Search found 240 matches

by benbeny
Sun Jan 29, 2017 12:56 pm
Forum: Technical/Operations
Topic: 737 max and A320neo performance numbers
Replies: 9
Views: 6743

Re: 737 max and A320neo performance numbers

I am curious too, and I will get the numbers right out of the computer when a certain airline gets theirs delivered. Though I am critical of one airframer just following and then blatantly copying Boeing in many regards, the 737 has become an embarrassment. Always too narrow, always too low, always...

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by benbeny
Sun Jan 29, 2017 12:37 pm
Forum: Technical/Operations
Topic: 767 Cabin Door Design
Replies: 9
Views: 3047

Re: 767 Cabin Door Design

XAM2175 wrote:
My understanding though is that this style of door, regardless of the exact method of emergency opening, has a greater risk of being rendered unopenable by fuselage deformation than both older and newer types..

I don't get it. Would you please explain it?

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by benbeny
Sun Jan 29, 2017 12:32 pm
Forum: Civil Aviation
Topic: "Green" airports
Replies: 26
Views: 2805

Re: "Green" airports

Just a quick thought, with the recent denial of global warming from a major country in the west side of the pond, how will that impact the development of 'green' airport? I thought the incentive is there, cause the energy itself isn't free, and lower energy consumption = lower cost = lower landing a...

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by benbeny
Sun Jan 29, 2017 12:26 pm
Forum: Civil Aviation
Topic: New Members Posting For First Time
Replies: 118
Views: 76092

Re: New Members Posting For First Time

I am one member who always wanted to join a.net but only recently I could, after a.net made it free for us to join. And please, I'm not a native speaker myself, and learning a new language isn't that easy. I think everyone should try to learn a new language just to appreciate how difficult it is (no...

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by benbeny
Sun Jan 29, 2017 12:16 pm
Forum: Civil Aviation
Topic: 1st 757 and 767
Replies: 44
Views: 6800

Re: 1st 757 and 767

I'm curious, why didn't Boeing offer 753 from the beginning to airlines and skip 762 entirely and going straight through 763 and 764?

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by benbeny
Fri Jan 27, 2017 2:23 pm
Forum: Civil Aviation
Topic: Norwegian to become 1st 737 MAX operator?
Replies: 42
Views: 11286

Re: Norwegian to become 1st 737 MAX operator?

CEO: Current Engine Option
Well, I think it is related to steam gauges and LCD are very different, not to mention vastly different speed, handling and quirks for specific types and procedures...

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by benbeny
Wed Jan 18, 2017 4:09 pm
Forum: Technical/Operations
Topic: 737 Composite wing possibility?
Replies: 8
Views: 1653

Re: 737 Composite wing possibility?

Sure, foldable wingtips is good option if your gate space isn't limited. But, it increases wing stress and weight from hydraulic actuators and associated plumbings. Folding wingtips also increases wing bending. You need stronger structures >>> weight increases. Besides, you need longer range to reco...

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by benbeny
Wed Jan 18, 2017 3:30 pm
Forum: Technical/Operations
Topic: Unshaven Cockpit Crew
Replies: 39
Views: 7690

Re: Unshaven Cockpit Crew

Are the oxygen tanks in the cockpit 100% oxygen? Air at sea level is only ~21% oxygen. Cockpit oxygen systems are bottled oxygen, 100%. Passenger oxygen is either chemically generated or bottled but still 100% oxygen. We breathe air (as in the mix of gases in the atmosphere) in normal operations bu...

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by benbeny
Sun Jan 15, 2017 4:25 pm
Forum: Technical/Operations
Topic: Questionable Turkish Airlines "Deicing" video
Replies: 21
Views: 3977

Re: Questionable Turkish Airlines "Deicing" video

Could be a mixture of water and isopropyl alcohol, which is sometimes used for deicing in general aviation. In any event it looks ghetto, and the whole process looked pointless because they really didn't cover much. It looks like no harm no foul, except that this is Turkish airlines, a supposedly w...

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by benbeny
Sun Jan 15, 2017 4:17 pm
Forum: Technical/Operations
Topic: Some questions about the 777X
Replies: 9
Views: 2469

Re: Some questions about the 777X

AA737-823 wrote:
The A321 with a CFM56 will sometimes feature them, albeit on the core exhaust nozzle, rather than the bypass.
Apparently the noise reduction is a meaningful amount, but so is the increase in fuel consumption.

I don't get it. How can it increase fuel consumption?

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by benbeny
Sat Jan 14, 2017 1:37 pm
Forum: Technical/Operations
Topic: Fuel savings when flying with "optimal trim"
Replies: 15
Views: 2544

Re: Fuel savings when flying with "optimal trim"

My bad, it's hard enough when you're not an English native speaker :(

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by benbeny
Fri Jan 13, 2017 7:57 pm
Forum: Technical/Operations
Topic: Fuel savings when flying with "optimal trim"
Replies: 15
Views: 2544

Re: Fuel savings when flying with "optimal trim"

Well, I believe someone more competent will come, but this is my $0.02. With optimal aft CG, that means less downforce required from horizontal stabilizer, meaning less AOA from horizontal stabilizer. Less AOA means less lift (negative lift in this context, but lift nonetheless). Cause lift creates ...

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by benbeny
Fri Jan 13, 2017 4:14 pm
Forum: Technical/Operations
Topic: AOA Question.
Replies: 17
Views: 3033

Re: AOA Question.

The wing stalls at the same AOA. Since most aircraft you can't see the AOA value directly we have to use airspeed to determine what the stall speed is. The problem is that airspeed only works at 1g. As soon as you change g loading the airspeed at which the aircraft stalls changes. But the AOA remai...

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by benbeny
Fri Jan 13, 2017 3:35 pm
Forum: Technical/Operations
Topic: AOA Question.
Replies: 17
Views: 3033

Re: AOA Question.

Sorry to drag this a bit, but I have a question. When you're doing more than 1G maneuver, wing loading increases, thus increasing the risk of stall.
Does the wing stall at still same AoA, or at lower AoA when the wing is loaded more than 1G?

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by benbeny
Fri Jan 13, 2017 3:13 pm
Forum: Civil Aviation
Topic: Iran Air ATR 72-600 emerges from paint
Replies: 29
Views: 14444

Re: Iran Air ATR 72-600 emerges from paint

Maybe they have unannounced deals to avoid upset some parties who are against Iran?

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by benbeny
Thu Jan 12, 2017 12:06 pm
Forum: Civil Aviation
Topic: Airbus A330neo production and delivery thread - 2016-2017
Replies: 759
Views: 241590

Re: A330 NEO Production And Delivery Thread Part 1

245 tons? That's nice. After 242 tons now, A330neo will have 245 tons option. I bet it will steal some orders from 789, especially for airlines who currently owns A330. A side question: can we retrofit A330ceo with neo engines and systems to make A330ceo >> A330neo, especially the 242 tons version w...

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by benbeny
Sun Jan 08, 2017 3:06 pm
Forum: Technical/Operations
Topic: Air contamination on flights
Replies: 31
Views: 3471

Re: Air contamination on flights

The only thing I can think of that would produce toxic fumes would be something in the bleed system itself, like oil contamination in the ducts. Personally, I've never experienced such a thing in hundreds of flights as a passenger and pilot. Having said that, coming into some airports you'll someti...

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by benbeny
Sun Jan 08, 2017 3:02 pm
Forum: Civil Aviation
Topic: 787 Seat width @9ab: significant drawback vs. A350?
Replies: 101
Views: 16131

Re: 787 Seat width @9ab: significant drawback vs. A350?

Well, I think the best solution is to conduct worldwide survey about standard body measurement. That way, we can cram as much people as possible without sacrificing comforts.

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by benbeny
Sat Jan 07, 2017 10:41 am
Forum: Technical/Operations
Topic: Air contamination on flights
Replies: 31
Views: 3471

Re: Air contamination on flights

Lol. The air quality in this country is not that good, that actually after few hours of flying the air on the ground stinks. Being said, in here the air in the plane is better than at the ground. Oh yes, people are pig. I've found not only once or twice, but many times people chewing gum and put the...

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by benbeny
Thu Jan 05, 2017 9:37 am
Forum: Technical/Operations
Topic: Why did Tricycle landing gears replaced the tail draggers
Replies: 46
Views: 6822

Re: Why did Tricycle landing gears replaced the tail draggers

bhill wrote:
Could the size of the propellers have been a factor as well?

I don't think that really matters. DC-3 and the plane of the same era is taildragger, but the biggest prop, Tu-95 'Bear' is tricycle...

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by benbeny
Wed Jan 04, 2017 11:23 am
Forum: Civil Aviation
Topic: 787 Seat width @9ab: significant drawback vs. A350?
Replies: 101
Views: 16131

Re: 787 Seat width @9ab: significant drawback vs. A350?

I've flown both on 17" and 18", and frankly I cannot tell the difference at all. I still have a lot of wiggle room, even on 17" seat. Mind you though, I'm an Asian and here we're slimmer. The main problem is, people are getting bigger and bigger. 17" seat was there for quite a lo...

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by benbeny
Wed Jan 04, 2017 8:32 am
Forum: Technical/Operations
Topic: Propliners boarding from rear. Why?
Replies: 19
Views: 2286

Re: Propliners boarding from rear. Why?

So the consensus here seems because it was leftover tradition from taildragger days, it's safer because it puts people away from spinning props, and because sometimes it's the only practical design.
Thank you very much for your valuable discussion, sometimes I feel like I ask dumb questions :)

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by benbeny
Wed Jan 04, 2017 8:24 am
Forum: Civil Aviation
Topic: Time for a A300NEO?
Replies: 118
Views: 21134

Re: Time for a A300NEO?

There definitely would be demand for a modern A300/310-200 specifically designed for short to medium routes, but I doubt there would be enough demand to make the project financially attractive to Airbus All the subsequent widebodies have big heavy wings, and are designed for much longer routes. Why...

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by benbeny
Tue Jan 03, 2017 8:03 pm
Forum: Civil Aviation
Topic: Time for a A300NEO?
Replies: 118
Views: 21134

Re: Time for a A300NEO?

I was reading that it is about the stage length they are doing. I think turnaround time is usually meant for the time needed by the airplane staying on the ground offloading and loading passengers and cargo... The doors are seldom the limiting factor. The limiting factor are passengers blocking the...

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by benbeny
Tue Jan 03, 2017 6:00 pm
Forum: Aviation Hobby
Topic: Aviation On Instagram?
Replies: 32
Views: 11371

Re: Aviation On Instagram?

@airside_ops_lax offers you unique perspective
@deakim74 and @albertsetjadiningrat is very good
@nat_rusdianto is a friend of mine, many daily life but good pictures

Oh, and mine is @benedictus_ contains many daily lives but sometimes planes too

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by benbeny
Tue Jan 03, 2017 2:57 pm
Forum: Technical/Operations
Topic: How does 744 tanker handle sudden drop in weight?
Replies: 21
Views: 4410

Re: How does 744 tanker handle sudden drop in weight?

What about torque forces from the wing changing as the lift changes? Wonder if they had to do any unusual CG tests or it was all theoretical and a pretty known quantity in the 744. Fred I don't think they need to do that. The tank itself, being heavy, must be located as close as possible to the emp...

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by benbeny
Tue Jan 03, 2017 2:41 pm
Forum: Technical/Operations
Topic: Propliners boarding from rear. Why?
Replies: 19
Views: 2286

Re: Propliners boarding from rear. Why?

Oh, and maybe because props doesn't have shrouds around them to clearly mark the limit of the prop? :D One scenario I can imagine about running the engine whole time is only when you're on military charters or quick turn-around with left-hand side engines shut. Otherwise, the ground crew will see to...

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by benbeny
Tue Jan 03, 2017 2:36 pm
Forum: Civil Aviation
Topic: Time for a A300NEO?
Replies: 118
Views: 21134

Re: Time for a A300NEO?

Getting 240 people off of a single aisle plane takes time. 753 has widebody turn time. New tech won't fix that. If it is a wide body instead of narrow body, it would still have "widebody turn time"? Widebody has larger doors, I think that means less time to pass through for the same numbe...

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by benbeny
Tue Jan 03, 2017 11:12 am
Forum: Technical/Operations
Topic: Propliners boarding from rear. Why?
Replies: 19
Views: 2286

Re: Propliners boarding from rear. Why?

I suspect a lot of it had to do with how the early propliners were laid out. The DC-4, for example, had its engines mounted up close to the flight deck, so there was little room for loading if the door was there next to the engine. That's why they moved it aft. As to why they boarded on the left, t...

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by benbeny
Mon Jan 02, 2017 5:01 pm
Forum: Technical/Operations
Topic: How does 744 tanker handle sudden drop in weight?
Replies: 21
Views: 4410

Re: How does 744 tanker handle sudden drop in weight?

I think the handling won't change too differently (maybe there are slight differences from CG, but still in the normal envelope) but the airplane will jump quite a bit (lost of weight means excess lift)

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by benbeny
Mon Jan 02, 2017 4:30 pm
Forum: Civil Aviation
Topic: Time for a A300NEO?
Replies: 118
Views: 21134

Re: Time for a A300NEO?

I´d go for option 3. Maybe there is no market for such plane. The "waiting for Boeing" argument makes no sense, if there is a market segment big enough to make it worthwhile to explore with the MoM in competition, it surely should be worth taking without the MoM launched. Strangely enough...

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by benbeny
Mon Jan 02, 2017 5:11 am
Forum: Civil Aviation
Topic: Time for a A300NEO?
Replies: 118
Views: 21134

Re: Time for a A300NEO?

Per seatguru:
UX 24C 275Y
TS 12C 333Y
AB 19C 44Y+ 227Y
AD 20C 100Y+ 151Y
EW 21Y+ 289Y
HA 18C 40Y+ 236Y
IB18C 269Y
QF 36C 268Y | 36C 265Y | 34C 265Y
UL 12C 24Y+ 251Y
MT 49Y+ 273Y | 321Y

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by benbeny
Mon Jan 02, 2017 4:40 am
Forum: Civil Aviation
Topic: Time for a A300NEO?
Replies: 118
Views: 21134

Re: Time for a A300NEO?

??? Around Asia many airlines are using A330 and etc. in these short, high demand route even when there are no lower mtow version, what's the problem? Maybe because it's highly used in the region so the support is widely available, the resale value is good, and it can be used for longer routes in a...

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by benbeny
Mon Jan 02, 2017 4:21 am
Forum: Technical/Operations
Topic: Propliners boarding from rear. Why?
Replies: 19
Views: 2286

Propliners boarding from rear. Why?

Apologies if this has been asked before :smile: The title pretty much sums it up. Why back in the days of propliners you board the aircraft from the rear door? Obviously for taildragger it's easier because it's the lowest part of the aircraft, but when they switch to DC-4, why did the arrangement pe...

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by benbeny
Mon Jan 02, 2017 3:59 am
Forum: Civil Aviation
Topic: Time for a A300NEO?
Replies: 118
Views: 21134

Re: Time for a A300NEO?

There was an A300NEO. It was called the A330. Yes. However I think Airbus is offering only the A330-300 as a regional variant? Is it available for the A330-200 variant? Yes, I wanna say the same thing too, A300neo is A330. A330-300 is higher capacity variant, less airframe weight per pax compared t...

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by benbeny
Sun Jan 01, 2017 7:29 am
Forum: Technical/Operations
Topic: About APU start up / Shut down
Replies: 65
Views: 12243

Re: About APU start up / Shut down

To give check captains a lot of questions they can shoot at you during a line check. :D In the cruise, fuel is transferred aft, which moves the CG aft. This decreases fuel consumption by a percent or two. As fuel is burned off, small forward transfers are made to keep the CG within target limits. I...

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by benbeny
Sun Jan 01, 2017 5:14 am
Forum: Technical/Operations
Topic: About APU start up / Shut down
Replies: 65
Views: 12243

Re: About APU start up / Shut down

The APU is fed from the trim tank if there is fuel in it by using the aft APU fuel pump, and from the wing tanks otherwise using the forward APU fuel pump. If the standpipe should be empty for some reason (well, not so much empty filled with air) you can't start the APU as the fuel won't be sucked ...

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by benbeny
Sun Jan 01, 2017 3:30 am
Forum: Technical/Operations
Topic: Why did Tricycle landing gears replaced the tail draggers
Replies: 46
Views: 6822

Re: Why did Tricycle landing gears replaced the tail draggers

I'm surprised no one mentioned visibility factors yet... I think it's far easier to taxi when you can see what's in front of you. Imagine 747 with taildraggers, the cockpit will be sitting very high in the air, you can't taxi properly. Also, I believe because we're used to have almost neutral pitch ...

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by benbeny
Sun Jan 01, 2017 2:59 am
Forum: Technical/Operations
Topic: How were DC-9's delivered to Hawaii pre-ETOPS?
Replies: 24
Views: 6012

Re: How were DC-9's delivered to Hawaii pre-ETOPS?

viewtopic.php?t=743305
Well this thread shows MD-80s has in the past special exemption if needed.
I came across this document which says MD-80 are ETOPS certified, though I can't verify this http://aviationenglish.club/wp-content/ ... -ETOPS.pdf
-->

viewtopic.php?t=743305
Well this thread shows MD-80s has in the past special exemption if needed.
I came across this document which says MD-80 are ETOPS certified, though I can't verify this http://aviationenglish.club/wp-content/ ... -ETOPS.pdf

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by benbeny
Sat Dec 31, 2016 4:42 am
Forum: Travel, Polls & Preferences
Topic: Flight number 1:
Replies: 39
Views: 4342

Re: Flight number 1:

BAW1 is the LCY-SNN-JFK A318. I get the aspect of an All-J flight being unique, but I personally would love for it to be an LHR-JFK nonstop. I think the main purpose of LCY-JFK is to cater businesspeople with service directly to the center of the city, which is defeated by LHR/STN-JFK... Of course ...

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by benbeny
Sat Dec 31, 2016 3:08 am
Forum: Travel, Polls & Preferences
Topic: Flight number 1:
Replies: 39
Views: 4342

Re: Flight number 1:

Garuda callsign is 'Indonesia', GIA 001 is reserved for presidential flight only.
AFR 001 is retired since Concorde is done. It used to be JFK-CDG.

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by benbeny
Sat Dec 31, 2016 2:26 am
Forum: Civil Aviation
Topic: Can an Obese or person over a certain weight range put an Emergency Slide at a certain risk?
Replies: 14
Views: 2792

Re: Can an Obese or person over a certain weight range put an Emergency Slide at a certain risk?

But by law all airliners are required to be able to evacuate under 90 seconds with half of the exit blocked. So why does a stuck obese person in a single overwing exit becomes a problem? It's no worse (maybe even better) than people retrieving their luggage from overhead bins during emergency.

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by benbeny
Fri Dec 30, 2016 6:46 am
Forum: Civil Aviation
Topic: A350 Regional.
Replies: 16
Views: 4864

Re: A350 Regional.

And 100% with single fuel stop. Seriously, why would anyone wants to order that when A330neo is almost ready for certification?

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by benbeny
Wed Dec 28, 2016 12:01 pm
Forum: Technical/Operations
Topic: How were DC-9's delivered to Hawaii pre-ETOPS?
Replies: 24
Views: 6012

Re: How were DC-9's delivered to Hawaii pre-ETOPS?

I'm wondering, what's the procedure for fuel fumes or spill inside the cabin? Sure it won't be a good thing.

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by benbeny
Wed Dec 28, 2016 11:57 am
Forum: Civil Aviation
Topic: Carrie Fisher suffers cardiac arrest on LHR-LAX
Replies: 69
Views: 20062

Re: Carrie Fisher suffers cardiac arrest on LHR-LAX

May the force be with her. RIP.

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by benbeny
Wed Dec 28, 2016 11:55 am
Forum: Travel, Polls & Preferences
Topic: Cabin pressurization effect on body
Replies: 24
Views: 7200

Re: Cabin pressurization effect on body

Something I remember from an EMT textbook is that blood pressure measurements taken on aircraft are very often wrong. I'm what way are they wrong? Do you mean it's always higher or lower than normal or is the blood pressure measurement at altitude not indicative of what the body is experiencing? Oi...

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by benbeny
Tue Dec 27, 2016 4:18 pm
Forum: Technical/Operations
Topic: How do you determine best glide?
Replies: 11
Views: 1617

Re: How do you determine best glide?

How do you determine sacrificing altitude vs cabin pressure in terms of total engine loss? You don't, at least not on the Bus. Reaching a suitable airport/landing site is of the highest priority. In absence of bleed pressure cabin altitude will rise slowly, but it should not be a rapid decompressio...

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by benbeny
Tue Dec 27, 2016 3:23 pm
Forum: Technical/Operations
Topic: How do you determine best glide?
Replies: 11
Views: 1617

Re: How do you determine best glide?

How do you determine sacrificing altitude vs cabin pressure in terms of total engine loss?

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by benbeny
Tue Dec 27, 2016 3:09 pm
Forum: Travel, Polls & Preferences
Topic: Cabin pressurization effect on body
Replies: 24
Views: 7200

Re: Cabin pressurization effect on body

Hope this helps. When you're flying, your body pressure is about the same as sea level (assuming you're living on a sea level). When you climb, the pressure outside decreases so there are differential pressure between your internal cavities and external air. Because the internal cavities is pressuri...

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by benbeny
Tue Dec 27, 2016 1:25 pm
Forum: Civil Aviation
Topic: Airbus A330neo production and delivery thread - 2016-2017
Replies: 759
Views: 241590

Re: A330 NEO Production And Delivery Thread Part 1

No need to retrain pilots or FAs (maybe mechanics needs training though), no need to stock spareparts of brand new types (I believe many of A330ceo spare parts are compatible), maybe they can get it earlier than A359, and maybe Airbus has some deals they cannot refuse.

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