Search found 248 matches

by hitower3
Sat Nov 27, 2021 11:25 am
Forum: Technical/Operations
Topic: 787 Cruise Mach at Cost Index 300
Replies: 10
Views: 731

Re: 787 Cruise Mach at Cost Index 300

gloom wrote:
I know both LH and LO do (or did) that sort of cruise speed calculation. Go on 280/.74/300 profile, and it's done. Would you care to guess the plane by numbers? ;)


My guess would be a 737 classic.
Hendric

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by hitower3
Tue Nov 16, 2021 8:46 pm
Forum: Civil Aviation
Topic: Last scheduled passenger transatlantic crossing in a prop aircraft?
Replies: 56
Views: 10015

Re: Last scheduled passenger transatlantic crossing in a prop aircraft?

The DC-8-63 entered service in July 1967. KLM was the initial operator. Not sure what their initial passenger capacity was, but it was more than 189. The CL-44D has entered service at Loftleiðir in may 1964, so it may indeed have been the biggest airliner over the Atlantic Ocean for just over 3 yea...

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by hitower3
Tue Nov 16, 2021 12:31 pm
Forum: Civil Aviation
Topic: Last scheduled passenger transatlantic crossing in a prop aircraft?
Replies: 56
Views: 10015

Re: Last scheduled passenger transatlantic crossing in a prop aircraft?

Fun fact: at one time shortly before the arrival of the 747, the Canadair CL-44 was the highest capacity aircraft flying over the Atlantic ocean. These had 189 seats.

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by hitower3
Mon Nov 08, 2021 4:35 pm
Forum: Technical/Operations
Topic: Procedures if a sick/incapicated pilot or co-pilot in flight ?
Replies: 15
Views: 1798

Re: Procedures if a sick/incapicated pilot or co-pilot in flight ?

Dear ltbewr.

Most likely, cabin crew would evacuate the incapacitated pilot towards the forward galley.
It's much more convenient to start the treatment there, instead of inside the cramped cockpit, where an additional person might inadvertently touch a control or a switch.

Hendric

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by hitower3
Mon Nov 08, 2021 10:08 am
Forum: Technical/Operations
Topic: 121.5 now a political forum in US
Replies: 43
Views: 5211

Re: 121.5 now a political forum in US

(Edit: initial post asking about the possibility to use 123.45 for off-topic chat replaced by additional info) I wondered whether VHF 123.45 could be used for "off-topic" conversations between pilots. The answer is NO, except - with reservations - in oceanic space far from VHF ground stati...

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by hitower3
Wed Nov 03, 2021 3:19 pm
Forum: Technical/Operations
Topic: Restrictions on #2 Thrust Reverse L1011/DC10/MD11
Replies: 20
Views: 2226

Re: Restrictions on #2 Thrust Reverse L1011/DC10/MD11

Talking about thrust reversers on a DC-10 or MD-11, would nr. 2 also be subject for retraction below 80/60kn like on most wing-engined aircraft?
I understand that the speed limit is there to avoid FOD ingestion, but this should not be an issue on the engine some 10m (?) above ground?

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by hitower3
Tue Nov 02, 2021 5:26 pm
Forum: Technical/Operations
Topic: Use of rudder in commercial aircraft
Replies: 18
Views: 2031

Re: Use of rudder in commercial aircraft

Oh yeah, engine out seems logical.
Isn't Airbus FBW trained to compensate asymmetric thrust automatically, though?

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by hitower3
Tue Nov 02, 2021 12:50 pm
Forum: Technical/Operations
Topic: Use of rudder in commercial aircraft
Replies: 18
Views: 2031

Use of rudder in commercial aircraft

Dear a.netters, I wonder how much pilots of commercial aircraft will use the rudder at all. My assumption is that manual input on the pedals is required only during takeoff in crosswind, during flare or just at touchdown to align the aircraft to the runway (x-wind scenario again), and finally to kee...

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by hitower3
Wed Oct 13, 2021 2:25 pm
Forum: Technical/Operations
Topic: Is innovation declining?
Replies: 89
Views: 4983

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: 89
Views: 4983

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: 965

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: 1021

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: 806

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: 5524

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: 26
Views: 4434

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: 4352

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: 724

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: 297268

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: 297268

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: 297268

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: 1800

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: 1363

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: 71
Views: 12493

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: 27929

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: 4109

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: 4109

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: 29741

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: 29741

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: 3683

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: 3683

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: 2000

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: Technical/Operations
Topic: A321 Tire Replacement
Replies: 18
Views: 6107

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: 1644

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: 4179

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: 4179

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: 16442

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: 7204

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: 7204

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: 16920

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: 21
Views: 3421

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: 3276

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: 6754

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: 12881

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: 2093

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: 2093

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: 12881

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: 448
Views: 183636

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: 6236

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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