Search found 2462 matches

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by LH707330
Tue Aug 03, 2021 9:58 pm
Forum: Travel, Polls & Preferences
Topic: Longest commercial flight record
Replies: 23
Views: 2449

Re: Longest commercial flight record

Absolutely, the TWA L1649A westbound polar routes were the longest ever flights by duration in the US context. See the schedule below. TW771 operates Monday, London-San Francisco, depart 11:55pm from London, arrive 1:05pm San Francisco. TW871 departs 11pm from Paris, arrives 12:10pm San Francisco. ...

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by LH707330
Tue Aug 03, 2021 9:38 pm
Forum: Civil Aviation
Topic: Time to bring back (some) regulation
Replies: 101
Views: 6508

Re: Time to bring back (some) regulation

Many of the proposed ideas here will have unintended consequences. If the problem OP is trying to fix is "the airline didn't hold up their end of the bargain because they dropped the ball on crew scheduling/vendor mgmt/etc.," then the only reform needed is a penalty/refund system that make...

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by LH707330
Tue Aug 03, 2021 8:14 pm
Forum: Technical/Operations
Topic: Thrust limits for derated jet engine?
Replies: 4
Views: 375

Re: Thrust limits for derated jet engine?

Short answer is " it depends," on a couple of variables: 1. If it's mechanically constrained (maybe the DC-10-15 engine was, I don't know), then it wouldn't be adjustable and in a pinch you'd get pinched. I'm not sure why that D10 model was limited to 45k #, so I couldn't tell you the spec...

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by LH707330
Tue Aug 03, 2021 5:26 am
Forum: Travel, Polls & Preferences
Topic: Longest commercial flight record
Replies: 23
Views: 2449

Re: Longest commercial flight record

I know some of TWA's Jetstreams were scheduled San Francisco to Paris or London in the late 1950's before the 707s came online, what was the flight time like on those? Of course this wouldnt be longest by distance but by time spent in the air. Absolutely, the TWA L1649A westbound polar routes were ...

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by LH707330
Tue Aug 03, 2021 5:21 am
Forum: Civil Aviation
Topic: Exterior design Airbus NEO vs Classic?
Replies: 9
Views: 3149

Re: Exterior design Airbus NEO vs Classic?

The A330neo also features a reshaped slat 1 and flap-track fairings: https://d1a2ot8agkqe8w.cloudfront.net/web/2019/05/a330neo-key-features-flight-test-article_77299.jpg Source: https://www.flightglobal.com/the-flight-test-of-airbuss-refreshed-widebody-the-a330neo/132343.article I think the flap tr...

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by LH707330
Mon Aug 02, 2021 5:10 pm
Forum: Technical/Operations
Topic: Maximum gross weight step climb question
Replies: 18
Views: 1251

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. Both of those designs have a lower wing loading than the 777-300ER, so they tend to have higher initial cruise altitudes, unless it makes sense to start lower for some reason (stronger tailwinds, ATC, turbule...

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by LH707330
Mon Aug 02, 2021 5:06 pm
Forum: Technical/Operations
Topic: MD-11: Two types of outboard flap tracks fairings
Replies: 9
Views: 828

Re: MD-11: Two types of outboard flap tracks fairings

https://airlinercafe.com/page.php?id=392
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Those new flap fairing were part of the PIP, as were the new #2 intake, windscreen wipers, GE pointy exhaust cones, and a handful of other things. More on the changes here: https://airlinercafe.com/page.php?id=392

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by LH707330
Mon Aug 02, 2021 4:34 pm
Forum: Travel, Polls & Preferences
Topic: Longest commercial flight record
Replies: 23
Views: 2449

Re: Longest commercial flight record

"TWA followed not long after with the Lockheed L-1649 Starliner, flying nonstop between San Francisco and London. The flight time remains the undisputed record, often exceeding 23 hours, said Hill." https://www.usatoday.com/story/travel/flights/todayinthesky/2018/10/13/singapore-airlines-w...

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by LH707330
Thu Jul 22, 2021 4:19 pm
Forum: Technical/Operations
Topic: SOP flap/slat movement on the DC-10
Replies: 21
Views: 1376

Re: SOP flap/slat movement on the DC-10

Did McDac actually call the system "dial-a-flap" as well, or is that pilot slang? No, it was referred to in our flight manual as ‘Dial a flap’ that was the official term You ‘dialed’ in a pre-planned flap setting for take off. We rarely used it, the only airport I remember using it from w...

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by LH707330
Wed Jul 21, 2021 6:42 pm
Forum: Technical/Operations
Topic: MOGAS Availability in airports in EU and US
Replies: 11
Views: 893

Re: MOGAS Availability in airports in EU and US

It's been done before. I know, its Wikipedia, but: https://en.wikipedia.org/wiki/Water_injection_(engine) In jets, sure, but doing so in an aviation piston engine would be a whole different thing. From that Wiki, it appears that it was done in Military Pistons pre-WWII. It appears some testing was ...

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by LH707330
Wed Jul 21, 2021 6:34 pm
Forum: Technical/Operations
Topic: SOP flap/slat movement on the DC-10
Replies: 21
Views: 1376

Re: SOP flap/slat movement on the DC-10

Did McDac actually call the system "dial-a-flap" as well, or is that pilot slang?

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by LH707330
Tue Jul 20, 2021 7:01 pm
Forum: Technical/Operations
Topic: MOGAS Availability in airports in EU and US
Replies: 11
Views: 893

Re: MOGAS Availability in airports in EU and US

Mogas is pretty rare at US airports these days and people who use Mogas tend to truck it in with jerry cans or they have a truck with like a 100 gallon tank in the bed. Most folks who have Mogas capable airplanes just use avgas. In some places in the US, the price isn't much different. Well, margin...

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by LH707330
Fri Jul 16, 2021 10:36 pm
Forum: Civil Aviation
Topic: FT: EU plans tax on aviation fuel - to be announced on 14th of July
Replies: 59
Views: 5923

Re: EU Climate Policy Airline Impact And Solutions

Hydrogen, so long as its sourced from green energy, is a good storage medium and a "known" technology. And it's not standing still, with lightweight pressure vessels etc. being developed together with more advanced fuel stacks. But it'd require a wholesale replacement of aircraft unless t...

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by LH707330
Fri Jul 16, 2021 9:30 pm
Forum: Civil Aviation
Topic: Updated: Used Delta Aircraft Order A359/737-900ER
Replies: 679
Views: 158263

Re: Updated: Used Delta Aircraft Order A359/737-900ER

How oddball are the B8F engines, do they have physical differences from the rest, or is it a thrust plug? A lot of the components hung on the engine are different. DL sent these to GE Caledonian for overhaul for several years while having a CF6-80C2B6F overhaul shop in house. In other words, the en...

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by LH707330
Fri Jul 16, 2021 9:29 pm
Forum: Technical/Operations
Topic: Chart of Jetliners with and without wing vortex generators.
Replies: 7
Views: 902

Re: Chart of Jetliners with and without wing vortex generators.

Where does the 747-8 have vortex generators? They added nacelle strakes on the engines, but I thought the wing didn't get any.

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by LH707330
Thu Jul 15, 2021 6:51 pm
Forum: Civil Aviation
Topic: Updated: Used Delta Aircraft Order A359/737-900ER
Replies: 679
Views: 158263

Re: Updated: Used Delta Aircraft Order A359/737-900ER

With the exception of the 717, what other orphan types does DL have? Even the out-of-production 757 is not an orphan plane The 764 is a big orphan. Oddball engines (-B8F), oddball landing gear and oddball black boxes in the E/E bay. How oddball are the B8F engines, do they have physical differences...

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by LH707330
Wed Jul 07, 2021 12:21 am
Forum: Technical/Operations
Topic: New FAA Standard Weights: A Summer and Winter of Fuel Stops?
Replies: 36
Views: 3501

Re: New FAA Standard Weights: A Summer and Winter of Fuel Stops?

US 5481 wouldn't have happened if the airplane had been maintained properly. The crew couldn't trim the aircraft to handle the overweight, out of envelope condition. That goes to show just how robustly the 1900 was built and how Swiss cheesed they got. At this point, most airlines are operating the...

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by LH707330
Tue Jul 06, 2021 11:29 pm
Forum: Technical/Operations
Topic: New FAA Standard Weights: A Summer and Winter of Fuel Stops?
Replies: 36
Views: 3501

Re: New FAA Standard Weights: A Summer and Winter of Fuel Stops?

US 5481 wouldn't have happened if the airplane had been maintained properly. The crew couldn't trim the aircraft to handle the overweight, out of envelope condition. That goes to show just how robustly the 1900 was built and how Swiss cheesed they got. At this point, most airlines are operating the...

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by LH707330
Sun Jul 04, 2021 4:35 pm
Forum: Technical/Operations
Topic: New FAA Standard Weights: A Summer and Winter of Fuel Stops?
Replies: 36
Views: 3501

Re: New FAA Standard Weights: A Summer and Winter of Fuel Stops?

US 5481 wouldn't have happened if the airplane had been maintained properly. The crew couldn't trim the aircraft to handle the overweight, out of envelope condition. That goes to show just how robustly the 1900 was built and how Swiss cheesed they got. At this point, most airlines are operating the...

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by LH707330
Sat Jul 03, 2021 4:03 am
Forum: Technical/Operations
Topic: Why is the BAC limit for pilots higher than that of driving in the US states?
Replies: 12
Views: 2065

Re: Why is the BAC limit for pilots higher than that of driving in the US states?

https://www.law.cornell.edu/cfr/text/14/91.17
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There's also 91.17.a.2 which states "under the influence." So if you're >8 hours and <.04 but still feel like garbage, they count that.

https://www.law.cornell.edu/cfr/text/14/91.17

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by LH707330
Fri Jul 02, 2021 3:14 am
Forum: Technical/Operations
Topic: New FAA Standard Weights: A Summer and Winter of Fuel Stops?
Replies: 36
Views: 3501

Re: New FAA Standard Weights: A Summer and Winter of Fuel Stops?

So have the weights actually increased? Passengers have got fatter over the pandemic? Or is this purely the extra weight of the extra fuel that's required to be loaded based on the passenger weights, if so then can it really have that much impact tankering a bit of extra fuel? Even the 50seat plane...

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by LH707330
Wed Jun 30, 2021 4:02 am
Forum: Technical/Operations
Topic: Could a shorter person, say a person like 5 feet or something be a pilot?
Replies: 12
Views: 2107

Re: Could a shorter person, say a person like 5 feet or something be a pilot?

There are a couple of cadet programs you can look at in Europe where they specify height requirements, IINM Swiss has 1.60-1.98, which probably covers 95% of the population. At 14, you've likely got some growing left to do. One of my buddies was 5'2" at that age and is now 5'10", so I'll b...

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by LH707330
Sun Jun 27, 2021 9:00 pm
Forum: Technical/Operations
Topic: Engine noise question
Replies: 22
Views: 2962

Re: Engine noise question

Think of a vehicle with sirens going by. That would be the Doppler effect, when source or receiver or both are moving. It really has an effect on the frequency perceived by the receiver. But I cant think of such effect by a moving medium. Gruß, masi1157 You might be right, then there's got to be a ...

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by LH707330
Sun Jun 27, 2021 12:13 am
Forum: Technical/Operations
Topic: Engine noise question
Replies: 22
Views: 2962

Re: Engine noise question

On blustery days you get puffs and lulls in the breeze, and shear between layers. This can distort the spacing between sound waves, which then registers in your ear as a quiet, lower tone, followed by a louder, higher tone when the stacked-up noise gets to you as the puff eases. Looking at the spee...

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by LH707330
Fri Jun 25, 2021 10:39 pm
Forum: Technical/Operations
Topic: Engine noise question
Replies: 22
Views: 2962

Re: Engine noise question

...or during a puff when the noise waves stack up. Noise waves stack up? What does that mean? Gruß, masi1157 On blustery days you get puffs and lulls in the breeze, and shear between layers. This can distort the spacing between sound waves, which then registers in your ear as a quiet, lower tone, f...

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by LH707330
Thu Jun 24, 2021 3:28 am
Forum: Technical/Operations
Topic: Engine noise question
Replies: 22
Views: 2962

Re: Engine noise question

Check FR24 next time you hear it to figure out which one it was. Chances are it was a 220 (whale song) or 320 (a howling sound like blowing over an empty beer bottle). A couple other designs make their own weird noises at certain angles and configs, but these two are the most noticeable to me. I'm ...

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by LH707330
Wed Jun 23, 2021 9:14 pm
Forum: Technical/Operations
Topic: Engine noise question
Replies: 22
Views: 2962

Re: Engine noise question

Check FR24 next time you hear it to figure out which one it was. Chances are it was a 220 (whale song) or 320 (a howling sound like blowing over an empty beer bottle). A couple other designs make their own weird noises at certain angles and configs, but these two are the most noticeable to me.

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by LH707330
Mon Jun 21, 2021 8:17 pm
Forum: Technical/Operations
Topic: Synthetic aviation fuels - the future for environmentally friendly aviation?
Replies: 10
Views: 1651

Re: Synthetic aviation fuels - the future for environmentally friendly aviation?

I don't think you can change kerosene into more energetic kerosene, but then again I'm not a petrochemical expert. Cars can add nitrous, but then you'd upset the rather delicate balance of jet engine combustion. Heating or cooling the fuel will not change the energy density by weight. It will simpl...

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by LH707330
Sun Jun 20, 2021 2:42 am
Forum: Technical/Operations
Topic: Synthetic aviation fuels - the future for environmentally friendly aviation?
Replies: 10
Views: 1651

Re: Synthetic aviation fuels - the future for environmentally friendly aviation?

https://www.merlins-corner.net/whysaf.html

One thing we should all nudge the airlines to do is add that checkbox to boost the demand, then the scaling of SAF will clear the hump faster.
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I wrote a summary of this last year: https://www.merlins-corner.net/whysaf.html

One thing we should all nudge the airlines to do is add that checkbox to boost the demand, then the scaling of SAF will clear the hump faster.

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by LH707330
Thu Jun 10, 2021 5:24 am
Forum: Technical/Operations
Topic: DFW - You're number ???? for takeoff!
Replies: 42
Views: 6838

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

At LAX, when departing 24L, while taxiway E6 is the last taxiway onto the runway, ATC can assign departure from intersections E7 or E8. Similarly, when departing Runway 25R, aircraft are instructed not to proceed beyond Taxiway F until cleared to do so by the Tower. This gives the tower controller ...

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by LH707330
Thu Jun 10, 2021 5:06 am
Forum: Civil Aviation
Topic: Boeing offers 777X Freighter to QR. Eyeing Order for 30
Replies: 129
Views: 20864

Re: Boeing offers 777X Freighter to QR. Eyeing Order for 30

I agree with Revelation, the exact length is not that big of a deal. There's precedent in the 747-8, the freighter and pax versions were initially going to be different lengths for payload/range optimization for Emirates. In the end, LH wanted the payload more than the range, and was willing to coug...

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by LH707330
Sat Jun 05, 2021 12:06 am
Forum: Civil Aviation
Topic: Attempted Cockpit Breach on DL386
Replies: 51
Views: 15223

Re: Attempted Cockpit Breach on DL386

Insane. What is it about claustrophobia that makes people behave like monkeys? I had this happen on a flight a while back. First flight returned after an hour because something was broken, then they rebooked a bunch of us on the next one. One guy who had been in F and had a few went to the same bar...

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by LH707330
Sat Jun 05, 2021 12:03 am
Forum: Technical/Operations
Topic: Russian Aircraft and Very Tall Landing Gear
Replies: 43
Views: 6933

Re: Russian Aircraft and Very Tall Landing Gear

Thanks for that reference! I dug out my Norris and Wagner "A340 and A330" book, on page 68 there's a discussion of the gear: "Another change discussed at the meeting was a possible 1'4" extension to the nose gear leg to improve ground handling...Airbus planned to introduce the lo...

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by LH707330
Fri Jun 04, 2021 11:40 pm
Forum: Civil Aviation
Topic: Attempted Cockpit Breach on DL386
Replies: 51
Views: 15223

Re: Attempted Cockpit Breach on DL386

A single person attempting a cockpit breach is usually some drunk moron who thinks he wants to tell the pilot something. Not persuaded that this is anything more than an isolated nitwit. Like the guy years ago who took a dump on the food cart in first class after having too many free cocktails. Ins...

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by LH707330
Fri Jun 04, 2021 3:20 am
Forum: Technical/Operations
Topic: Russian Aircraft and Very Tall Landing Gear
Replies: 43
Views: 6933

Re: Russian Aircraft and Very Tall Landing Gear

AFAIK the wingbox isn't actually lower. The fairing is just much larger. If you look up an A330 wheel well you can see that the wing spar is way up in there. The reason the rear cargo door is higher on the A340 is that the fuselage is not horizontal when on the ground. The tail sits higher. Unfortu...

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by LH707330
Thu Jun 03, 2021 3:31 am
Forum: Technical/Operations
Topic: Retro-jet maintenance
Replies: 8
Views: 2492

Re: Retro-jet maintenance

A lot of the retrojets simply deviate from the historical design to make it easier to maintain, for exactly that reason. For example, Lufthansa's retro 747 has a pearl gray in place of the original natural metal, which is hardly noticeable unless you find it in the right lighting. At that point, the...

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by LH707330
Thu Jun 03, 2021 3:09 am
Forum: Technical/Operations
Topic: Russian Aircraft and Very Tall Landing Gear
Replies: 43
Views: 6933

Re: Russian Aircraft and Very Tall Landing Gear

Indeed. Case in point, Airbus' decision to go with almost disproportionately tall gear on the A300B1 paid off in spades, as it could be evolved/stretched all the way to the A340-600. That's a difference of almost 25 metres in length, from 50.97m to 75.36 m. The 330/340 had a completely different WB...

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by LH707330
Tue Jun 01, 2021 11:04 pm
Forum: Technical/Operations
Topic: Russian Aircraft and Very Tall Landing Gear
Replies: 43
Views: 6933

Re: Russian Aircraft and Very Tall Landing Gear

A huge negative: weight Weight is always a consideration But if you’re unable to stretch your design because the gear is too short you’ll have to add weight anyway in the modification process Indeed. Case in point, Airbus' decision to go with almost disproportionately tall gear on the A300B1 paid o...

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by LH707330
Thu Apr 29, 2021 12:55 am
Forum: Technical/Operations
Topic: boeing 747 400X, the 400 under a different name or something else?
Replies: 10
Views: 3084

Re: boeing 747 400X, the 400 under a different name or something else?

The 400X became the 400ER, which as the article mentions is barely externally different. The only physical change is the very slightly larger tires (51" vs 50" IIRC), which in 144 is negligible. Did'nt the -400ER have slightly taller winglets too? Not to my knowledge, no. It's possible th...

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by LH707330
Tue Apr 27, 2021 4:31 am
Forum: Technical/Operations
Topic: A321 vs B739 Fuel burn
Replies: 32
Views: 6160

Re: A321 vs B739 Fuel burn

The 321 is heavier and has slightly better aero, but has engines optimized for longer range, so its relative advantage from a fuel burn standpoint is at longer ranges. If you have the equivalent 737 and 32S, you're generally better off butting the A on the long stage length and the B on the short on...

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by LH707330
Tue Apr 27, 2021 4:25 am
Forum: Technical/Operations
Topic: boeing 747 400X, the 400 under a different name or something else?
Replies: 10
Views: 3084

Re: boeing 747 400X, the 400 under a different name or something else?

The 400X became the 400ER, which as the article mentions is barely externally different. The only physical change is the very slightly larger tires (51" vs 50" IIRC), which in 144 is negligible. The 610 seating is probably the all-economy layout. If you're planning to use a Revell 747-400 ...

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by LH707330
Mon Apr 05, 2021 3:46 am
Forum: Travel, Polls & Preferences
Topic: Why no Boeing 707 stretch?
Replies: 19
Views: 3946

Re: Why no Boeing 707 stretch?

The 707-300 series was a stretch over the original -100 series. There was also the shrink 720, so three different fuselage lengths. Boeing also studied further stretches - a -600 domestic version and a -800 intercontinental ranged version. I believe development was dropped in favour of the 747. The...

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by LH707330
Mon Apr 05, 2021 3:43 am
Forum: Civil Aviation
Topic: Reasons for DC-8 stopping production earlier than the 707?
Replies: 24
Views: 6289

Re: Reasons for DC-8 stopping production earlier than the 707?

It is interesting to note as well, as a side bar, that the DC-8 was incredibly stretchable, due to a relatively high landing gear system. I'm curious what went on with the 707-120 to 707-320. I see that the wing was lengthened due to a wing insert at the root of the wing. This shifted the engine lo...

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by LH707330
Mon Apr 05, 2021 3:35 am
Forum: Technical/Operations
Topic: Why did Boeing design the 707 to have a shorter landing gear than the DC-8?
Replies: 10
Views: 4109

Re: Why did Boeing design the 707 to have a shorter landing gear than the DC-8?

I think there were two main drivers: 1. The 707 shared much in common with the tanker and they wanted them to use existing GSE and be lighter, hence the lower gear. 2. Timing: in 1952 when they launched the 367-80, the engine thrust and traffic made a 5Y fuselage with 100-120 seats a big plane. The ...

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by LH707330
Tue Mar 30, 2021 1:25 am
Forum: Technical/Operations
Topic: Different manufacturers for jet engines #1 vs. #2
Replies: 25
Views: 4705

Re: Different manufacturers for jet engines #1 vs. #2

I think I recall from past discussions that engines from different vintages (e.g. line numbers 500 and 900) of the same make/model are allowed on a given airplane. Are airlines allowed to mix/match engines even further and do unusual combinations? Examples: [list] [*] PW4090 for engine #1; PW4098 f...

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by LH707330
Sun Mar 28, 2021 7:21 pm
Forum: Technical/Operations
Topic: When did English become the Considered Language of the Skies.
Replies: 10
Views: 2144

Re: When did English become the Considered Language of the Skies.

Just to point it out... nearly all radio traffic between ATC and aircraft is done in the local language of each country. Often they only talk English to foreign aircraft. Some countries try to maintain English as the preferred language on the main frequencies, but it's rare. If you fly through Sout...

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by LH707330
Sat Mar 27, 2021 9:08 pm
Forum: Civil Aviation
Topic: AY signs LOI for electric Heart ES-19
Replies: 23
Views: 3313

Re: AY signs LOI for electric Heart ES-19

Here is there website: https://heartaerospace.com/ They don’t seem to state the operating advantages necessarily of the aircraft. Scroll down a bit and you'll find this: "Cost-Effective 75% cost savings in fuel and 50% in maintenance Electrification changes the equation for regional air travel...

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by LH707330
Fri Mar 26, 2021 3:34 am
Forum: Technical/Operations
Topic: Daylight Savings Time - connections
Replies: 14
Views: 2525

Re: Daylight Savings Time - connections

I was having this discussion with friends recently, and had a related question for longhaul fleets: how do carriers that typically have a 24-hour average rotation manage with a 23-hour day? Do they go all-hands on deck and not schedule MX so that they can keep the schedule, remove schedule buffer 10...

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by LH707330
Fri Mar 26, 2021 3:21 am
Forum: Travel, Polls & Preferences
Topic: Why no Boeing 707 stretch?
Replies: 19
Views: 3946

Re: Why no Boeing 707 stretch?

There were seven total lengths of the 707 versions across four fuselage lengths. They are, in length order: 707-138 707-138B 720 720B 707-100/200 707-100B 707-300/300B/300C/400 Now for the long version (pun intended): Boeing originally planned the 707 with the same 144" wide (5Y) and 128' long ...

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by LH707330
Fri Mar 26, 2021 2:40 am
Forum: Technical/Operations
Topic: Modern Turbofan Engine Efficiency
Replies: 33
Views: 8280

Re: Modern Turbofan Engine Efficiency

The combined-cycle engines have two thermodynamic advantages: 1. As mentioned, the hot exhaust warms up water to power a steam turbine 2. Many CCGTs also use water in the compressor to reduce compressor temperatures, work required to compress the air mass, lower NOx, and allow higher fuel addition b...

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