Search found 580 matches

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by gloom
Sun Nov 28, 2021 8:20 am
Forum: Civil Aviation
Topic: Updated: Reuters: Airbus launches A350 freighter
Replies: 1827
Views: 306357

Re: Updated: Reuters: Airbus launches A350 freighter

The problem with upping the MTOW on the 777XF ... It would most certainly be able to carry the same 109 tons the same distance as an A350F but, and here’s the crux, weighing 50 tons more and burning 5-10% more fuel to get the job done. Not a winning proposition. Correct, but there's another itch th...

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by gloom
Sat Nov 27, 2021 9:16 pm
Forum: Technical/Operations
Topic: 787 Cruise Mach at Cost Index 300
Replies: 10
Views: 1049

Re: 787 Cruise Mach at Cost Index 300

I don’t know any airline that flies around at a seated Mach number in a modern aircraft unless it’s an ATC speed constraint. Everyone I talk to fly ECON speeds which are a function of CI, weight, altitude, and environmental conditions. I know LH was using fixed Ma at least a few years ago on their ...

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by gloom
Sat Nov 27, 2021 9:03 am
Forum: Technical/Operations
Topic: 787 Cruise Mach at Cost Index 300
Replies: 10
Views: 1049

Re: 787 Cruise Mach at Cost Index 300

So how fast is this airplane going at CI300 vs. say CI50? CI is not about speed, it's all about cost (fuel consumption) as the name says. Depending on wind (tail/head, speed), it will be different. Typically, 300 is asking for high speed standard cruise (.86, as you say), low CI (say 30s) will give...

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by gloom
Sun Nov 21, 2021 7:51 am
Forum: Civil Aviation
Topic: Airbus A350 Production/Delivery Thread - 2021
Replies: 461
Views: 186368

Re: Airbus A350 Production/Delivery Thread - 2021

Question. First 280T was MSN #216, are all -900’s manufactured after also 280T. Thanks. One remark first - A350 line was already running full speed at that time, so depending on MSN/completion date, there could be a number completed after, and not 280T. Having said that, any A350 after MSN 219 is a...

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by gloom
Mon Nov 15, 2021 7:29 pm
Forum: Civil Aviation
Topic: Tim Clark hinting at a possible Emirates order review?
Replies: 83
Views: 15945

Re: Tim Clark hinting at a possible Emirates order review?

He can't move ahead of others in the Airbus queue and start replacing those with A351s in any appreciable number before then can he? Talking about appreciable numbers, A350 line is running now at what, 7/month I believe. What will be the start of 777X? Airbus managed to get just over 10 350s first ...

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by gloom
Fri Nov 12, 2021 7:30 am
Forum: Civil Aviation
Topic: Qatar Airways has grounded 13 A350’s at the request of the Qatar Aviation regulator
Replies: 483
Views: 95316

Re: Qatar Airways has grounded 13 A350’s at the request of the Qatar Aviation regulator

I suspect that even the paint was not expected to fail in 4.3 years in normal service. Sure thing. Yet, it's not like normal conditions. There are some early frames, that could've been investigated outside of Qatar. OH-LWA still flying, right? And it's older than at least few of the grounded Qatar ...

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by gloom
Tue Nov 09, 2021 8:09 pm
Forum: Technical/Operations
Topic: Going higher
Replies: 3
Views: 965

Going higher

Hello, I've only just got a link for an interesting data stats on Eurocontrol website: https://www.eurocontrol.int/publication/eurocontrol-data-snapshot-21-aircraft-flying-higher-more-efficiently-and-sustainably Hope you will all enjoy. STill, there's more to come, isn't there? With data at hand, an...

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by gloom
Sun Oct 10, 2021 2:05 pm
Forum: Technical/Operations
Topic: Could flap operation be automated?
Replies: 18
Views: 1810

Re: Could flap operation be automated?

I was wondering about this since flap movement is tied to variables like weight and speed. Could flight deck automation remove from pilots the task of lowering and raising flaps based on aircraft configuration? Yes, it is possible. No, it is not welcome. And not for a "human don't like automat...

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by gloom
Fri Oct 08, 2021 6:49 pm
Forum: Technical/Operations
Topic: EGLL SID Altitude Constraints
Replies: 7
Views: 857

Re: EGLL SID Altitude Constraints

Do these constraints exist in real-world ops and pilots adhere to them? Yes, they are. Check side-by-side SIDs and STARs, or see the traffic on FR24. Arriving traffic is limited to 7000, while departures are 6000 limited. As these cross, and once those crossing points are cleared, you're allowed to...

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by gloom
Wed Oct 06, 2021 8:40 pm
Forum: Technical/Operations
Topic: Circling to Land in an Airliner. JAC
Replies: 16
Views: 1770

Re: Circling to Land in an Airliner. JAC

If you don’t have visual conditions you can’t circle. Exactly this. I was also taught, that at any time during circling you loose visual to runway, you break off the approach and go around. This is - as mentioned since the start - low, fast, and prone to mistakes. It's perfectly safe, but probably ...

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by gloom
Mon Oct 04, 2021 8:18 pm
Forum: Technical/Operations
Topic: 747-8 engine choice
Replies: 46
Views: 3993

Re: 747-8 engine choice

bigb wrote:
I guess I was looking for optimal cruise not max being tucked in the coffin corner.


Increasing cruise also increases max weight a bit (check .80 vs .82 cruise differences).

Still, it's only 242t bird that cannot reach 330 as optimum. 233t birds are off to 330 with no problem at all.

Cheers,
Adam

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by gloom
Mon Oct 04, 2021 6:52 pm
Forum: Technical/Operations
Topic: 747-8 engine choice
Replies: 46
Views: 3993

Re: 747-8 engine choice

I find it hard that a A330 at Max Gross will make FL330 initially I could be wrong though. Usually FL310 is what I normally get on a max gross 747 doing a transpac with stepping up to FL330 after a few hours in flight. Depends on weight config - we know this concept of flex MTOW. However, there is ...

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by gloom
Sun Oct 03, 2021 8:52 pm
Forum: Technical/Operations
Topic: 747-8 engine choice
Replies: 46
Views: 3993

Re: 747-8 engine choice

kitplane01 wrote:
What I don't know is if B747s cruise at or very near their Mach limit. How much lower than Mmo is a B747s cruise speed?


Typical cruise: 0.85 (some airlines will fly a bit faster, accepting increased a tad fuel burn, up to 0.86).
Mmo: 0.9

Cheers,
Adam

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by gloom
Sun Oct 03, 2021 7:54 am
Forum: Technical/Operations
Topic: 747-8 engine choice
Replies: 46
Views: 3993

Re: 747-8 engine choice

If you go too high, you will not have enough engine thrust to maintain the optimum indicated air speed and so you have to increase your AoA above the optimum value. But with larger engines you could maintain this optimum air speed higher up. With larger engines you can maintain the optimum IAS and ...

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by gloom
Sun Oct 03, 2021 6:26 am
Forum: Technical/Operations
Topic: 747-8 engine choice
Replies: 46
Views: 3993

Re: 747-8 engine choice

You wrote "optimum altitude" and not "maximum altitude" but for recent technology jetliners flying to maximum range, that's just about the same thing because the thinner air lets you go faster for the same thrust. No, not really. Optimum altitude is an altitude where a given fra...

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by gloom
Sat Oct 02, 2021 8:10 pm
Forum: Technical/Operations
Topic: In a circling approach, how much of a straight path is required before landing.
Replies: 20
Views: 1517

Re: In a circling approach, how much of a straight path is required before landing.

Just to clarify not to confuse the terms. While a visual approach is not a standard instrument approach procedure it is conducted by an aircraft on an instrument flight plan. I believe your reference to "VFR" is not referring to a VFR flight plan, but an aircraft operating on an instrumen...

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by gloom
Sat Oct 02, 2021 5:42 pm
Forum: Technical/Operations
Topic: In a circling approach, how much of a straight path is required before landing.
Replies: 20
Views: 1517

Re: In a circling approach, how much of a straight path is required before landing.

yes we (ATC) can assign a visual approach as well as the pilot can request it as well, but the pilot has to report the airport in sight and/or the preceded aircraft if they will be following one closely. A bit different at my country. You cannot directly offer VFR as ATC, as it's pilots to ask and ...

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by gloom
Sat Oct 02, 2021 5:33 pm
Forum: Civil Aviation
Topic: Ethiopian 777X or A350-1000 Deal Nears
Replies: 53
Views: 11909

Re: Ethiopian 777X or A350-1000 Deal Nears

It’s about the same. I don’t know if the higher thrust engines of the GE9X add to the hot and high discussion Not at all, given thrust/weight ratio is more or less the same (more thrust compensates weight difference). I'd say slight edge for A-bus here, since it has a ready-to-go product with sligh...

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by gloom
Sat Oct 02, 2021 6:53 am
Forum: Technical/Operations
Topic: 747-8 engine choice
Replies: 46
Views: 3993

Re: 747-8 engine choice

If you're saying a 747 with a bigger wing would likely have a higher maximum altitude (and lower top speed) I'll agree. But it is still the case that a 747 with more thrust could climb higher. Both right (assuming by speed you mean lower IAS, but Ma/TAS staying more or less same). But once you have...

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by gloom
Fri Oct 01, 2021 6:27 am
Forum: Technical/Operations
Topic: 747-8 engine choice
Replies: 46
Views: 3993

Re: 747-8 engine choice

I've never read wing-load-limited in any aerodynamic textbook, and I don't think they do the math in those terms. They don't. It's the construct to give a hint . But since you want some... Two important moments in flight that affect cruise level: 1. Capability to do final climb is (or could be) bot...

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by gloom
Thu Sep 30, 2021 7:32 pm
Forum: Technical/Operations
Topic: 747-8 engine choice
Replies: 46
Views: 3993

Re: 747-8 engine choice

For less development cost the 747-8 could have used a bleed-air version of the normal GE-nx, with more thrust (74,100 vs 65,000). This would have added 1308 lbs of extra engine weight, plus some pylon reinforcement. [...] Would this have allowed the 747-8 to fly higher, and therefore save fuel? Not...

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by gloom
Fri Sep 24, 2021 6:19 am
Forum: Technical/Operations
Topic: A couple of battery electric aircraft questions. 1 noise, and 1 cost.
Replies: 7
Views: 967

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

As for costs, itll be substantially cheaper to operate than fuel-powered planes, Not quite sure about it. Yes, the energy cost per flight would probably be cheaper. I fully expect MX to be cheaper, as both electric engines and batteries are less complicated and easier to replace/upgrade. However, t...

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by gloom
Sat Sep 11, 2021 6:22 am
Forum: Technical/Operations
Topic: Does the A220 have a PTU?
Replies: 2
Views: 1095

Re: Does the A220 have a PTU?

https://wwwapps2.tc.gc.ca/saf-sec-sur/2 ... BD_500.pdf

Cheers,
Adam
-->

Yes, it does.

Little goodie found during googling:
https://wwwapps2.tc.gc.ca/saf-sec-sur/2 ... BD_500.pdf

Cheers,
Adam

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by gloom
Fri Sep 10, 2021 2:54 pm
Forum: Technical/Operations
Topic: How did they decide where to put the VOR stations?
Replies: 30
Views: 3056

Re: How did they decide where to put the VOR stations?

There were plenty of single NDB approaches, no requirement for two beacons, but you’re correct in that two beacons, one near the airport could reduce the minimums. Lots eastern bloc countries used them, see Dubrovnik and USAF crash. In North America, we never saw two NDBs on approaches, just went t...

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by gloom
Fri Sep 10, 2021 5:29 am
Forum: Technical/Operations
Topic: How did they decide where to put the VOR stations?
Replies: 30
Views: 3056

Re: How did they decide where to put the VOR stations?

Back in the days, there were navigating beacons called NDB (Non Directional Beacons). They were the first radio approach devices, ADF was used for approach. But since they were non directional, you've had to have two for an approach to be accurate enough, more expensive to maintain etc. Then, the VO...

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by gloom
Fri Aug 27, 2021 5:53 am
Forum: Technical/Operations
Topic: CFM56 versus GTF
Replies: 3
Views: 1089

Re: CFM56 versus GTF

It's always a bad thing to consider engine's reliability based on own prejudices. Remember T1000 problems on 787? And, at the same time, TXWB doing records on IFSDs? How can a bad engine and a good engine be done next to each other? Yes, there were some teething issues on GTF. Still, PW took it's le...

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by gloom
Fri Aug 27, 2021 5:48 am
Forum: Technical/Operations
Topic: Can you expand on this quote on speed stability in the CV-880M to help me understand it better?
Replies: 11
Views: 1789

Re: Can you expand on this quote on speed stability in the CV-880M to help me understand it better?

I don't immediately see how the MAX issues were positive speed stability issue. Reread, he never said MAX was not positive speed stability. He said it showed how much not having such stability could be bad thing. And sure, MAX is positive speed, but issues with human-machine interface made its pitc...

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by gloom
Sun Aug 08, 2021 6:18 pm
Forum: Technical/Operations
Topic: long distance at low altitude
Replies: 14
Views: 2207

Re: long distance at low altitude

The FAA allows flight crews to fly up to 12499' in unpressurized aircraft without supplemental oxygen, Sec. 135.89 Pilot requirements: Use of Oxygen. (a) Unpressurized aircraft. Each pilot of an unpressurized aircraft shall use oxygen continuously when flying— (1) At altitudes above 10,000 feet thr...

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by gloom
Sun Aug 08, 2021 4:45 pm
Forum: Technical/Operations
Topic: long distance at low altitude
Replies: 14
Views: 2207

Re: long distance at low altitude

10,000 feet is not the assumed maximum safe altitude for non-pressurized aircraft. Depends on context. On unpressurized aircraft, usually above 10.000 ft pilot needs to use oxygen, at least according to FAA (and I think it's also a consensus across the world). https://www.faa.gov/pilots/safety/pilo...

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by gloom
Sun Aug 08, 2021 6:42 am
Forum: Technical/Operations
Topic: long distance at low altitude
Replies: 14
Views: 2207

Re: long distance at low altitude

About less than an hour ago I saw an plane flying at "relative low" altitude flying over Braunschweig Germany. According to flightradar24 it is a 777 VP-BJP from airline Nordwind flying from Paris to Moscow with 320kt at 9000ft. What the heck are they doing? What might be the reason for s...

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by gloom
Wed Aug 04, 2021 7:07 pm
Forum: Technical/Operations
Topic: Maximum gross weight step climb question
Replies: 20
Views: 2005

Re: Maximum gross weight step climb question

A heavy 787 will start at approximately FL330, not sure about the A350. 430 will only be reached by a fairly light 788 Right, my airline started with 788 and usually 380 as initial. Forgot it's not the case for 789/78J. 359 at MTOW goes straight to 370, IIRC. 430 is quite reachable - on HKG-HEL leg...

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by gloom
Wed Aug 04, 2021 6:11 am
Forum: Technical/Operations
Topic: Maximum gross weight step climb question
Replies: 20
Views: 2005

Re: Maximum gross weight step climb question

I am not sure if the same pronounced effect exists with newer generation 787's or A 350's. It does in terms of general step climb procedure. However, both 787 and A350 will start higher (approx 36,37 at MTOW) and will climb higher a bit quicker. In many cases up to F430, depending on ZFW. Cheers, A...

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by gloom
Mon Aug 02, 2021 8:16 pm
Forum: Civil Aviation
Topic: DL drops Cape Town from JNB-ATL schedule
Replies: 246
Views: 51533

Re: DL drops Cape Town from JNB-ATL schedule

codc10 wrote:
DAL is working to preferentially schedule its 3 (currently) higher gross weight 359s on the route.


No need to, in most cases. Usually due to high and hot, A359s are TOW limited, but below 275t. Subject to specific day condition, but most calculations were just above 270t TOW limit.

Cheers,
Adam

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by gloom
Mon Jun 21, 2021 7:35 pm
Forum: Civil Aviation
Topic: DL drops Cape Town from JNB-ATL schedule
Replies: 246
Views: 51533

Re: DL drops Cape Town from JNB-ATL schedule

It doesn’t matter what Vr is only GS matters. While I respect you reading from a book I have operational knowledge as a retired 787 Captain. Typical density altitude, temperature corrected for CPT would be around 7500ft for typical conditions when Delta departs (ISA+15, 5700ft pressure altitude). T...

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by gloom
Sun Jun 20, 2021 8:37 pm
Forum: Civil Aviation
Topic: CX Working With Airbus on Single-Pilot System for A350 With 2025 EIS
Replies: 254
Views: 23570

Re: CX Working With Airbus on Single-Pilot System for A350 With 2025 EIS

Two is the absolute minimum. Two engines, at least two systems of everything like hydraulics and generators. One pilot is not enough for an airliner. At least two are needed and often more than two are on duty for safety reasons. Not really. There used to be four engines, then three systems (in cas...

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by gloom
Sun Jun 20, 2021 7:27 pm
Forum: Civil Aviation
Topic: DL drops Cape Town from JNB-ATL schedule
Replies: 246
Views: 51533

Re: DL drops Cape Town from JNB-ATL schedule

Not saying you are wrong but I have to ask are you using Ground speed? Not really. It's all there on ACAPS. You can easily see where it reaches tire speed since from that moment longer runway does not increase TOW. The plane becomes tire speed limited. https://www.airbus.com/content/dam/corporate-t...

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by gloom
Sun Jun 20, 2021 6:33 pm
Forum: Civil Aviation
Topic: DL drops Cape Town from JNB-ATL schedule
Replies: 246
Views: 51533

Re: DL drops Cape Town from JNB-ATL schedule

On a hot day in DEN Iv been well below MTOW and right on Max tire speed. A350 would be on (standard) tire limit somewhere around 271t, going at ISA+15/8000ft altitude elevation. Tire limit is then hit, at around 4700m takeoff run. JNB rwy is 4400m long, 5700ft altitude, ISA+15 usually at time of de...

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by gloom
Sun Jun 20, 2021 9:58 am
Forum: Civil Aviation
Topic: DL drops Cape Town from JNB-ATL schedule
Replies: 246
Views: 51533

Re: DL drops Cape Town from JNB-ATL schedule

That said, the problem with JNB isn't range, it's tire speed-- you'll likely exceed your tire rating before you get off the ground. Even the 772LRs faced that problem, which is why DL/Boeing/Goodyear worked together to get a custom build certified for high-altitude ops like JNB. Not really. Tire sp...

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by gloom
Wed Jun 16, 2021 5:22 am
Forum: Technical/Operations
Topic: DFW - You're number ???? for takeoff!
Replies: 42
Views: 7208

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

Take a glimpse at KCLT (Charlotte, NC), at their peak hours. The line-up is massive. From Nation Guard C-17's to 777, A300, 737, A320, and the EMB-135/-145 and CRJ 700's Sure, but hopefully, it gets better. With progress on computer software, there will be more and more capacity-ahead planning on t...

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by gloom
Fri Jun 11, 2021 10:53 am
Forum: Technical/Operations
Topic: DFW - You're number ???? for takeoff!
Replies: 42
Views: 7208

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

Usually there's also a small hint on signs and your FMC. FMC is able to show calculated takeoff run (in m/ft). On the signs, approaching the taxiway, you'll see runway available at this taxiway (I think that's TODA, but not completely sure). You can easily check if it's enough. And pilot will always...

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by gloom
Fri Jun 11, 2021 5:21 am
Forum: Civil Aviation
Topic: Updated: Reuters: Airbus launches A350 freighter
Replies: 1827
Views: 306357

Re: A350F. Airbus looking to launch: Looking for customers

On an aircraft the size of the 77W it is very common for aircraft to have a few hundred kg difference in weight even if they were built right after each other. I'm curious - do you mean ones built to identical specifications? Yes, and true. It's a bit off topic, so I'll keep it short - I've seen B7...

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by gloom
Sat Jun 05, 2021 1:13 pm
Forum: Travel, Polls & Preferences
Topic: Potential A321XLR Routes
Replies: 16
Views: 2631

Re: Potential A321XLR Routes

Will the A321XLR have enough range in TATL so won't have to make fuel stops on some westbound flights during the winter months with 757's ? Depends. You can always do (as an airline) whatever reduction/overperformance you think is reasonable ;) Having said that: With standard west wind component ba...

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by gloom
Fri Jun 04, 2021 10:34 am
Forum: Technical/Operations
Topic: Cleared to land
Replies: 16
Views: 2407

Re: Cleared to land

To echo what atcdan wrote, anticipated separation in the U.S. certainly cuts down on radio transmissions particularly in a critical phase of flight when as a former tower controller I'd rather not be issuing a landing clearance as they approach the threshold. Just my opinion and it clearly works nu...

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by gloom
Sun May 23, 2021 7:55 pm
Forum: Technical/Operations
Topic: DL A359 MTOW?
Replies: 7
Views: 2298

Re: DL A359 MTOW?

N965UW wrote:
It's easy to reduce MTOW on paper, but can earlier builds get a higher MTOW on paper as well?


I don't have an answer for that. I'd risk that it's not only a paper upgrade, but also some hardware upgrade - but take it with a pinch of salt.

Perhaps someone else is able to confirm.

Cheers, Adam

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by gloom
Sun May 23, 2021 6:10 am
Forum: Technical/Operations
Topic: DL A359 MTOW?
Replies: 7
Views: 2298

Re: DL A359 MTOW?

Is the 280T variant the HGW variant? Probably not in the terms you consider HGW. A350 was built in batches. Current batch is using all improvements gathered so far, including 280T. Any A359 delivered nowadays is capable of 280T. Previous batches were built with different MTOW. First two (around 20 ...

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by gloom
Sat May 15, 2021 12:02 pm
Forum: Civil Aviation
Topic: LOT News and Discussion Thread - 2021
Replies: 82
Views: 16533

Re: LOT News and Discussion Thread - 2021

I’m booked on a Q400 in November from krk at 9:00am to waw connecting to lax on a 787-8 at 11:00am. I’m guessing there are lots of flights krk waw so I shouldn’t worry about making that connection. Or should I…? No need to worry. Plenty of EJets to deliver you there, if no Q400s avail. And if anyth...

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by gloom
Fri May 07, 2021 5:40 am
Forum: Technical/Operations
Topic: What is the minimum battery power density needed for a 2000nm range?
Replies: 21
Views: 3503

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

I am talking about 70% propulsion and 60% thermal, for a total of 40 or so. In a car? Phew. I do remember quite a buzz when Scania did an engine to achieve over 50%, some years ago. Generally, the thermal efficiency would be between 8-10% (naturally aspirated, old gas guzzlers) and 40+ % (diesels w...

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by gloom
Fri Apr 30, 2021 5:23 am
Forum: Civil Aviation
Topic: Airbus A350 Production/Delivery Thread - 2021
Replies: 461
Views: 186368

Re: Airbus A350 Production/Delivery Thread - 2021

FlightGlobal is reporting that Airbus has formally listed highest-weight A350-1000 at 319t. Since it's a long seen tradition from Airbus, two questions for anyone interested. 1. Do you think more raise(s) of MTOW are in the pipeline? 2. What would be the limit? I'd say there's quite a big chance (n...

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by gloom
Thu Apr 08, 2021 8:37 pm
Forum: Technical/Operations
Topic: APU "Electric" aircraft
Replies: 10
Views: 2513

Re: APU "Electric" aircraft

It seems that this idea had some momentum, but not really being pursued. For other transports that use this kind of solution (hybrid cars, diesel-electric locos), there's a benefit of running high-low profile. You accelerate, then cruise with low to no power. This means you can adjust all electric ...

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by gloom
Thu Apr 01, 2021 9:17 am
Forum: Technical/Operations
Topic: Sourcing old electronics for new planes
Replies: 8
Views: 1650

Re: Sourcing old electronics for new planes

Most is still old stock. Once you start talking small batch fabrication, it is not few bucks more, it is few hundreds more. It is few tenths, or few hundreds, depending on chip and sales. I've found new 8051 at 6 or 7 bucks a piece. When new, back in 80s they were at 4 bucks, I believe? As an examp...

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