initial altitude. M0.85 compared to M0.81-0.82 doesn't sound like much but over medium and long hau...

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by hitower3
Wed Oct 13, 2021 2:19 pm
Forum: Technical/Operations
Topic: Is innovation declining?
Replies: 76
Views: 3557

Re: Is innovation declining?

I'd be curious how much of the efficiency of the A350 over the A330 (and over the B747) comes from a lighter structure. The A350-900 has an OEW of 115,7t, whereas the A330-300 has 122t (Wikipedia). However, the A350 carries about 10% more people at similar layout. The OEW difference itself will res...

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by hitower3
Mon Sep 27, 2021 11:42 am
Forum: Technical/Operations
Topic: A couple of battery electric aircraft questions. 1 noise, and 1 cost.
Replies: 7
Views: 916

Re: A couple of battery electric aircraft questions. 1 noise, and 1 cost.

Let's look at the cost: Jet A1 fuel currently costs approx 0,64€/kg and contains about 12kWh/kg. The cost per kWh is therefore about 5,34ct/kWh Electricity for industrial scale users currently sells around 6-7ct/kWh. Now assuming an overall efficiency of a modern turbofan engine of 40% and the one o...

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by hitower3
Mon Sep 27, 2021 11:23 am
Forum: Technical/Operations
Topic: A330 Rod Assy we cant figure out what its for.
Replies: 4
Views: 962

Re: A330 Rod Assy we cant figure out what its for.

Would it be possible to show a picture?
I am sure there is someone in the forum who knows the answer!
Hendric

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by hitower3
Mon Sep 27, 2021 11:20 am
Forum: Technical/Operations
Topic: What constitutes a dive as opposed to a sinking situation in an aircraft?
Replies: 8
Views: 753

Re: What constitutes a dive as opposed to a sinking situation in an aircraft?

Indeed. Even in an emergency descent, the pitch angle is not very steep. I can't remember exactly but my impression is that you don't exceed around negative ten degrees. Dear SB, This sounds absolutely logical. Assuming an emergency descent rate of 8'000fpm, this is a vertical speed of approx. 40m/...

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by hitower3
Mon Sep 20, 2021 7:35 am
Forum: Civil Aviation
Topic: Airports That Have Suffered From Improved Road / Rail Infrastructure
Replies: 46
Views: 5430

Re: Airports That Have Suffered From Improved Road / Rail Infrastructure

One example from Austria: The connection between Linz and Vienna was dropped after the high speed rail connection was opened a few years ago.
It's likely that in a few years from now, also Salzburg-VIE and Graz-VIE will shift towards HSR connection.

Hendric

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by hitower3
Thu Sep 16, 2021 11:24 am
Forum: Travel, Polls & Preferences
Topic: Should Airbus consider the Airbus 350-800 again ?
Replies: 24
Views: 3983

Re: Should Airbus consider the Airbus 350-800 again ?

I would say no as well.
A 358 would find itself in the same black hole of the market like the 319-NEO. As other said, there are plenty of offerings that cover this market segment in the form of the 359 and 330 NEO.

I would be interested to know what you think Airbus should do next in the WB segment?

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by hitower3
Wed Sep 15, 2021 2:15 pm
Forum: Technical/Operations
Topic: Are four engine airliners harder to handle than twins?
Replies: 26
Views: 4153

Re: Are four engine airliners harder to handle than twins?

By design, Airbus aircraft are very similar in cockpit and procedures. From the example above, the A330 and A340 are pretty much the same aircraft type. The A350 is a bit different but certainly close enough for a common rating. (...) Dear Starlionblue, I would think that the 340 requires a bit mor...

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by hitower3
Thu Sep 02, 2021 12:14 pm
Forum: Technical/Operations
Topic: Munich Airport (EDDM) Taxiway/Apron White Rectangle Markings
Replies: 3
Views: 688

Re: Munich Airport (EDDM) Taxiway/Apron White Rectangle Markings

Adding further speculation:
Could they be markings for sensors that detect the presence of an airplane?

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by hitower3
Fri Aug 27, 2021 9:58 am
Forum: Civil Aviation
Topic: United Fleet, Network, and Discussion Thread - Q3 2021
Replies: 1315
Views: 294388

Re: United BOS-LHR

Pan Am’s 707-121 turbojets never flew LAP-IDL nonstop. The outbound leg out of New York stopped in Gander and the return to the United States stopped in Keflavik. Not occasional stops, daily scheduled stops. And American Airlines’ 707-123 turbojets even made occasional stops for fuel operating IDL-...

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by hitower3
Fri Aug 27, 2021 7:59 am
Forum: Civil Aviation
Topic: United Fleet, Network, and Discussion Thread - Q3 2021
Replies: 1315
Views: 294388

Re: United BOS-LHR

Dear all, Sorry to have unintentionally opened a can of worms here. :-) My remark about the whole fleet of UA being capable to fly LHR-BOS did not imply that UA should start flying narrowbodies on that route, or that all NBs are actually ETOPS certified, or that it would make economic sense to use 7...

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by hitower3
Thu Aug 26, 2021 3:45 pm
Forum: Civil Aviation
Topic: United Fleet, Network, and Discussion Thread - Q3 2021
Replies: 1315
Views: 294388

Re: United BOS-LHR

Fun fact: ALL aircraft currently in UA's mainline fleet are able to complete the route LHR-BOS non-stop.

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by hitower3
Wed Aug 25, 2021 7:35 pm
Forum: Technical/Operations
Topic: Size of speed brakes[spoilers] on airliners?
Replies: 14
Views: 1725

Re: Size of speed brakes[spoilers] on airliners?

Highly interesting topic indeed! To contrast with the complexity of the 777 spoiler system, here is the observed control logic in the Fokker 70/100: When weight on wheels: all spoilers up. No speed brake or aileron augmentation functions to my knowledge. There is a speed brake in the tail cone though.

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by hitower3
Fri Aug 06, 2021 7:47 am
Forum: Technical/Operations
Topic: Huge rush of cabin air when the DC-10 decelerated?
Replies: 5
Views: 1331

Re: Huge rush of cabin air when the DC-10 decelerated?

Hi,

I can report this exact same behaviour on the Fokker 70/100. Every change in engine power was accompanied by a clearly noticeable change in air flow into the cabin.
Fortunately, this did not affect the cabin pressure level, so my ears did not complain about it.

Hendric

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by hitower3
Fri Aug 06, 2021 7:43 am
Forum: Technical/Operations
Topic: Question For the Mechanics: Which Commercial Aircraft Have Been Easiest and Most Difficult For You to Work On?
Replies: 56
Views: 8872

Re: Question For the Mechanics: Which Commercial Aircraft Have Been Easiest and Most Difficult For You to Work On?

Dear all, This is a highly interesting read even though I am not an aviation professional. One side question arises: What happens if you are doing maintenance on a big jet and you happen to get "stuck" - like a system not behaving as expected, or a maintenance manual that gives unclear ins...

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by hitower3
Tue Aug 03, 2021 10:09 am
Forum: Civil Aviation
Topic: Bombardier CL 600 down near Truckee, California
Replies: 136
Views: 27573

Re: Bombardier CL 600 down near Truckee, California

I joined this forum to have a question answered, I don't have any aviation knowledge but was on the golf course that day and was about 100 yards from impact. Let me start by stating I noticed the sound was lower that the rest of the jets that day, I turned to locate the jet and then heard the sound...

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by hitower3
Mon Aug 02, 2021 3:33 pm
Forum: Travel, Polls & Preferences
Topic: Longest commercial flight record
Replies: 30
Views: 4033

Re: Longest commercial flight record

Also, not exactly a "scheduled" (as in "regularly operated") flight, but Austrian flew a 777-200ER from Vienna to Sydney for Covid repatriations. Close to 18h, a remarkable endurance for a 777E! https://www.flugrevue.de/zivil/nonstop-wien-sydney-laengster-flug-in-der-geschichte-v...

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by hitower3
Mon Aug 02, 2021 3:30 pm
Forum: Travel, Polls & Preferences
Topic: Longest commercial flight record
Replies: 30
Views: 4033

Re: Longest commercial flight record

Maybe a look into the past would reveal some extraordinary long flights performed by DC-7C or Lockheed L-1649 Starliners? From the data I have available, they flew at roughly 500km/h with an autonomy of roughly 9000km, theoretically resulting in 18h flights. I would be grateful if someone with bette...

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by hitower3
Thu Jul 29, 2021 8:50 am
Forum: Civil Aviation
Topic: Condor orders Airbus A330-900neo
Replies: 135
Views: 29348

Re: Condor orders Airbus A330-900neo

Your wish came true, three class confguration is confirmed, but actual layout is unknown. They will roll out new Business Class, Premium Economy Class and Economy Class. Confirmed in Airbus press release today. https://www.airbus.com/newsroom/press-releases/en/2021/07/condor-selects-airbus-a330neo-...

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by hitower3
Thu Jul 29, 2021 1:56 am
Forum: Civil Aviation
Topic: Condor orders Airbus A330-900neo
Replies: 135
Views: 29348

Re: Condor orders Airbus A330-900neo

tjwgrr wrote:
LH748 wrote:
It's sad to see the 763 leave but I think that the 339 is the best fit.


More 763s for Amazon.......


Condor's 763 fleet is 27-29 years old. Not sure if there is enough life left in them to warrant a freighter conversion.

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by hitower3
Wed Jul 28, 2021 7:31 pm
Forum: Technical/Operations
Topic: What Is it? Old Luggage Container?
Replies: 29
Views: 3606

Re: What Is it? Old Luggage Container?

Interesting!
What would the "burn rate" on the sticker specify?
Did that container protect an auxiliary heating or fuel-operated generator?
Or has it to do with the fire load for fire safety assessment?

I'm puzzled...
Hendric

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by hitower3
Wed Jul 28, 2021 7:30 pm
Forum: Technical/Operations
Topic: What Is it? Old Luggage Container?
Replies: 29
Views: 3606

Re: What Is it? Old Luggage Container?

Interesting!
What would the "burn rate" on the sticker specify?
Did that container protect an auxiliary heating or fuel-operated generator?
Or has it to do with the fire load for fire safety assessment?

I'm puzzled...
Hendric

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by hitower3
Wed Jul 28, 2021 7:22 pm
Forum: Technical/Operations
Topic: Maximum gross weight step climb question
Replies: 20
Views: 1948

Re: Maximum gross weight step climb question

While I can't answer based on hard facts, my bet would be on shorter range aircraft, as these will lose less weight in-flight. I would not be surprised if an ATR 42 could reach FL250 after taking off at MTOW. Also, the shortest aircraft of a family sharing the same wing, e. g. A318, B736... might be...

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by hitower3
Mon Jul 26, 2021 11:13 am
Forum: Civil Aviation
Topic: A321 Tire Replacement
Replies: 18
Views: 6051

Re: A321 Tire Replacement

On a side note, the A321 has got different tires/wheels from the rest of the A320 family.
So, it is not entirely unthinkable that they simply haven't got a suitable spare tire in Sofia.

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by hitower3
Fri Jul 23, 2021 10:03 am
Forum: Technical/Operations
Topic: BA 747-100 engines
Replies: 9
Views: 1593

Re: BA 747-100 engines

extender wrote:
A listing of the model numbers with engine types. The CF6-80C2 is added to the -200 for USAF configurations.

(...)


On a.net, there is always someone who really knows the complete and precise answer... :-)

Hendric

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by hitower3
Wed Jun 30, 2021 1:52 pm
Forum: Technical/Operations
Topic: How much does a typical airline pilot know about his/her aircraft?
Replies: 22
Views: 4122

Re: How much does a typical airline pilot know about his/her aircraft?

SAAFNAV wrote:
But it keeps you busy on long flights. We had some engineers who'd get creative with their questions with new F/E's, and you'd better know which parts on the C-130 was made of wood.


LOL, let me guess: the friction pads that slow down the nose wheel after gear retraction are made of wood?

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by hitower3
Mon Jun 28, 2021 3:00 pm
Forum: Technical/Operations
Topic: How much does a typical airline pilot know about his/her aircraft?
Replies: 22
Views: 4122

How much does a typical airline pilot know about his/her aircraft?

Dear a.netters, I am reading with great pleasure and interest the technical topics that are discussed in particular in this sub-forum and it appears that we've got a number of contributors who seem to know even the tiniest details about specific aircraft systems, parts, procedures etc. Many of them ...

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by hitower3
Mon Jun 14, 2021 1:45 pm
Forum: Civil Aviation
Topic: Steven Udvar-Hazy: 737 needs replacement
Replies: 144
Views: 16300

Re: Steven Udvar-Hazy: 737 needs replacement

By the way, would Boeing even have access to the funding required to carry out a clean-sheet programme anytime soon?

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by hitower3
Mon Jun 14, 2021 8:31 am
Forum: Technical/Operations
Topic: DFW - You're number ???? for takeoff!
Replies: 42
Views: 7127

Re: DFW - You're number ???? for takeoff!

Starlionblue wrote:

I don't know the A320 but if memory serves, on the A330 it's about 800kg per hour per engine at ground idle. So in total about 27kg per minute.


Phew, that is a LOT of fuel! In cruise, one engine (ex. RR Trent 700) will burn roughly 2'700 to 3'000kg/h, only a factor 3,5x more.

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by hitower3
Sun Jun 13, 2021 7:46 am
Forum: Technical/Operations
Topic: DFW - You're number ???? for takeoff!
Replies: 42
Views: 7127

Re: DFW - You're number ???? for takeoff!

Hello,

Very interesting thread indeed.
One question regarding waiting times: How much fuel will an airliner, let's say an A320, burn per minute at idle power?

Best regards,
Hendric

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by hitower3
Tue Jun 01, 2021 4:35 am
Forum: Civil Aviation
Topic: Ouch—AA at DFW hits light pole
Replies: 121
Views: 16794

Re: Ouch—AA at DFW hits light pole

Dear all,

Duct tape jokes aside, what would be the cost to repair such a damage?

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by hitower3
Thu May 06, 2021 2:42 pm
Forum: Technical/Operations
Topic: What is the minimum battery power density needed for a 2000nm range?
Replies: 20
Views: 2868

Re: What is the minimum battery power density needed for a 2000nm range?

Hello Vladex, Challenge accepted. :-) I take the following starting point: conventional airplanes burn approximately 1/30th of their current weight per hour - as an example an A320 would burn about 2.5t per hour at an assumed weight of 75t. Assuming an energy density of 12kWh per kg of kerosene, the...

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by hitower3
Tue Apr 27, 2021 8:30 am
Forum: Technical/Operations
Topic: boeing 747 400X, the 400 under a different name or something else?
Replies: 10
Views: 3226

Re: boeing 747 400X, the 400 under a different name or something else?

LH707330 wrote:
The 400X became the 400ER, which as the article mentions is barely externally different. The only physical change is the very slightly larger tires (51" vs 50" IIRC), which in 144 is negligible.


Did'nt the -400ER have slightly taller winglets too?

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by hitower3
Tue Apr 27, 2021 8:27 am
Forum: Technical/Operations
Topic: A321 vs B739 Fuel burn
Replies: 32
Views: 6621

Re: A321 vs B739 Fuel burn

Dear all, May I expand the question towards the next generation of these aircraft: A321N and 737-Max9? I could guess that the 321N takes a better advantage from the newer engine, since it allows a bigger fan than its counterpart on the Max, but this space issue had been present on the 737 since the ...

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by hitower3
Tue Apr 20, 2021 7:59 am
Forum: Technical/Operations
Topic: Is it possible to access the cargo compartment from the passenger compartment?
Replies: 52
Views: 12697

Re: Is it possible to access the cargo compartment from the passenger compartment?

A few years ago we had a weight savings program for our aircraft. They told us each kilogram removed from every aircraft in the fleet would save €30.000 per year. [...] I have not weighed the ladder assy on the A330/340 but I assume it's around 10kg or somewhere in that ballpark. Hello Horstroad, I...

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by hitower3
Sat Apr 17, 2021 1:39 pm
Forum: Technical/Operations
Topic: What else is an ATPL pilot allowed to fly?
Replies: 4
Views: 2062

Re: What else is an ATPL pilot allowed to fly?

Thanks to all of you for your insights!
Hendric

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by hitower3
Sat Apr 17, 2021 5:38 am
Forum: Technical/Operations
Topic: What else is an ATPL pilot allowed to fly?
Replies: 4
Views: 2062

What else is an ATPL pilot allowed to fly?

Hello! Let's take an ATPL pilot with a A320 type rating. As far as I know, this license will allow the holder to fly all A320 series jets, obviously. But what types of aircraft are implicitly included, so they can be flown without any additional license/type rating/mandatory training? Single engine ...

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by hitower3
Sat Apr 17, 2021 5:24 am
Forum: Technical/Operations
Topic: Is it possible to access the cargo compartment from the passenger compartment?
Replies: 52
Views: 12697

Re: Is it possible to access the cargo compartment from the passenger compartment?

Starlionblue wrote:
I've gone through the avionics hatch in the cockpit, into the avionics compartment, and into the forward hold.


Good morning!

Is it true that you can also escape from the avionics bay to the tarmac by opening another hatch that gives access to the nose gear bay?

Best regards,
Hendric

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by hitower3
Wed Mar 10, 2021 1:39 pm
Forum: Civil Aviation
Topic: Airbus A350 Production/Delivery Thread - 2021
Replies: 395
Views: 159414

Re: Airbus A350 Production/Delivery Thread - 2021

Interesting: It looks like they no longer use Times New Roman for the name of the country. The have a new font which IMHO looks not very professional. The first A350 for Luftwaffe still has titles in Times New Roman. Yes, this is correct. They changed the font from Times New Roman to "Bundes S...

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by hitower3
Wed Feb 24, 2021 1:34 pm
Forum: Technical/Operations
Topic: Shortest runway airports with regular A380 service
Replies: 27
Views: 6137

Re: Shortest runway airports with regular A380 service

Looking at the A380 technical data doc that I found here: https://www.airbus.com/content/dam/corporate-topics/publications/backgrounders/techdata/aircraft_characteristics/Airbus-Aircraft-AC-A380.pdf If I read it correctly, it looks like the max weight variant has an MTOW of 575000 kg (1,267,658 lbs...

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by hitower3
Mon Feb 01, 2021 11:31 am
Forum: Technical/Operations
Topic: Average number of cycles for aircraft tyres ? Who are the main suppliers ?
Replies: 20
Views: 3965

Re: Average number of cycles for aircraft tyres ? Who are the main suppliers ?

Discarded aircraft tires, new or old, are welcomed in other industries: Dear Rotax, I can confirm that. My uncle owns a farm in Germany and his manure trailer was equipped with 4 large aircraft tires. They were much less inflated (about 2bar / 29psi) to better distribute the load on a large surface...

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by hitower3
Wed Jan 27, 2021 9:20 am
Forum: Technical/Operations
Topic: A220-100 is the new 757-200
Replies: 47
Views: 5382

Re: A220-100 is the new 757-200

Starlionblue wrote:

The explanation for why you might derate on a contaminated runway is a bit complex, but bear with me.


Dear Starlionblue,

Thank you very much for your extensive and insightful answer.
I might need to read it a few more times to fully understand it, though... :-)

Best regards,
Hendric

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by hitower3
Tue Jan 26, 2021 3:43 pm
Forum: Technical/Operations
Topic: Why was N106US the a320 involved in the hudson river ditching never repaired?
Replies: 30
Views: 5274

Re: Why was N106US the a320 involved in the hudson river ditching never repaired?

Check out the state of the aircraft and how much further damage was done when it was lifted. No was was this ever going to be an 'economic repair'. https://www.baaa-acro.com/crash/crash-airbus-a320-new-york OK, no further questions - the electronics bay and all other sensitive systems were submerge...

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by hitower3
Tue Jan 26, 2021 3:37 pm
Forum: Technical/Operations
Topic: A220-100 is the new 757-200
Replies: 47
Views: 5382

Re: A220-100 is the new 757-200

Starlionblue wrote:
On a contaminated runway, it could well have been a fixed derate.


Dear Starlionblue,

Oh, ok - I thought that contaminated runways (e.g. snow) would often mandate a full power takeoff as per SOP, because the start-stop distance is longer.
I stand corrected then.

Best regards,
Hendric

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by hitower3
Tue Jan 26, 2021 6:00 am
Forum: Technical/Operations
Topic: A220-100 is the new 757-200
Replies: 47
Views: 5382

Re: A220-100 is the new 757-200

Dear Swiss03,

Question : was your takeoff performed on a contaminated runway? Was this a short flight, e.g. Zurich-Geneva? Was the cabin rather empty?

If yes, you were lucky to experience a full power takeoff in a light plane.

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by hitower3
Tue Jan 12, 2021 10:57 am
Forum: Civil Aviation
Topic: Sriwijaya Air 737-500 (SJ182 CGK-PNK) crashes shortly after takeoff
Replies: 867
Views: 258063

Re: Sriwijaya Air 737-500 (SJ182 CGK-PNK) crashes shortly after takeoff

Dear all, Thank you very much for your educated and first-hand information. I hope the cause(s) of this terrible catastrophe will be found soon. I just had a though for the investigators now listening to the CVR - how horrific it must feel to know that you will be listening to the last moments of tw...

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by hitower3
Sat Jan 09, 2021 5:30 pm
Forum: Technical/Operations
Topic: VFR with Airliners
Replies: 62
Views: 5125

Re: VFR with Airliners

I remember reading about an Air Berlin A320 that performed a commercial flight within Germany (Munich-Hamburg or similar) during the grounding due to the Icelandic volcano Eyafjoll. As the upper airspace was closed, the crew flew VFR below a rather low cloud base around 4000ft, which was widely crit...

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