Search found 19266 matches

by Starlionblue
Sun Jul 21, 2019 5:36 pm
Forum: Technical/Operations
Topic: Do pilots always understand ATC?
Replies: 39
Views: 6493

Re: Do pilots always understand ATC?

In my experience of flying around the world, level of standard phraseology has very little to do with how well pilots and controllers are able to understand each other. What really does have an effect is accents and how well both parties actually know English. For instance, when I’ve flown to Italy...

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by Starlionblue
Fri Jul 19, 2019 12:02 pm
Forum: Technical/Operations
Topic: Hydrogen Power
Replies: 5
Views: 459

Re: Hydrogen Power

johns624 wrote:
It was tried before...ever heard of the Hindenburg?


Bit of a difference with metal tanks instead of fabric cells, but yes.

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by Starlionblue
Fri Jul 19, 2019 5:28 am
Forum: Technical/Operations
Topic: Where do old/discontinued J class seat products end up?
Replies: 6
Views: 1010

Re: Where do old/discontinued J class seat products end up?

I'm surprised I have never seen old airline seats for sale. Maybe the seats are too contaminated with bleed air? I purchased cinema seats from the a cinema that had a high end premium cinema that also had food delivered. Very nice seats for my home cinema with two rows of 4. I purchased off a guy w...

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by Starlionblue
Thu Jul 18, 2019 8:09 am
Forum: Technical/Operations
Topic: Main reasons why long range planes are often used on rather short to medium routes?
Replies: 20
Views: 2086

Re: Main reasons why long range planes are often used on rather short to medium routes?

I think it is mostly explained by "burn fuel to carry fuel". Look at it this way: By the time you are six hours into an 8 hours flight, you've carried the remaining 10-12 tons of trip fuel for six hours. You've burned quite a bit of fuel carrying those 10-12 tons. It becomes an exponentia...

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by Starlionblue
Thu Jul 18, 2019 8:03 am
Forum: Technical/Operations
Topic: How long are typical flight attendant layovers on a daily flight for long haul?
Replies: 3
Views: 1325

Re: How long are typical flight attendant layovers on a daily flight for long haul?

How long is a piece of string? There are many variations, even within an airline. At my airline, for a daily long haul flight cabin crew typically get two days downroute, but it depends.On some destinations with multiple daily flights they get 1½ days, and on some destinations they have the option o...

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by Starlionblue
Wed Jul 17, 2019 5:01 am
Forum: Technical/Operations
Topic: Main reasons why long range planes are often used on rather short to medium routes?
Replies: 20
Views: 2086

Re: Main reasons why long range planes are often used on rather short to medium routes?

Those specific kgs tell the story. Thanks And raise a lot more new questions. 25 kg/ 90min = 133 kg/ 8 hours. So 200 kg/ 8 hours can't be explained with "burn fuel to carry fuel" alone. The lower cruise altitude seem to matter a lot. No wonder the range figures on paper are so extreme mor...

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by Starlionblue
Wed Jul 17, 2019 4:57 am
Forum: Technical/Operations
Topic: GE9X Record Breaker
Replies: 59
Views: 7646

Re: GE9X Record Breaker

[ Not sure if this is mentioned already but current regs don't allow you to "flex" your thrust in the middle of an emergency - i.e. OEI after V1. IIRC Boom is trying to convince regulators to allow for this change. The Boom plane would take off at something below max thrust and be program...

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by Starlionblue
Wed Jul 17, 2019 3:41 am
Forum: Technical/Operations
Topic: Solar batteries on airliner skin
Replies: 26
Views: 1705

Re: Solar batteries on airliner skin

Ha anyone taken into account that airliners use some of the compressed air for pressurization and the heat for heating the cabin and wing an engine inlet deicing? On an electric plane, you will need to use electric power for compressing air, cabin heating and deicing in absence of jet engine heat. ...

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by Starlionblue
Tue Jul 16, 2019 4:07 pm
Forum: Technical/Operations
Topic: fuselage strakes
Replies: 10
Views: 1805

Re: fuselage strakes

almost all would have resulted in changes jeopardising the common type rating. Strakes definitely do not threaten a common type rating. Just look how many aircraft variants feature strakes that were not present on the original model. The 737 is one of them - the Jurassic does not have the dorsal fi...

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by Starlionblue
Tue Jul 16, 2019 8:36 am
Forum: Technical/Operations
Topic: Solar batteries on airliner skin
Replies: 26
Views: 1705

Re: Solar batteries on airliner skin

ask again in twenty years for now no way to get considerable energie from them I'd guess that a 777 class aircraft with integrated thin film solar cells would have a peak performance of about 100 ~125KW.... so maybe worth 200 ~250 kg of JP on a 10 hour daylight flight. 500m2 of it could weigh than ...

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by Starlionblue
Tue Jul 16, 2019 7:50 am
Forum: Technical/Operations
Topic: Do pilots always understand ATC?
Replies: 39
Views: 6493

Re: Do pilots always understand ATC?

Live ATC is just one tool in learning how to talk on the radios (and an effective one too - especially in dealing with learning CRAFT in your IFR training). Until you are in the cockpit and keying up, you won't quite understand how the pacing goes (slow and fast). You have to remember that everyone...

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by Starlionblue
Tue Jul 16, 2019 3:10 am
Forum: Technical/Operations
Topic: Main reasons why long range planes are often used on rather short to medium routes?
Replies: 20
Views: 2086

Re: Main reasons why long range planes are often used on rather short to medium routes?

How much difference in climbing time and fuel consumption does a big plane get when its only going a short distance, and doesn't have to carry all that much fuel? Climbing time will be a bit faster, but more importantly initial altitude will be higher. Fuel burn will be very much lower. More than h...

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by Starlionblue
Mon Jul 15, 2019 3:17 pm
Forum: Technical/Operations
Topic: RAT Deployment and ETOPS
Replies: 28
Views: 2304

Re: RAT Deployment and ETOPS

GalaxyFlyer wrote:
Do any of the A or B planes RATs have a retract function? We did on the C-5 but didn’t on any of the BBD planes. Retract on the Lockheed was at a maximum of 180:KIAS, but it worked.


Not AFAIK. It's like disengaging an IDG. Red guard on the pushbutton and requires maintenance action.

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by Starlionblue
Mon Jul 15, 2019 3:11 pm
Forum: Technical/Operations
Topic: RAT Deployment and ETOPS
Replies: 28
Views: 2304

Re: RAT Deployment and ETOPS

Example: In the A330 if you get low level in both green and yellow, or both and blue, hydraulic systems, the RAT deploys automatically. That way you'll have one system left (yellow or blue) and the green system. Way better than just the blue or yellow. what happens in case of leak in green system? ...

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by Starlionblue
Mon Jul 15, 2019 12:10 pm
Forum: Technical/Operations
Topic: Main reasons why long range planes are often used on rather short to medium routes?
Replies: 20
Views: 2086

Re: Main reasons why long range planes are often used on rather short to medium routes?

Higher cruise altitude from the start is an advantage, but a "long haul aircraft" like the 777-300ER will not be thus limited on routes of a few hours. Also, the airline only cares about total cost, not about whether they could theoretically have somewhat lower burn 4000 feet higher. It's ...

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by Starlionblue
Mon Jul 15, 2019 3:37 am
Forum: Technical/Operations
Topic: Do pilots always understand ATC?
Replies: 39
Views: 6493

Re: Do pilots always understand ATC?

Live ATC is just one tool in learning how to talk on the radios (and an effective one too - especially in dealing with learning CRAFT in your IFR training). Until you are in the cockpit and keying up, you won't quite understand how the pacing goes (slow and fast). You have to remember that everyone...

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by Starlionblue
Mon Jul 15, 2019 3:31 am
Forum: Technical/Operations
Topic: RAT Deployment and ETOPS
Replies: 28
Views: 2304

Re: RAT Deployment and ETOPS

Isn't the RAT the last choice when both engines are out as well as the APU. A chance to land the glider? It is, but it is used in more situations. And even if you have the APU, you need the RAT for hydraulic power. Example: In the A330 if you get low level in both green and yellow, or both and blue...

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by Starlionblue
Mon Jul 15, 2019 3:22 am
Forum: Technical/Operations
Topic: Main reasons why long range planes are often used on rather short to medium routes?
Replies: 20
Views: 2086

Re: Main reasons why long range planes are often used on rather short to medium routes?

Anecdotally I think that climb and descent fuel burn evens out somewhat. You burn more fuel climbing for about 30 minutes, but you burn less fuel descending for about 30 minutes. Not saying the increase and decrease are precisely the same, of course, but the cruise average is roughly the same as the...

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by Starlionblue
Sun Jul 14, 2019 4:45 pm
Forum: Technical/Operations
Topic: Main reasons why long range planes are often used on rather short to medium routes?
Replies: 20
Views: 2086

Re: Main reasons why long range planes are often used on rather short to medium routes?

- If you have it, use it. There's no use an aircraft sitting on the ground for 16 hours between long hauls. - Many short routes have enough demand for large aircraft, e.g. HKG-TPE. Large aircraft tend to be built for long haul, but if you can fill a 777 consistently you'll still make more money than...

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by Starlionblue
Sun Jul 14, 2019 7:49 am
Forum: Technical/Operations
Topic: GE9X Record Breaker
Replies: 59
Views: 7646

Re: GE9X Record Breaker

It comes down to what operators want to pay for, which is why many engines have different thrust options. Sure, you could give the engine a higher thrust, and get more payload/range capacity. But that has to be weighed against the additional cost of maintenance. As I said, you don't "need"...

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by Starlionblue
Sun Jul 14, 2019 6:46 am
Forum: Technical/Operations
Topic: GE9X Record Breaker
Replies: 59
Views: 7646

Re: GE9X Record Breaker

If the engine can clearly produce more than rated thrust .... why is that not allowed during emergencies? Example: If some particular flight is weight limited because of engine-out concerns, and the engine had an extra bit of thrust just for emergencies, then one could increase weight. (Assuming en...

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by Starlionblue
Sun Jul 14, 2019 4:24 am
Forum: Technical/Operations
Topic: RAT Deployment and ETOPS
Replies: 28
Views: 2304

Re: RAT Deployment and ETOPS

If an engine is shut down, you still have the other engine, and you can get redundant electrical power from the APU. So no need for the RAT at all Although there have been RAT deployments even if both engines were operational, e. g. http://avherald.com/h?article=4b3d825b&opt=0 or http://avheral...

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by Starlionblue
Fri Jul 12, 2019 7:25 am
Forum: Technical/Operations
Topic: RAT Deployment and ETOPS
Replies: 28
Views: 2304

Re: RAT Deployment and ETOPS

Lpbri wrote:
787 RAT has its own hydraulic pump. 5000 psi @ 10 gpm.


I'm confused. BoeingGuy says the 787 RAT only provides electric power. Is there a dedicated emergency hydraulic pump powered by the RAT electrical supply?

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by Starlionblue
Fri Jul 12, 2019 4:51 am
Forum: Technical/Operations
Topic: RAT Deployment and ETOPS
Replies: 28
Views: 2304

Re: RAT Deployment and ETOPS

A330 is hydraulic only, powering the green hydraulic system. You get electric through the emergency generator, powered by the green system.

Either way, as BoeingGuy says, if you have the APU and one engine, you have plenty. Even with one engine and no APU, you will have most of the systems.

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by Starlionblue
Thu Jul 11, 2019 12:41 pm
Forum: Technical/Operations
Topic: Did/Does the 779X need a new wing? and does it need to be so big?
Replies: 21
Views: 3272

Re: Did/Does the 779X need a new wing? and does it need to be so big?

I still wonder what exactly bad in a345/6 compared to 77w. What exactly too heavy? Wing or fuselage? Thank for post, very interesting. I think t/o performance can be solved in 321xlr way by different flaps. Also, for me , 77x still looks like the only new plane being heavier than previous, or at le...

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by Starlionblue
Thu Jul 11, 2019 12:37 pm
Forum: Technical/Operations
Topic: RAT Deployment and ETOPS
Replies: 28
Views: 2304

Re: RAT Deployment and ETOPS

On the A350 the RAT generates electric power only. No hydraulic power. If you lose both engine you lose all four hydraulic pumps powering both systems. Emergency hydraulic power is provided by self-contained actuators. So even if you lose all (main) hydraulics you still have working control surfaces.

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by Starlionblue
Thu Jul 11, 2019 6:27 am
Forum: Technical/Operations
Topic: RAT Deployment and ETOPS
Replies: 28
Views: 2304

Re: RAT Deployment and ETOPS

If an engine is shut down, you still have the other engine, and you can get redundant electrical power from the APU. So no need for the RAT at all

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by Starlionblue
Wed Jul 10, 2019 10:11 am
Forum: Technical/Operations
Topic: Captains admonishing FO's for using speed brake on descent
Replies: 49
Views: 5190

Re: Captains admonishing FO's for using speed brake on descent

Across various types: How do the effectiveness of speed brakes vary on different aircraft? (I'm guessing they're all next to useless < 220kn). Any more/less effective than others? I've read that the Avro146/RJ100 speedbrake is ridiculously effective. Split tail design. Not quite next to useless, bu...

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by Starlionblue
Wed Jul 10, 2019 12:20 am
Forum: Technical/Operations
Topic: A340 dumps fuel touching down while on runway..
Replies: 21
Views: 4283

Re: A340 dumps fuel touching down while on runway..

Could it becoming from an overflow tank ? I doubt it given the volume (looks pressurized to me) but I am no way familiar with the fuel dumping systems. Any overflow would come out from a hole in the middle bottom of the outer wing, below the vent surge tank, which is outboard of the outer tank. Wel...

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by Starlionblue
Mon Jul 08, 2019 11:28 pm
Forum: Technical/Operations
Topic: Captains admonishing FO's for using speed brake on descent
Replies: 49
Views: 5190

Re: Captains admonishing FO's for using speed brake on descent

rjsampson, with regard to your general subject matter, “Captains admonishing FO’s for using speed brake on descent,” keep in mind while the entire “livin’ the dream” series is quite humorous, it is not completely accurate and most situations have been substantially enhanced for entertainment purpos...

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by Starlionblue
Mon Jul 08, 2019 8:50 am
Forum: Technical/Operations
Topic: Why cover the tyres?
Replies: 3
Views: 1552

Re: Why cover the tyres?

It could be the brakes that are being protected. Or the gear assembly as a whole.

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by Starlionblue
Mon Jul 08, 2019 8:48 am
Forum: Technical/Operations
Topic: A340 dumps fuel touching down while on runway..
Replies: 21
Views: 4283

Re: A340 dumps fuel touching down while on runway..

Max Q wrote:
I’m surprised there’s not a weight on wheels lock out for the dump nozzles


It's still double redundant. Both the computerised shutoff at a given level, and the pushbutton in the overhead. If neither of those closes the jettison valve, weight on wheels probably won't either.

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by Starlionblue
Sun Jul 07, 2019 11:28 pm
Forum: Technical/Operations
Topic: Captains admonishing FO's for using speed brake on descent
Replies: 49
Views: 5190

Re: Captains admonishing FO's for using speed brake on descent

The only example of poor descent planning that I see is planning an idle descent at .80/340kts from top of descent. We were CI99, oooops! I used them a lot more as a newer FO on the A320 series than I do now that I have more time in them. It was far more slippery than all the other planes I've ever...

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by Starlionblue
Sun Jul 07, 2019 1:40 pm
Forum: Technical/Operations
Topic: A340 dumps fuel touching down while on runway..
Replies: 21
Views: 4283

Re: A340 dumps fuel touching down while on runway..

Just to get the pic into the actual thread.

Image

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by Starlionblue
Sun Jul 07, 2019 3:58 am
Forum: Technical/Operations
Topic: Captains admonishing FO's for using speed brake on descent
Replies: 49
Views: 5190

Re: Captains admonishing FO's for using speed brake on descent

I noticed on the pprune forums that pilots were especially annoyed in these situations in the 757, describing the wing as the "cleanest" airplane you'll fly. Didn't check the time stamp on it... I'm sure there are "cleaner" airplanes nowadays... Forgive my ignorance: How do &quo...

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by Starlionblue
Sat Jul 06, 2019 6:19 am
Forum: Technical/Operations
Topic: Captains admonishing FO's for using speed brake on descent
Replies: 49
Views: 5190

Re: Captains admonishing FO's for using speed brake on descent

Yeah, and there are also these approaches where descend rate is high. Throw in some shortcuts or speed reductions, have a "good glider" like 787 or 350, and I can't see anyone planning a proper descend. I remember coming into Narita, on SWAMP N app to 16L. Limit at SWAMP (33 miles DME fro...

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by Starlionblue
Sat Jul 06, 2019 1:20 am
Forum: Technical/Operations
Topic: Captains admonishing FO's for using speed brake on descent
Replies: 49
Views: 5190

Re: Captains admonishing FO's for using speed brake on descent

As Woodreau says, due to ATC the speedbrake is often necessary. Also, winds aren't always as predicted. If there's a 30 knot tailwind at 8000 feet, the old speedbrake can come in handy. Besides, nobody is perfect. Sometimes things just don't go to plan, and lessons are learned. It might happen less ...

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by Starlionblue
Fri Jul 05, 2019 10:10 pm
Forum: Technical/Operations
Topic: A340 dumps fuel touching down while on runway..
Replies: 21
Views: 4283

Re: A340 dumps fuel touching down while on runway..

Probably a failure in the valves or electronics that drive them. Either that or crew forgot to close it after completing the dump. AFAIK on the A340, the system would stop jettisoning automatically when the preset fuel quantity was reached, or when reaching the hardcoded minimum figure. But the cre...

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by Starlionblue
Fri Jul 05, 2019 11:29 am
Forum: Technical/Operations
Topic: A340 dumps fuel touching down while on runway..
Replies: 21
Views: 4283

Re: A340 dumps fuel touching down while on runway..

paullam wrote:
Maybe some “eye witness” just saw vortexes?

Image


The pic in the article does seem rather like fuel is coming out of the jettison nozzle.

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by Starlionblue
Fri Jul 05, 2019 4:34 am
Forum: Technical/Operations
Topic: Do pilots always understand ATC?
Replies: 39
Views: 6493

Re: Do pilots always understand ATC?

No, the pilot is wrong. ATC isn’t there to serve him; we are there to serve everyone equally. I am sworn to provide safe and efficient service to everyone, whether you are in an A380 or a C182. I understand you have been flying long enough that you feel entitled cause you are flying a heavy, but do...

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by Starlionblue
Tue Jul 02, 2019 7:11 am
Forum: Technical/Operations
Topic: Jet buzzsaw noise
Replies: 17
Views: 1764

Re: Jet buzzsaw noise

The buzzsaw comes from the tips of the fan blades going supersonic. A large number of tiny sonic booms.

As you say it goes away because thrust is reduced and the blades slow down. Also with thinner air sound carries less well, I suppose.

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by Starlionblue
Sun Jun 30, 2019 9:20 am
Forum: Technical/Operations
Topic: Do pilots always understand ATC?
Replies: 39
Views: 6493

Re: Do pilots always understand ATC?

I'll throw in fatigue as a factor. If you're really tired, it is easy to miss or misunderstand calls. Some controllers pile the instructions on and you lose track. I can remember "descend to 4000, cleared for the ILS zulu runway 27 approach, QNH 1007" but please pause and let me read back...

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by Starlionblue
Sun Jun 30, 2019 8:47 am
Forum: Technical/Operations
Topic: WiFi on DHL A330?
Replies: 3
Views: 1305

Re: WiFi on DHL A330?

It does not have the typical large radome associated with inflight WiFi installations.

Besides, what would be the purpose? It is a cargo aircraft. Offering inflight WiFi to your flight crew is typically not a priority.

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by Starlionblue
Sun Jun 30, 2019 8:21 am
Forum: Technical/Operations
Topic: Do pilots always understand ATC?
Replies: 39
Views: 6493

Re: Do pilots always understand ATC?

I'll throw in fatigue as a factor. If you're really tired, it is easy to miss or misunderstand calls. Some controllers pile the instructions on and you lose track. I can remember "descend to 4000, cleared for the ILS zulu runway 27 approach, QNH 1007", but please pause and let me read back...

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by Starlionblue
Sun Jun 30, 2019 2:09 am
Forum: Technical/Operations
Topic: Fuel efficiency vs Noise reduction
Replies: 9
Views: 1616

Re: Fuel efficiency vs Noise reduction

At a guess, given how turbofans work, more fuel efficiency tends to give lower noise levels. Bigger fans are more efficient. They increase the bypass ratio so you get more low speed "quiet" air in proportion to high speed "noisy" air. In effect, bypass air acts as a noise blanket...

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by Starlionblue
Sun Jun 30, 2019 12:33 am
Forum: Technical/Operations
Topic: Silly question
Replies: 9
Views: 1842

Re: Silly question

Thankyou for the responses, I feel slightly more satisfied now... So perhaps 450ish MPH? If indeed we did add some downward elevator deflection, is it possible the tail would rise up off the ground at high enough speed? Pushing the nosewheel into the ground? It is possible the tail would rise, but ...

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by Starlionblue
Fri Jun 28, 2019 7:23 am
Forum: Technical/Operations
Topic: Silly question
Replies: 9
Views: 1842

Re: Silly question

For this exercise, it might be useful to think of the aircraft simply flying very low, e.g. 100 feet AGL.

High subsonic would be my guess. That's where drag starts increasing more rapidly.

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by Starlionblue
Wed Jun 26, 2019 11:54 am
Forum: Technical/Operations
Topic: Is there a airway from Chinese Tibet airspace into New Delhi Indian airspace!?
Replies: 9
Views: 2620

Re: Is there a airway from Chinese Tibet airspace into New Delhi Indian airspace!?

The equipment for flying routes over places like Northwestern China isn't that specialised btw. You just need to provide O2 to the pax for 45 minutes (IIRC) instead of the normal 15-20. So most, if not all, A350 or 777 I suppose could do it. Normally the main actual equipment difference is bottled ...

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by Starlionblue
Tue Jun 25, 2019 12:53 pm
Forum: Technical/Operations
Topic: GE9X Record Breaker
Replies: 59
Views: 7646

Re: GE9X Record Breaker

Its very likely. Ted Ingling (GE Aviation’s GE9X program manager ) said the GE9x has unofficially beaten the GE-115B record thrust in cold weather triple red line conditions and stated a new record for the books will be forthcoming. That means at least 121% of rated thrust.. very impressive. But al...

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by Starlionblue
Tue Jun 25, 2019 8:11 am
Forum: Technical/Operations
Topic: Is there a airway from Chinese Tibet airspace into New Delhi Indian airspace!?
Replies: 9
Views: 2620

Re: Is there a airway from Chinese Tibet airspace into New Delhi Indian airspace!?

B215 indeed. But it doesn't really go over the higher bits of the Himalayas. I don't know if you can actually fly over said bits of the Himalayas in a heavier widebody. An engine out or depress might leave you with nowhere to go. The equipment for flying routes over places like Northwestern China is...

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