Search found 550 matches

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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: 1405

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: 1405

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: 187
Views: 34295

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: 187
Views: 34295

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: 22627

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: 187
Views: 34295

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: 187
Views: 34295

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: 187
Views: 34295

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: 6849

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: 6849

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: 1092
Views: 166634

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: 2456

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: 2244

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: 2062

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: 2062

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: 68
Views: 11356

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: 20
Views: 2642

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: 298
Views: 121116

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: 2416

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: 1607

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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by gloom
Wed Mar 31, 2021 2:32 pm
Forum: Technical/Operations
Topic: Sourcing old electronics for new planes
Replies: 8
Views: 1607

Re: Sourcing old electronics for new planes

I cannot imagine Intel/Arm/etc will run a factory to make a few hundred chips .. a few hundred thousand would seem low to them. Most of chips are still available somewhere. A chip I ran first assembler on (8051, microcontroller back from 80s combining 8bit core, ROM and RAM, ports etc on one chip) ...

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by gloom
Tue Mar 16, 2021 6:36 am
Forum: Technical/Operations
Topic: Why are engines on planes changed so often?
Replies: 18
Views: 3824

Re: Why are engines on planes changed so often?

Do lessors also swap engines based on time on wing? I do know owners do that to their own engines to avoid both: maintenance check on significant number of engines at one time, and balance wear&tear between different planes flying different routes. Aaaah, and they also match engines closing to m...

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by gloom
Sun Feb 28, 2021 10:33 am
Forum: Technical/Operations
Topic: Airbus planes seeming to switch off engines on hold pattern
Replies: 16
Views: 4194

Re: Airbus planes seeming to switch off engines on hold pattern

Starlionblue wrote:
- It's autothrust on Airbus, not authothrottles.
- It's thrust control, not throttle.


I stand corrected. :white: Thanks.

Cheers,
Adam

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by gloom
Sun Feb 28, 2021 7:17 am
Forum: Technical/Operations
Topic: Airbus planes seeming to switch off engines on hold pattern
Replies: 16
Views: 4194

Re: Airbus planes seeming to switch off engines on hold pattern

Impossible. What you refer to, is most likely just a thrust reduction managed by auto-throttle system. When speed is managed (and while in hold, there's usually constant speed requirement), during turns plane tends to move up/down a bit. And throttles will then adjust thrust to maintain speed as set...

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by gloom
Fri Feb 26, 2021 9:49 am
Forum: Civil Aviation
Topic: Another B777 engine trouble
Replies: 15
Views: 4238

Re: Another B777 engine trouble

Polish press reported 4520 as flight number. FR24 says it's a EI-GET, 773ER. GE engines.

Cheers,
Adam

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by gloom
Sat Feb 20, 2021 9:47 am
Forum: Technical/Operations
Topic: Why No Low Airways Over Northern Ohio & Parts of PA and NY
Replies: 12
Views: 3288

Re: Why No Low Airways Over Northern Ohio & Parts of PA and NY

What is the plan for control outage? Yes, radar or ADS-B is well proven but there must be some plan for failure. What do you mean control outage? I guess all the plans to handle different failure scenarios, where ATC services are affected. Radar(s) not operational, fire at ATC rooms, power outage a...

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by gloom
Sat Feb 20, 2021 7:24 am
Forum: Technical/Operations
Topic: Why No Low Airways Over Northern Ohio & Parts of PA and NY
Replies: 12
Views: 3288

Re: Why No Low Airways Over Northern Ohio & Parts of PA and NY

What is the plan for control outage? Yes, radar or ADS-B is well proven but there must be some plan for failure. I guess it depends on countries involved - Eurocontrol is a coordination/R&D organization, but does not influence individual countries (yet), so less than FAA. I talked about it a fe...

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by gloom
Fri Feb 19, 2021 6:45 am
Forum: Technical/Operations
Topic: Why No Low Airways Over Northern Ohio & Parts of PA and NY
Replies: 12
Views: 3288

Re: Why No Low Airways Over Northern Ohio & Parts of PA and NY

Also, a bunch of countries in Eastern Europe don't have any low level airways altogether. In fact in some countries, like Austria and Hungary, they don't have high level routes either. They've gotten rid of airways entirely. Are you aware of the concept called FRA (Free Route Airspace) in Europe? h...

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by gloom
Fri Feb 19, 2021 6:29 am
Forum: Civil Aviation
Topic: FedEx and Sikorsky: Beginning Trial on Single Pilot Ops for Cargo
Replies: 108
Views: 12064

Re: FedEx and Sikorsky: Beginning Trial on Single Pilot Ops for Cargo

I thought that the space shuttle used this 2 out of 3 system as well. So there is a lot of experience with it. Space Shuttle logic employed 5 independent units. 4 were voting, fifth was resolution unit, if (and when) voting units split 2:2. What scares me off, is that it happened a few times (need ...

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by gloom
Thu Feb 18, 2021 6:54 am
Forum: Technical/Operations
Topic: Aircraft thrust
Replies: 4
Views: 1271

Re: Aircraft thrust

Where can one find a aircraft thrust rating using the aircraft tail number or Boeing serial number. Just to add extra explanation: it's possible to locate exact engine version. However, there are models where a single type (with an exchange of EEC) can change its thrust rating between a number of p...

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by gloom
Thu Feb 18, 2021 6:45 am
Forum: Technical/Operations
Topic: When did GPS become mainstream in commercial aviation?
Replies: 40
Views: 2855

Re: When did GPS become mainstream in commercial aviation?

This is false, VFR only aircraft are not GPS dependent. They are outside references dependent only hence their requirements to remain VFR. Plenty of non-IFR certified planes flying without radios and/or GPS units. What I meant was if they have lateral nav equipment. If they do, the thing is GPS dep...

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by gloom
Wed Feb 17, 2021 6:21 am
Forum: Technical/Operations
Topic: When did GPS become mainstream in commercial aviation?
Replies: 40
Views: 2855

Re: When did GPS become mainstream in commercial aviation?

Request 090 heading, direct ABC VOR when able... All using the VFR handheld, totally legal... I know the story behind, but I couldn't resist to ask. Which one requires GPS? Fly heading, or direct to? ;) Back to topic, I agree with Starlion - the core is inertial platform. It will constantly realign...

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by gloom
Tue Feb 16, 2021 12:17 pm
Forum: Technical/Operations
Topic: Can engines be too big?
Replies: 20
Views: 2789

Re: Can engines be too big?

The 787-8 could easily remove 10t of empty weight Not really. And I do not mean it cannot be done. If it would be done, it's: a) not 787 anymore, be it 8 or whatever else - not in the meaning we have now, b) it would be awfully expensive, since range of work (and certification) is close to building...

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by gloom
Mon Feb 15, 2021 6:32 am
Forum: Technical/Operations
Topic: Powering systems inside a hangar
Replies: 14
Views: 1877

Re: Powering systems inside a hangar

Just a quick add-on question. For aircraft to be powered up - do you need to switch battery on, or will external power completely do the trick? I could imagine some sort of protection on the battery circuit preventing that, but Bat/GPU running parallel with switch on each seems a simpler solution. A...

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by gloom
Fri Feb 12, 2021 6:27 am
Forum: Technical/Operations
Topic: ULH one stop
Replies: 4
Views: 1397

ULH one stop

I was wondering about ULH distances - or maybe UULH - as a side note to MEL-LHR idea from Qantas. If you can't reach destination direct, you will usually do the trip (as a passenger) with one stop. From a passenger perspective, the preferences would not be clear, as some prefer to have a longer slee...

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by gloom
Tue Feb 02, 2021 11:22 am
Forum: Technical/Operations
Topic: How do airlines decide which manufacturer to buy from
Replies: 3
Views: 1389

Re: How do airlines decide which manufacturer to buy from

The general answer I've gotten is that there are simply too many little reasons why it's one vs the other. Agreed. There is a myriad of reasons, all between performance so far, performance expected, MX cost, human cost, financial model and availability, model availability, even subjective (like wha...

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by gloom
Mon Feb 01, 2021 11:40 am
Forum: Civil Aviation
Topic: Updated: QR finds surface coating cracks in early build A350
Replies: 300
Views: 36072

Re: Updated: QR finds surface coating cracks in early build A350 (not structural).

Purely speculative but does Airbus want a closer look to see if there is a systemic problem? Unlikely. Since there were reports the problem is a repair derivative, I'd say hardly any reason to believe Lufthansa is coming for structure integrity chech. Plus, if Airbus wanted to check for a systemic ...

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by gloom
Sat Jan 23, 2021 7:55 am
Forum: Technical/Operations
Topic: Why do some airliners seemingly have two sets of EFBs?
Replies: 25
Views: 3240

Re: Why do some airliners seemingly have two sets of EFBs?

In a rather short time those devices will go all wireless, not have any cables to plug in. I don't expect that. You'd need to build a security zone then, electromagnetically isolated. I think it would be more like option to put a dedicated cradle for EFB. And an arm for that perhaps, so you can mov...

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by gloom
Sat Jan 23, 2021 7:47 am
Forum: Civil Aviation
Topic: QF - Project Sunrise
Replies: 405
Views: 71882

Re: QF - Project Sunrise

I was wondering about one thing. 321 and its flights on the edge of the envelope showed us a development way I don't think we've seen before. But we might see afterwards. Evolving design went from pax+cargo on regular range, then we saw ACTs, LR on Neo design, and then XLR. So basically "less c...

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by gloom
Thu Jan 21, 2021 6:14 am
Forum: Technical/Operations
Topic: Why do some airliners seemingly have two sets of EFBs?
Replies: 25
Views: 3240

Re: Why do some airliners seemingly have two sets of EFBs?

some sort of connectivity to the FMS Already happening on new bizjets like the G7500. Hi Galaxyflyer, I left only important part out of PinkMachine response. Are these just EFBs, or really plugged in to FMS? Being able to plug "anything" having right socket to FMS seems like quite a breac...

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by gloom
Wed Jan 20, 2021 2:50 pm
Forum: Technical/Operations
Topic: Why do some airliners seemingly have two sets of EFBs?
Replies: 25
Views: 3240

Re: Why do some airliners seemingly have two sets of EFBs?

thepinkmachine wrote:
I'm really looking forward to the time when manufacturers ditch their OEM EFB and provide an iPad socket instead, with some sort of connectivity to the FMS


I guess that never happens, for safety reasons. You don't want any device using specified port/socket to be able to plug in.

Cheers,
Adam

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by gloom
Sun Jan 17, 2021 11:45 am
Forum: Technical/Operations
Topic: Spped drop on climb/cruise
Replies: 3
Views: 1682

Spped drop on climb/cruise

I was wondering as a side thought on SJ182 catastrophe. Assuming the thrust is gone for any reason, while on standard climb, or in cruise, what would likely be the "reaction time"? I know there's myriad of different situations, including (or not) AP changing attitude to compensate, and the...

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by gloom
Sun Jan 17, 2021 11:36 am
Forum: Technical/Operations
Topic: “Line up and wait”
Replies: 38
Views: 4106

Re: “Line up and wait”

Fairly common across Europe. One day in Lisbon, hazy, I got that clearance only had the traffic’s lights in sight. Not a fan. There's a reason why it's so popular. Gives you shorter takeoff (some 10-20secs from rwy threshold vs runway). However, in usual conditions it is always a conditional. Usual...

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by gloom
Sat Jan 16, 2021 4:15 pm
Forum: Technical/Operations
Topic: How often do airliners perform visual approaches in good weather?
Replies: 11
Views: 1949

Re: How often do airliners perform visual approaches in good weather?

Outside North America, much less so—approaches are nearly all instrument clearances. I can only tell for Europe, still it depends very much on airport. If you have busy airport, that's easier to manage traffic in on ILS and STAR. Still, it's not that rare to hear "airport on 11 o'clock, ready ...

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by gloom
Sun Jan 10, 2021 8:03 am
Forum: Technical/Operations
Topic: 2 vs 4 engines
Replies: 128
Views: 12658

Re: 2 vs 4 engines

Starlionblue wrote:
The A340 had about 35 tonnes higher MTOW, and significantly longer range.


Original difference was even bigger. MTOW of initial versions of A330 was 212tons, 340 was maxed at 276tons. That's over 60 tons difference, almost 65.

Cheers,
Adam

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by gloom
Tue Jan 05, 2021 1:10 pm
Forum: Civil Aviation
Topic: Updated: QR finds surface coating cracks in early build A350
Replies: 300
Views: 36072

Re: QR finds composite cracks in early build A350

Again, you are hung up on traditional A, C, etc terminology. Sorry, have to agree with Zeke. If I found a way to split tasks usually made on C check, in a way that I do 1/6th every year, so all tasks usually done on C check are done every 6 years, but not at one time, called C (but instead I go wit...

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by gloom
Sun Dec 20, 2020 6:47 am
Forum: Technical/Operations
Topic: Coffin Corner/High Altitude and Excess Thrust vs "Excess" Wing Area
Replies: 19
Views: 2401

Re: Coffin Corner/High Altitude and Excess Thrust vs "Excess" Wing Area

Not to be pedantic, but I will be, your generalization is not quite true. Quite possible. I have been learned to accept "statistic are always wrong when we move to a single event". And your experience certainly allows you to know far more than I will ever learn. Still: I don't know where ...

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by gloom
Sat Dec 19, 2020 7:21 am
Forum: Technical/Operations
Topic: Coffin Corner/High Altitude and Excess Thrust vs "Excess" Wing Area
Replies: 19
Views: 2401

Re: Coffin Corner/High Altitude and Excess Thrust vs "Excess" Wing Area

G/S is ground speed. No increase in performance is a combination of an increased G/S as the result of winds at the higher altitude, decreased fuel flow. Close, but not yet. General rule: the higher you go, the lower GS, as speed of sound desceases - but only until ~40.000ft. Higher, the sound speed...

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by gloom
Fri Dec 18, 2020 6:29 am
Forum: Technical/Operations
Topic: Coffin Corner/High Altitude and Excess Thrust vs "Excess" Wing Area
Replies: 19
Views: 2401

Re: Coffin Corner/High Altitude and Excess Thrust vs "Excess" Wing Area

Just curious. Which is more important for sustained high altitude flight and improving coffin corner performance? Wing area or excess thrust? Guess it was already explained a couple of times. Wing area. Thrust is already there, since you need it at takeoff. And with wings being better and better (s...

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by gloom
Wed Dec 09, 2020 9:30 pm
Forum: Technical/Operations
Topic: DL & UA on Johannesburg/JNB service aircraft performance (hot & high)
Replies: 49
Views: 7539

Re: DL & UA on Johannesburg/JNB service aircraft performance (hot & high)

By my eyeball on the Boeing ACAPs for the 787 with the high thrust engines on a standard day and dry runway the 787 can take off on the longest runway at 530 000lb or around 241T so nowhere near MTOW. ACAPS says it's even lower, I'd estimate for 237-239T (at ISA+15, approx 5500ft altitude, 14.5k ft...

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