Search found 287 matches

by hitower3
Sat May 28, 2022 5:38 pm
Forum: Civil Aviation
Topic: A321XLR vs first generation long haul jets
Replies: 9
Views: 2506

Re: A321XLR vs first generation long haul jets

viewtopic.php?t=1388811

Best regards!
Hendric
-->

Dear Mike,

I did a comparison between the LR and the 707 in this thread:
viewtopic.php?t=1388811

Best regards!
Hendric

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by hitower3
Sun May 08, 2022 6:36 pm
Forum: Technical/Operations
Topic: Double-hinged flap explained or shown??
Replies: 9
Views: 1075

Re: Double-hinged flap explained or shown??

Dear Convair, I am not entirely sure if the author may not have meant "double slotted flaps", as the DC10's flaps were single slotted. If it was indeed about double hinged flaps, the idea could have been an implementation of a NASA patent from 1967: https://ntrs.nasa.gov/citations/19700032...

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by hitower3
Sun May 08, 2022 12:37 pm
Forum: Technical/Operations
Topic: CFM Engine High Oil Consumption
Replies: 28
Views: 3076

Re: CFM Engine High Oil Consumption

Just a practical question: In the case of tri-jets, in particular the DC-10 and MD-11, the engine nr. 2 is mounted some 10m above ground. How is the oil level control and top-up performed? Logically, a cherry picker or similar device would be required to access the engine. Or is there a possibility ...

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by hitower3
Fri May 06, 2022 2:45 pm
Forum: Civil Aviation
Topic: Six arrests after brawl on board KLM flight
Replies: 56
Views: 12945

Re: Six arrests after brawl on board KLM flight

Aircraft was parked at the gate when this brawl broke out. So at not time was there any risk inflight. Call was made to the military police at Schiphol who arrived quickly and removed the party. This from a internal klm memo. Dear Flanker7, Thank you for this important clarification! In this case t...

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by hitower3
Fri May 06, 2022 8:08 am
Forum: Civil Aviation
Topic: Six arrests after brawl on board KLM flight
Replies: 56
Views: 12945

Re: Six arrests after brawl on board KLM flight

One thing that I find disturbing (apart from the recurrence of such events in general) is that in this case the captain entered the passenger cabin attempting to calm the fighters. In my view as someone not familiar with the relevant procedures in place, isn't this a significant risk for this situat...

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by hitower3
Fri Apr 29, 2022 7:50 am
Forum: Civil Aviation
Topic: BEA : EgyptAir MS804 crash caused by pilot smoking
Replies: 62
Views: 15456

Re: BEA : EgyptAir MS804 crash caused by pilot smoking

Dear all, Regarding flammability of materials, there is a significant property called the Limit Oxygen Index (LOI). This index, expressed in %, defines the concentration of oxygen required to allow the material in question to sustain combustion at room temperature. Typical insulation materials have ...

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by hitower3
Fri Apr 29, 2022 7:36 am
Forum: Technical/Operations
Topic: Augmented crew - logging flight hours
Replies: 28
Views: 3042

Re: Augmented crew - logging flight hours

Dear all, Thank you for the interesting insights so far! Let me formulate a bonus question: How are pilots logging flight hours in practice? Have you got a classic booklet where you had write your hours? Is it an online tool or a program on your PC? Would you take these records with you in case of c...

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by hitower3
Mon Apr 25, 2022 12:49 pm
Forum: Civil Aviation
Topic: Airbus A321XLR Development / Testing / Production Thread - 2022
Replies: 133
Views: 25819

Re: Airbus A321XLR Development / Testing / Production Thread - 2022

By the way, will the XLR get a separate ICAO designator?

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by hitower3
Mon Apr 18, 2022 6:51 am
Forum: Technical/Operations
Topic: Augmented crew - logging flight hours
Replies: 28
Views: 3042

Augmented crew - logging flight hours

Dear all, Just a short, stupid question: How are flight hours logged for pilots in an augmented crew setting? Let's assume a 12h flight with a crew of 3 (CA, FO, Cruise pilot). Would all 3 get the full 12h flight time credited to their logbook, or only these hours they are actually on duty? Thanks! ...

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by hitower3
Tue Apr 12, 2022 2:38 am
Forum: Technical/Operations
Topic: Can Singapore Airlines 253 seats A350 do SIN-NYC mission if they are 280T variant?
Replies: 17
Views: 3700

Re: Can Singapore Airlines 253 seats A350 do SIN-NYC mission if they are 280T variant?

5% contingency is normally not required for this type of flight. Some sort of variable contingency depending on route and conditions is carried. Often several tonnes less than 5%. 0.5 hours of reserve fuel is carried, and typically diversion fuel is also no less than 0.5 hours even if the nearest a...

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by hitower3
Mon Apr 11, 2022 2:33 pm
Forum: Technical/Operations
Topic: Can Singapore Airlines 253 seats A350 do SIN-NYC mission if they are 280T variant?
Replies: 17
Views: 3700

Re: Can Singapore Airlines 253 seats A350 do SIN-NYC mission if they are 280T variant?

Dear SQ32,

0,6 hours of reserve fuel is just a little on the low side. :D
A contingency of 5% (5,6t) must be accounted for, plus diversion (a few tons), plus final reserve (3t).

Maybe your assumptions for OEW and flight time are a little on the high side.

Best regards,
hendric

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by hitower3
Mon Apr 11, 2022 7:52 am
Forum: Civil Aviation
Topic: China Eastern 737-800 crashes in Guangxi, southern China
Replies: 1166
Views: 431023

Re: China Eastern 737-800 crashes in Guangxi, southern China

Malaysia Airlines' incident a few weeks ago, also a 738. Similarities? https://www.straitstimes.com/asia/se-asia/malfunction-of-pitot-static-system-affected-tawau-bound-malaysia-airlines-flight "Based on initial reports extracted from the flight data recorder (FDR), it was determined that a te...

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by hitower3
Sun Apr 10, 2022 4:13 am
Forum: Technical/Operations
Topic: Location of data plate on Airbus aircraft
Replies: 17
Views: 2408

Re: Location of data plate on Airbus aircraft

There are at least two of them: one in the door frame of L1, one in the rearmost door on the left side.

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by hitower3
Fri Apr 08, 2022 10:35 am
Forum: Civil Aviation
Topic: DHL 757 off runway at SJO
Replies: 131
Views: 25891

Re: DHL 757 off runway at SJO

Why do they refer to 'two souls on board' rather than two people?. This seemingly bizarre terminology is used to avoid any confusion. "Passengers" would not account for flight and cabin crew, "people" would not account for lap children, as they are treated differently on the pas...

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by hitower3
Wed Apr 06, 2022 8:50 am
Forum: Civil Aviation
Topic: AF 011 go around - Possible flight control issue
Replies: 106
Views: 32018

Re: AF 011 go around

Can someone with knowledge in the 777 systems please give us a hint what is the signification of the alarm sounds in the flight deck which can be heard in the video? Autopilot disconnect wailer. Dear allnippon767, The sound at 0:43 is similar to a configuration warning sound. Could you confirm this...

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by hitower3
Wed Apr 06, 2022 6:48 am
Forum: Civil Aviation
Topic: AF 011 go around - Possible flight control issue
Replies: 106
Views: 32018

Re: AF 011 go around

Can someone with knowledge in the 777 systems please give us a hint what is the signification of the alarm sounds in the flight deck which can be heard in the video?

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by hitower3
Mon Apr 04, 2022 12:58 pm
Forum: Civil Aviation
Topic: Condor launch new livery
Replies: 271
Views: 33350

Re: Condor launch new livery

Honestly, I am amused!
I would say that this livery does indeed fulfill the main purpose: make the airline recognisable while transporting the image of the carrier.

I'd say: "mission accomplished!"

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by hitower3
Mon Mar 21, 2022 9:02 am
Forum: Civil Aviation
Topic: China Eastern 737-800 crashes in Guangxi, southern China
Replies: 1166
Views: 431023

Re: China Eastern 737 "Missing Contact"

High altitude stall ? While it's too early to speculate about the cause(s) of this accident, a stall looks rather unlikely. Based on FR24 data, the speed remains very constant, as the rate of descent. A stall would require a drop in airspeed, followed by a rapid onset of a descent, followed by sign...

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by hitower3
Tue Mar 15, 2022 6:24 pm
Forum: Technical/Operations
Topic: Sahara dust over Europe
Replies: 6
Views: 2659

Re: Sahara dust over Europe

Quick answer: most likely not at all. This phenomenon happens every now and then, typically several times a year. While the chemical composition _might_ be somewhat similar to volcanic ash, the concentration is a lot lower. Also, Aircraft are regularly operating in desertic places, where flying sand...

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by hitower3
Fri Mar 11, 2022 9:06 am
Forum: Civil Aviation
Topic: Russian Invasion of Ukraine - Civil Aviation Related *Discussion* Thread
Replies: 782
Views: 246047

Re: Russian Invasion of Ukraine - Civil Aviation Related *Discussion* Thread

Dear all, Someone in the area of Kyev seems to have fun with an ADS-B transponder: https://www.flightradar24.com/FCKPUTIN/2b196bf0 We can observe the (in fact destroyed) An-225 flying circles around the capital and displaying an identification code in the form of an insult against the Russian leader...

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by hitower3
Thu Mar 03, 2022 8:55 am
Forum: Technical/Operations
Topic: Flying a G-II with full reverse thrust? (Shuttle Training Aircraft)
Replies: 3
Views: 1669

Re: Flying a G-II with full reverse thrust? (Shuttle Training Aircraft)

Dear ehbowen, Highly interesting, thank you. And this is how it actually looked like flying the brick simulator aircraft: https://www.youtube.com/watch?v=z44bEm9MO6w There was also an episode of "Flying heavy metal" documentary series about this aircraft, but I could not find it. Kind rega...

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by hitower3
Tue Feb 15, 2022 8:00 pm
Forum: Civil Aviation
Topic: Lufthansa Group News and Discussion Thread - 2022
Replies: 410
Views: 126820

Re: Lufthansa Group Fleet Thread - 2022

My guess is that OS will either get some older A330 from Swiss or LH or 787, depending on how good they perform. I don't know if it's "worth" it to invest expensive 787 in a low yield market like VIE. While the capacity and economics (capital and operating costs) of a used A330 from Swiss...

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by hitower3
Tue Feb 15, 2022 1:59 pm
Forum: Civil Aviation
Topic: Lufthansa Group News and Discussion Thread - 2022
Replies: 410
Views: 126820

Re: Lufthansa Group Fleet Thread - 2022

B77W might be too big for Austrian. I can't think of any OS long haul destination can absorb the B77W capacity. Hello, I really can't see where else these 777W could go inside the LH group. Perhaps as P2F conversion to LH Cargo in a few years? I am still puzzled why LX did not take over a dozen of ...

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by hitower3
Thu Feb 10, 2022 3:02 pm
Forum: Technical/Operations
Topic: What Is the Minimum Runway Width for Airline Service?
Replies: 16
Views: 3142

Re: What Is the Minimum Runway Width for Airline Service?

According to Airbus, the 320 series can operate from runways as narrow as 30m / 98,4ft.
So yes, 100ft is possible.

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by hitower3
Wed Feb 09, 2022 4:51 pm
Forum: Civil Aviation
Topic: Airbus cancels two A350-1000 for Qatar Airways
Replies: 76
Views: 17390

Re: Airbus cancels two A350-1000 for Qatar Airways

At least these two parked NTU QR 350-1000s will get a fresh coat of paint...

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by hitower3
Wed Feb 09, 2022 4:41 pm
Forum: Civil Aviation
Topic: Third and fourth freedoms of air
Replies: 8
Views: 1633

Re: Third and fourth freedoms of air

Ziyulu wrote:
I don't understand the difference between third and fourth.


It's almost the same, except that 3rd is the flight from home country to a remote country, whereas the return flight involves the 4th.
I agree that granting the 3rd makes little sense without the 4th.

Hendric

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by hitower3
Mon Feb 07, 2022 12:01 pm
Forum: Technical/Operations
Topic: A380 Reverse Thrust On Landing
Replies: 29
Views: 4246

Re: A380 Reverse Thrust On Landing

Never knew the KC-46 has no reverse thrust, do you know why? My guess would be about mission profile: The KC-46 being a tanker aircraft, it will usually come back very light after the mission, since it did not only consume most of its trip fuel, but also its payload. Less landing weight means less ...

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by hitower3
Sat Feb 05, 2022 10:06 am
Forum: Technical/Operations
Topic: SAS flying an A321LR CPH-IAD
Replies: 25
Views: 3776

Re: SAS flying an A321LR CPH-IAD

From a regulatory standpoint, would they need an augmented crew for that flight?

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by hitower3
Wed Feb 02, 2022 3:51 pm
Forum: Technical/Operations
Topic: A380 Reverse Thrust On Landing
Replies: 29
Views: 4246

Re: A380 Reverse Thrust On Landing

Interesting, the military connection. I was amazed seeing Canada's RCAF C-17's, up close and personal, to see not only the fan thrust was "reversed" but the core thrust was blocked during landing ops. Given the ratio of 75/25 for fan/core thrust production on landing, that extra 25% block...

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by hitower3
Mon Jan 31, 2022 7:33 am
Forum: Technical/Operations
Topic: Uncommanded thrust reversal deployment
Replies: 39
Views: 3348

Re: Uncommanded thrust reversal deployment

Hello, This is a rather challenging scenario that - at least as far as I recall - has never happened in reality. If an engine running at takeoff thrust suffers an uncommanded TR deployment (there are effective safeguards to prevent this, but let's assume this still happens), this will cause a very s...

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by hitower3
Wed Jan 26, 2022 1:36 pm
Forum: Technical/Operations
Topic: Night Curfew vs. Emergency Landing
Replies: 11
Views: 2479

Night Curfew vs. Emergency Landing

Dear a.netters, I am living not too far away from Vienna airport (VIE / LOWW) in Austria. This airport observes a night curfew between 23:00 and 6:00 local time every night. However to my knowledge, the curfew does not apply for emergency landings. I wonder what kind of preparations the airport (or ...

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by hitower3
Fri Jan 14, 2022 12:03 pm
Forum: Technical/Operations
Topic: Status of electric pushback tugs at MAD (Madrid)?
Replies: 12
Views: 4455

Re: Status of electric pushback tugs at MAD (Madrid)?

Dear all,

Electric drive would be great for tugs. Max. torque at 0rpm, heavy batteries provide grip, braking energy fed back into the batteries.
The environmental benefit comes on top.

Hendric

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by hitower3
Fri Jan 14, 2022 11:50 am
Forum: Technical/Operations
Topic: aerospatiale A200 from the 1980'?
Replies: 13
Views: 2000

Re: aerospatiale A200 from the 1980'?

Dear all, I once tried to find out if there was any "Dassault Mercure genes" to be found in the A320 genealogy. I researched the fuselage diameter and found different values for the A320 (3,95m / 13ft) and the Mercure (3,89m / 12ft10in), which is an indication of unrelated designs. With re...

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by hitower3
Thu Jan 13, 2022 11:25 am
Forum: Technical/Operations
Topic: A321LR flight level?
Replies: 9
Views: 2308

Re: A321LR flight level?

Obviously I am not a pilot. Nevertheless, I have analyzed some A321LR flights, specially the long range flights Air Portugal operates, and I have noticed that the flight level is usually below FL340. Is it possible to say that the A321 LR or the future XLR is not able to climb to a higher altitude ...

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by hitower3
Wed Jan 05, 2022 5:27 pm
Forum: Civil Aviation
Topic: Airbus A350 Production/Delivery Thread - 2022
Replies: 308
Views: 104220

Re: Airbus A350 Production/Delivery Thread - 2022

283t is 3 tons more than the highest MTOW I was aware of until now.
This can be a significant upgrade for ULH operations, with roughly half an hour of additional endurance.

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by hitower3
Thu Dec 30, 2021 11:12 am
Forum: Civil Aviation
Topic: Should passengers report possible maintenance issues to crew
Replies: 71
Views: 10454

Re: Should passengers report possible maintenance issues to crew

Dear all, I would also agree with the consensus that as a PAX we should report any relevant observations to the FA as appropriate. Once on a flight with Austrian on a F100, I looked out of the window during a night time approach to VIE and observed an object - likely a bird - hitting or almost hitti...

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by hitower3
Thu Dec 30, 2021 10:01 am
Forum: Technical/Operations
Topic: Altimeters, static pressure, and lift
Replies: 48
Views: 2894

Re: Altimeters, static pressure, and lift

Dear all, This thread is a highly interesting read for me, thanks to all contributors. I have the impression that the debate over the origin of lift generation through pressure differential or flow deflection is somehow similar to the debate over the the particle or wave nature of light. It's a dual...

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by hitower3
Mon Dec 27, 2021 5:12 pm
Forum: Technical/Operations
Topic: EL AL Johannesburg route 720B 1968
Replies: 4
Views: 1246

Re: EL AL Johannesburg route 720B 1968

Dear dennys, TLV-JNB is shy of 3'500nm according to gcmap. http://www.gcmap.com/mapui?P=tlv-jnb&MS=wls&DU=nm Wikipedia states the range of the 720B at 3'200nm. https://en.wikipedia.org/wiki/Boeing_720#Specifications This would make me believe that a 720B would struggle a lot to cover this di...

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by hitower3
Thu Dec 23, 2021 11:08 am
Forum: Civil Aviation
Topic: Airbus A321XLR Development Production Testing Thread - 2021
Replies: 238
Views: 69138

Re: Airbus A321XLR Development Production Testing Thread - 2021

https://twitter.com/Tobias_Gudat/status/1472970559189397507?t=tYACw9-Y_4GPhQnciBN7mg&s=19 If I am not mistaken, I see a double slotted inboard flap on the picture. Wasn't it told publicly that the XLR would receive a flap upgrade in the form of an evolved single-slot design? Kind regards, Hendric

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by hitower3
Sat Nov 27, 2021 11:25 am
Forum: Technical/Operations
Topic: 787 Cruise Mach at Cost Index 300
Replies: 10
Views: 2378

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: 10649

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: 10649

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: 2818

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: Non-Aviation
Topic: 121.5 now a political forum in US
Replies: 63
Views: 10657

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: 3336

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: 2413

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: 2413

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: 5481

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: 5481

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: 1103

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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