Search found 20687 matches

by Starlionblue
Sat Apr 03, 2021 12:50 pm
Forum: Technical/Operations
Topic: Jetblue 106 to Ponce missed approach today?
Replies: 13
Views: 1680

Re: Jetblue 106 to Ponce missed approach today?

I meant that any aircraft having an MTOW near MLW would have an easier time burning enough fuel circling or whatever to get down to MLW. Unlike, say a wide body that experienced a mechanical problem at time at takeoff fully fuelled where getting back was time critical and you couldn't afford to spe...

Jump to post
by Starlionblue
Sat Apr 03, 2021 12:47 pm
Forum: Technical/Operations
Topic: When specifying aircraft range?
Replies: 15
Views: 2260

Re: When specifying aircraft range?

All those public numbers should be treated with a big scoop of salt. They're marketing figures, and will be massaged to be favourable for the manufacturer's product.

Operators need aircraft for specific missions and will negotiate specific performance guarantees.

Jump to post
by Starlionblue
Fri Apr 02, 2021 4:47 am
Forum: Technical/Operations
Topic: CRJ-700 “hole” in wing
Replies: 4
Views: 1755

Re: CRJ-700 “hole” in wing

The bottom of the wing is way less sensitive to flow disturbance compared to the top.

Jump to post
by Starlionblue
Wed Mar 31, 2021 11:04 am
Forum: Technical/Operations
Topic: A/C type behaviour in turbulence
Replies: 26
Views: 4223

Re: A/C type behaviour in turbulence

A330-600 was a nightmare in turbulence. It was just too long and all oscillations were exaggerated in the nose A340-600? IIRC, Airbus introduced some automatic pitch inputs to counter the effect, but that didn't completely "solve" the issue. The 787 and A350 have active damping as standar...

Jump to post
by Starlionblue
Wed Mar 31, 2021 6:44 am
Forum: Technical/Operations
Topic: How are flight crews positioned for non-daily overseas service?
Replies: 11
Views: 2318

Re: How are flight crews positioned for non-daily overseas service?

In that case in Athens, my guess is the crew would be treated to a mini-holiday, accommodation included. I've done a fair share of those. I love them. Long story short, it is the pilots job to get to and from the base. It is the airlines job to take care of you everywhere else. When I position from...

Jump to post
by Starlionblue
Wed Mar 31, 2021 4:56 am
Forum: Technical/Operations
Topic: A/C type behaviour in turbulence
Replies: 26
Views: 4223

Re: A/C type behaviour in turbulence

Flight attendants also have a keen perspective on turbulence, which is interesting to contrast with pilots. When flight attendants work, they are working in multiple places related to the center of gravity - forward of it, on it, and behind it. Therefore, they really get to feel how different parts...

Jump to post
by Starlionblue
Wed Mar 31, 2021 4:54 am
Forum: Technical/Operations
Topic: How are flight crews positioned for non-daily overseas service?
Replies: 11
Views: 2318

Re: How are flight crews positioned for non-daily overseas service?

Five day layover = five days of hotel and allowances. I've never heard of anyone flying home on a multi-day layover, but I suppose it is possible. :D In many cases, there are legal barriers as well. E.g. some countries won't let you travel more than a certain distance from the airport if you enter a...

Jump to post
by Starlionblue
Wed Mar 31, 2021 4:51 am
Forum: Technical/Operations
Topic: Crosswind Landing Question
Replies: 4
Views: 1436

Re: Crosswind Landing Question

Wing shape and size have a lot to do with it. For example, the A330 is not as stable in gusty winds as the 777 because of the higher aspect wing and lower wing loading. While larger aircraft have more inertia to compensate for larger surface area, it does make a difference in how much you need to an...

Jump to post
by Starlionblue
Wed Mar 31, 2021 4:45 am
Forum: Technical/Operations
Topic: Why do all new-build cargo aircraft have lower deck cargo areas?
Replies: 10
Views: 2733

Re: Why do all new-build cargo aircraft have lower deck cargo areas?

Why do all new build cargo aircraft have a lower deck cargo area? Shouldn´t cargo aircraft just have fuel tanks on the lower deck as most of the cargo is transported on the main deck? Wouldn´t the lower deck being just fuel tanks allow the aircraft to have TPAC/TATL range from the US west coast? An...

Jump to post
by Starlionblue
Wed Mar 31, 2021 3:40 am
Forum: Technical/Operations
Topic: Sourcing old electronics for new planes
Replies: 8
Views: 1601

Re: Sourcing old electronics for new planes

AFAIK, the manufacturers of those bits simply buy components in bulk at the time. The FM in the A330 probably uses a 486 processor or the like and Honeywell have a bunch in a warehouse.

Jump to post
by Starlionblue
Tue Mar 30, 2021 12:17 am
Forum: Technical/Operations
Topic: Airlines that don't require their crews to overnight
Replies: 21
Views: 2820

Re: Airlines that don't require their crews to overnight

As far as I know Ryanair and EasyJet don’t have scheduled overnights. Unfortunately, overnights have become relatively uncommon for short/medium haul flights with many airlines. Make that fortunately. I’d rather be home everyday than spend time away in hotels. No matter how good they are and how ‘g...

Jump to post
by Starlionblue
Mon Mar 29, 2021 1:45 pm
Forum: Technical/Operations
Topic: Factor safety used in E170 wing
Replies: 2
Views: 1110

Re: Factor safety used in E170 wing

As a general rule structures have a minimum 50% safety factor beyond the load limit. The design load limits for a transport category aircraft are +2.5G/-1G clean, +2G/0G dirty. - Beyond load limits, permanent deformation may occur. - Ultimate load is limit load x1.5. - Beyond ultimate load, the stru...

Jump to post
by Starlionblue
Sun Mar 28, 2021 1:20 am
Forum: Technical/Operations
Topic: When did English become the Considered Language of the Skies.
Replies: 10
Views: 2136

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...

Jump to post
by Starlionblue
Thu Mar 25, 2021 1:33 am
Forum: Technical/Operations
Topic: Grass landing strips
Replies: 21
Views: 2630

Re: Grass landing strips

LOL...what airline is that?? Famous Susi Air They even have an awesome TV Show. Oh nice! Thanks for the info!! Most of the episodes are on YouTube. There's a bit of dramatic voiceover syndrome but interesting stuff. I've met a few pilots who've worked in the area and it is indeed as depicted. Flyin...

Jump to post
by Starlionblue
Wed Mar 24, 2021 1:50 am
Forum: Technical/Operations
Topic: Grass landing strips
Replies: 21
Views: 2630

Re: Grass landing strips

AntonioMartin wrote:
I was just wondering if there are any grass air fields with commercial airline ops....


Indonesia would like a word. :D

Image

Jump to post
by Starlionblue
Mon Mar 22, 2021 2:42 pm
Forum: Technical/Operations
Topic: Grass landing strips
Replies: 21
Views: 2630

Re: Grass landing strips

I realize the early-days-of-aviation-romance of the grass landing strip and its quaint, throwback history but are they inherently more difficult to handle than pavement? Particularly, when dew covered or wet from a rain? I always imagined them as manicured as a golf fairway, but then I remembered h...

Jump to post
by Starlionblue
Mon Mar 22, 2021 3:46 am
Forum: Technical/Operations
Topic: Why not wider runways?
Replies: 31
Views: 5192

Re: Why not wider runways?

The problem with landing on the centerline all the time is that Mother Nature has a habit of making that challenging. I'm just suggesting making that challenge a little easier. Is the cost to expand the runways more expensive than the cost of losing an aircraft? There are spacing requirements for t...

Jump to post
by Starlionblue
Sun Mar 21, 2021 1:56 am
Forum: Technical/Operations
Topic: PIC Swap With Two Captains?
Replies: 10
Views: 1989

Re: PIC Swap With Two Captains?

Thanks for the responses guys! Follow up, on long-haul multiple-crew flights, what is the procedures for handling unexpected/emergency situations while the PIC/commander is in rest? If there is a situation that warrants the commander's attention, he/she is simply notified. However, the relief quali...

Jump to post
by Starlionblue
Sat Mar 20, 2021 3:28 am
Forum: Technical/Operations
Topic: PIC Swap With Two Captains?
Replies: 10
Views: 1989

Re: PIC Swap With Two Captains?

Well, there's a commander on the flight plan, so I guess that's your answer.

No idea how they determine it. ;)

Jump to post
by Starlionblue
Sat Mar 20, 2021 3:27 am
Forum: Technical/Operations
Topic: How are aircraft scheduled for major airlines?
Replies: 4
Views: 1420

Re: How are aircraft scheduled for major airlines?

Simplistic answer, but there's software. :D

You can normally book a flight a year in advance, so the schedule itself goes out that far in many cases. Specific tail assignment is not done that far out though.

Jump to post
by Starlionblue
Fri Mar 19, 2021 12:36 am
Forum: Technical/Operations
Topic: HUD on commercial aircraft.
Replies: 8
Views: 1654

Re: HUD on commercial aircraft.

I have always viewed HUDs as an American thing. Initially devised to use for low vis in aircraft without autoland IIRC (thinking DC-9/MD80 etc. here). Over in Europe, which really needs low vis ops, HUDs have not really caught on. My lot operates CATIIIB to 75m RVR Minima without HUD. That said, I ...

Jump to post
by Starlionblue
Thu Mar 18, 2021 2:33 pm
Forum: Technical/Operations
Topic: Parting out retired aircraft
Replies: 14
Views: 2138

Re: Parting out retired aircraft

Was just reading an interesting article from the UK on retired BA 747s that left me with a question. Are there parts from, say a 15-year-old 747 that might be useful in other, more modern airframes, similar to the way car parts often span a range of years, makes and models? Is would everything from...

Jump to post
by Starlionblue
Wed Mar 17, 2021 1:40 am
Forum: Technical/Operations
Topic: Sunwing 737 Runway 28 Landing at SXM on video
Replies: 52
Views: 7852

Re: Sunwing 737 Runway 28 Landing at SXM on video

Thank you very much for the clear reply. I have another related question: are visual approaches with downwind and half-turn safer than circling approaches? Briefly reading on Wikipedia, circle-to-land is used when "the other runways might lack instrument procedures or their approaches cannot b...

Jump to post
by Starlionblue
Wed Mar 17, 2021 1:32 am
Forum: Technical/Operations
Topic: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle
Replies: 33
Views: 3065

Re: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle

Lift is reduced in a climb only assuming a constant AoA at the same speed. Unless you're just doing a very small climb, you'd point the nose up to increase AoA. Since AoA is increased, lift increases in your typical climb. More lift means more drag, which is offset by thrust. The engine is part of ...

Jump to post
by Starlionblue
Tue Mar 16, 2021 1:25 pm
Forum: Technical/Operations
Topic: Can the A321XLR make it LHR-HLE direct?
Replies: 43
Views: 9648

Re: Can the A321XLR make it LHR-HLE direct?

Random thought- there are many cases of flights to remote destinations that lack diversion points other than the point of origin (hence round-trip fuel), but are there any examples where the nearest diversion point (in this case ASI) is also very remote? Flying to HLE where the weather there and at...

Jump to post
by Starlionblue
Tue Mar 16, 2021 4:06 am
Forum: Technical/Operations
Topic: Why are engines on planes changed so often?
Replies: 18
Views: 3812

Re: Why are engines on planes changed so often?

Engines (and aircraft, and APUs) are leased in order for the operator to have a reliable and even expenditure over time. If you own the engines outright and one breaks down in dramatic fashion, you have an unpredictable and large expense. If you lease the engine you keep paying the same amountand th...

Jump to post
by Starlionblue
Tue Mar 16, 2021 2:57 am
Forum: Technical/Operations
Topic: Can the A321XLR make it LHR-HLE direct?
Replies: 43
Views: 9648

Re: Can the A321XLR make it LHR-HLE direct?

Random thought- there are many cases of flights to remote destinations that lack diversion points other than the point of origin (hence round-trip fuel), but are there any examples where the nearest diversion point (in this case ASI) is also very remote? Flying to HLE where the weather there and at...

Jump to post
by Starlionblue
Mon Mar 15, 2021 6:57 am
Forum: Technical/Operations
Topic: Question re. B737 & TOGA
Replies: 13
Views: 1752

Re: Question re. B737 & TOGA

What I was thinking of is the reduced wear and tear on the engine would make it have better reliability in obtaining full thrust if it is required in an emergency event. Obviously one cannot use full thrust if a derated takeoff was planned for a number of reasons mainly aircraft control. Wording wa...

Jump to post
by Starlionblue
Mon Mar 15, 2021 6:56 am
Forum: Technical/Operations
Topic: Sunwing 737 Runway 28 Landing at SXM on video
Replies: 52
Views: 7852

Re: Sunwing 737 Runway 28 Landing at SXM on video

I'm sorry for layman's question, but is that a "circling approach" or something different? How common are those approaches for widebodies? I used to see 777s, 767s and 787s doing similar approaches often near my home in a 2,000m runway, and I always assumed most airports with terrain limi...

Jump to post
by Starlionblue
Mon Mar 15, 2021 2:44 am
Forum: Technical/Operations
Topic: Question re. B737 & TOGA
Replies: 13
Views: 1752

Re: Question re. B737 & TOGA

Both methods are ways of obtaining Reduced Thrust. They obviously have different limitations on when and how they may be used. They are there to reduce engine wear to provide longer life, ensure reserve engine thrust availability in the event of some emergencies and better economics. For details se...

Jump to post
by Starlionblue
Mon Mar 15, 2021 2:20 am
Forum: Travel, Polls & Preferences
Topic: Why no Boeing 707 stretch?
Replies: 19
Views: 3928

Re: Why no Boeing 707 stretch?

. the KC-135 (Boeing model 717*) The official designation of the KC-135 is Boeing 717-148. The twin-engine version of the Boeing 717 aircraft - original MD-95 design - are assigned a -200 designation, I.e. Boeing 717-200, and from a review of the data at rzjets.net, many have the Boeing customer co...

Jump to post
by Starlionblue
Mon Mar 15, 2021 1:51 am
Forum: Technical/Operations
Topic: Question re. B737 & TOGA
Replies: 13
Views: 1752

Re: Question re. B737 & TOGA

Starlionblue - thanks, but you are talking about an Airbus of course: I was really asking about Boeings (no FLEX option there!). I think I was aware of the various options, but wondered if using TOGA had become pretty much standard. I note that "On the 737NG I fly it's 100% always TOGA", ...

Jump to post
by Starlionblue
Sun Mar 14, 2021 2:45 pm
Forum: Technical/Operations
Topic: Question re. B737 & TOGA
Replies: 13
Views: 1752

Re: Question re. B737 & TOGA

The vast majority of takeoffs are at reduced thrust. FLEX/Assumed Temp or Fixed Derate. TOGA is used when that much thrust is needed. TOGA saves a bit of fuel, but the extra wear costs more than the saved fuel. If the conditions suggest TOGA is advisable, e.g. windshear reports, TOGA may be set or b...

Jump to post
by Starlionblue
Sun Mar 14, 2021 12:55 am
Forum: Technical/Operations
Topic: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle
Replies: 33
Views: 3065

Re: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle

Importantly, and as shown in Florianopolis' reply above, AoA is not directly related to pitch angle. There have been accidents where the aircraft has been pointed almost straight down, while still being stalled. Yes, but only momentarily. If the aircraft suddenly pointed it's nose downwards while t...

Jump to post
by Starlionblue
Sat Mar 13, 2021 1:42 pm
Forum: Technical/Operations
Topic: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle
Replies: 33
Views: 3065

Re: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle

On a 320 flaps 3 landing, at Vref airspeed, the nose is 5 degrees nose up, with the FPA indicating 3 degrees nose down. so my AoA during final approach in an A320 is 8 degrees of AoA and still descending to land on the runway. I could be wrong though. As far as I understand, pitch and AoA are relat...

Jump to post
by Starlionblue
Sat Mar 13, 2021 7:45 am
Forum: Technical/Operations
Topic: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle
Replies: 33
Views: 3065

Re: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle

carrier aircraft unlike commercial airliners and general aviation, during approach and landing don't fly airspeed - Vref or anything like that. instead they fly AoA using the indexer that is a prominent instrument just to the left of the HUD. they're just looking for a circle that says they're &quo...

Jump to post
by Starlionblue
Sat Mar 13, 2021 1:35 am
Forum: Technical/Operations
Topic: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle
Replies: 33
Views: 3065

Re: How do the carrier landing aircraft manage to descend during approach with such a big positive pitch angle

It is a controlled descent. Lift is still being generated and holding the plane weight- it’s just holding it in a descent profile. Just ends with no flare as you note. They basically crash it into the deck and go to full throttle as they do so in case the arrester cable breaks. Note the very strong...

Jump to post
by Starlionblue
Fri Mar 12, 2021 2:02 am
Forum: Technical/Operations
Topic: Holding the nose wheel off
Replies: 35
Views: 4158

Re: Holding the nose wheel off

Not sure about the big jets going paved runway to paved runway, but keeping the nose up is a very common technique when taxiing, taking off and landing on unpaved surfaces to keep the props/engines away from the gravel. Higher nose results in more ground clearance for the engines and also once the ...

Jump to post
by Starlionblue
Fri Mar 12, 2021 1:58 am
Forum: Technical/Operations
Topic: Taxi and Delay Times
Replies: 31
Views: 2695

Re: Taxi and Delay Times

It is complicated. I'm still try to figure out why traffic lights stay red when there is no cross traffic in sight. So if all traffic lights were green and you have two vehicles coming into the intersection from two different directions at the exact same time, do they run into each other because bo...

Jump to post
by Starlionblue
Thu Mar 11, 2021 11:44 am
Forum: Technical/Operations
Topic: Door Latch Question
Replies: 18
Views: 2462

Re: Door Latch Question

fr8mech wrote:
But, that door is latched. The handle just wasn’t stowed properly. Sloppy, but still locked.


Aaaah.

But isn't that just bad handle design? ;)

Jump to post
by Starlionblue
Thu Mar 11, 2021 4:17 am
Forum: Technical/Operations
Topic: Door Latch Question
Replies: 18
Views: 2462

Re: Door Latch Question

https://www.youtube.com/watch?v=X11SFdQqHaI


Ha.

Kind of a big deal if you want to go flying. I don't know the 737 but I imagine you'd get a warning in the cockpit if the door wasn't properly latched.
-->

crownvic wrote:
I guess its no big deal...3:55 into video door latch

https://www.youtube.com/watch?v=X11SFdQqHaI


Ha.

Kind of a big deal if you want to go flying. I don't know the 737 but I imagine you'd get a warning in the cockpit if the door wasn't properly latched.

Jump to post
by Starlionblue
Thu Mar 11, 2021 4:02 am
Forum: Technical/Operations
Topic: what kind of process does a company have to do when she's working on a new livery?
Replies: 25
Views: 2738

Re: what kind of process does a company have to do when she's working on a new livery?

MO11 wrote:
Starlionblue wrote:
I don't think anyone will paint an actual aircraft with a test livery.


There have been plenty.


Fair play. Any examples?

Jump to post
by Starlionblue
Thu Mar 11, 2021 2:54 am
Forum: Technical/Operations
Topic: what kind of process does a company have to do when she's working on a new livery?
Replies: 25
Views: 2738

Re: what kind of process does a company have to do when she's working on a new livery?

Hello, I know that they'll have to produce multiple concept like what the lufthansa and SAS did,but what are the other part of the process? I guess they can test what they come with on real aircraft or aircraft part. Thanks for your answer! This is really no different from any other branding exerci...

Jump to post
by Starlionblue
Thu Mar 11, 2021 1:16 am
Forum: Technical/Operations
Topic: Overloading Airliners - easily possible?
Replies: 13
Views: 2515

Re: Overloading Airliners - easily possible?

I’m curious about the real time performance comparison the newer models are doing. How big of a performance deviation before it alarms? Do modern predictive maintenance systems use this info at all? Most if not all predictive monitoring is around non-structural parts. But it would be interesting if...

Jump to post
by Starlionblue
Thu Mar 11, 2021 1:15 am
Forum: Technical/Operations
Topic: what kind of process does a company have to do when she's working on a new livery?
Replies: 25
Views: 2738

Re: what kind of process does a company have to do when she's working on a new livery?

Hello, I know that they'll have to produce multiple concept like what the lufthansa and SAS did,but what are the other part of the process? I guess they can test what they come with on real aircraft or aircraft part. Thanks for your answer! This is really no different from any other branding exerci...

Jump to post
by Starlionblue
Wed Mar 10, 2021 10:19 am
Forum: Technical/Operations
Topic: Comparing Boeing 787 and Airbus A350 wing design
Replies: 19
Views: 3094

Re: Few questions about the A310 (and A300)

let me repeat: E-Modulus and max elastic deformation is given by the material. CFRP. bending limits are dependent on these material properties. a thinner profile will show more bending under these load conditions. upper and lower skins are nearer to each other and thus the same deformation leads to...

Jump to post
by Starlionblue
Wed Mar 10, 2021 5:23 am
Forum: Travel, Polls & Preferences
Topic: Why no Boeing 707 stretch?
Replies: 19
Views: 3928

Re: Why no Boeing 707 stretch?

. the KC-135 (Boeing model 717*) The official designation of the KC-135 is Boeing 717-148. The twin-engine version of the Boeing 717 aircraft - original MD-95 design - are assigned a -200 designation, I.e. Boeing 717-200, and from a review of the data at rzjets.net, many have the Boeing customer co...

Jump to post
by Starlionblue
Wed Mar 10, 2021 4:31 am
Forum: Technical/Operations
Topic: Engine out actions
Replies: 8
Views: 1709

Re: Engine out actions

Or, as an old instructor engineer used to tell, if you don’t the problem just wait til it gets bad enough to be a recognizable problem and do that procedure. That's a good one. The process of problem recognition is in many ways more crucial and difficult than problem resolution. If you know what th...

Jump to post
by Starlionblue
Wed Mar 10, 2021 2:58 am
Forum: Technical/Operations
Topic: Engine out actions
Replies: 8
Views: 1709

Re: Engine out actions

I would suggest that initially the thrust lever increase could be the auto-thrust increasing to compensate for the speed decay. Subsequent manual intervention, then lower setting / idle for the drift down or descent. We're talking a period of 20 seconds here, from an unexpected event. As said above...

Jump to post