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by kalvado
Fri Jun 17, 2022 5:32 am
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5053

Re: How does the IFE display things like altitude and speed

Why flight data is available to IFE at all? Apparently, when 737 systems were designed, IFE wasn't a real thing. Boeing providing information by redesigning whatever their computing units are called - certified, extremely important units - just to please the pax is totally unlikely. So why the data...

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by kalvado
Fri Jun 17, 2022 5:29 am
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5053

Re: How does the IFE display things like altitude and speed

Burden of proof fallacy... And of course finding all the relevant information requires IFE system manual and full 737 wiring diagram. But it is usual "through obscurity" thing I have a better and more interesting question for you, though. Why flight data is available to IFE at all? Appare...

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by kalvado
Thu Jun 16, 2022 11:42 am
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5053

Re: How does the IFE display things like altitude and speed

Ad hominem fallacy. You're not refuting the actual point. Regardless of how mask deployment works on the NG, the guy in question was lying. There is no way to do what he claimed. That's what many IT guys said. Next thing they learn is it would take $1M to a Bitcoin account to get things back to nor...

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by kalvado
Thu Jun 16, 2022 7:32 am
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5053

Re: How does the IFE display things like altitude and speed

No, because he was caught lying red handed. He tweeted in flight he was on an aircraft and was going to set off the passenger oxygen EICAS. After the United 737 landed, he was arrested, they seized and listed all the tech gear he had including devices, cables, thumb drives. There was no cat 6 cable...

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by kalvado
Thu Jun 16, 2022 1:22 am
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5053

Re: How does the IFE display things like altitude and speed

So you arguments boil down to this guy uses incorrect terminology hence cannot be right. No, because he was caught lying red handed. He tweeted in flight he was on an aircraft and was going to set off the passenger oxygen EICAS. After the United 737 landed, he was arrested, they seized and listed a...

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by kalvado
Thu Jun 16, 2022 12:14 am
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5053

Re: How does the IFE display things like altitude and speed

If my memory serves me right, flight control story was about 757 or 767. At least the story I have in mind was about a newer generation one. Not new enough to be designed with paranoiac data security thoughts, but new enough to have significant computing on board. "no direct link" may be ...

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by kalvado
Wed Jun 15, 2022 3:31 pm
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5053

Re: How does the IFE display things like altitude and speed

That is a good tough question. Of course, I have no rock solid answer for you - such things are generally not becoming public until there is gross problem, like it happened with MCAS. However, my strong impression is that certification system, like any system designed to impose a set of fixed requi...

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by kalvado
Wed Jun 15, 2022 12:16 pm
Forum: Technical/Operations
Topic: Which is the most FUEL EFFICENT REGIONAL aircraft in the world ?
Replies: 16
Views: 2846

Re: Which is the most FUEL EFFICENT REGIONAL aircraft in the world ?

Dear FR, The ATR-72 had been advertized as "the most fuel efficient commercial aircraft" by the manufacturer literally decades ago, sporting an equivalent fuel consumption of "2,5 l/100km per passenger". This is still a good value by today's standards and it was achieved through...

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by kalvado
Wed Jun 15, 2022 11:48 am
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5053

Re: How does the IFE display things like altitude and speed

Do you have any specific examples of "compliance through obscurity"? MCAS I knew you'd say that. ;) And that's fair. However, I see MCAS as an outlier. Any other examples? Honestly curious. That is a good tough question. Of course, I have no rock solid answer for you - such things are gen...

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by kalvado
Wed Jun 15, 2022 1:41 am
Forum: Technical/Operations
Topic: Tail Anti-Ice leading edge question.
Replies: 20
Views: 2178

Re: Tail Anti-Ice leading edge question.

Going back to the metal strip on the fin leading edge, I am fairly sure all A350s come with it. Some operators may just choose to paint it for aesthetics. I can't think of any operators with the strip painted. Which ones are you thinking of? Since it is for erosion protection it is likely that they...

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by kalvado
Tue Jun 14, 2022 7:05 pm
Forum: Technical/Operations
Topic: Tail Anti-Ice leading edge question.
Replies: 20
Views: 2178

Re: Tail Anti-Ice leading edge question.

So of Airbus like I said some 320/330/380 etc operators have either not had that metal strip installed or they have painted it and this includes the newer generation of NEO’s, but yet to see an A350 without it, so wasn’t sure if it was just something airlines have not done yet or chosen not to do, ...

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by kalvado
Tue Jun 14, 2022 1:42 pm
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5053

Re: How does the IFE display things like altitude and speed

This is easy to achieve by the way. My previous job was telematics for tanker trucks and I used this kind of connectors to make sure I cannot send anything to the internal truck CAN bus: https://copperhilltech.com/cancrocodile-contactless-can-bus-reader/ Not this particular one, though. They are es...

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by kalvado
Tue Jun 14, 2022 11:24 am
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5053

Re: How does the IFE display things like altitude and speed

Last time I was talking to an IFE vendor engineer, and he was saying that the interface unit with the aircraft is physically incapable of outputting any signal to the aircraft side so this should not be a problem. This is easy to achieve by the way. My previous job was telematics for tanker trucks ...

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by kalvado
Mon Jun 13, 2022 2:00 pm
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5053

Re: How does the IFE display things like altitude and speed

Most of that is the same information displayed on the cabin displays for the cabin crew. Our cabin crew have to initialise the mast et IFE control with the flight number and destination. I was recalling my memory on that very same screen when writing. And on some setup if the flight crew entered th...

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by kalvado
Sun Jun 12, 2022 11:40 am
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5053

Re: How does the IFE display things like altitude and speed

There was a case of a computer engineer who did manage, apparently, to access more than he should have been able to: https://www.wired.com/2015/05/feds-say-banned-researcher-commandeered-plane/ What he claimed he could do on a real aircraft just is not possible. The IFE is an independent network, i...

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by kalvado
Thu Jun 09, 2022 1:13 am
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6481

Re: Air France 447: 13 years on

What is "still happening despite training programs" is that many regulators and operators don't seem to train in a very rigorous fashion, and adopt punitive approaches to non-normal events Right now, that choosen balance is to give the pilot authority over everything - but at the same tim...

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by kalvado
Wed Jun 08, 2022 11:39 am
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6481

Re: Air France 447: 13 years on

Can we stop with the skygod references, it seems like an underhanded insult against people who have acquired different skills. Point I am trying to test is that " human as the ultimate solution " approach is the biggest philosophical problem in flight control flow. It doesn't matter how y...

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by kalvado
Wed Jun 08, 2022 10:47 am
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6481

Re: Air France 447: 13 years on

What is "still happening despite training programs" is that many regulators and operators don't seem to train in a very rigorous fashion, and adopt punitive approaches to non-normal events Right now, that choosen balance is to give the pilot authority over everything - but at the same tim...

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by kalvado
Wed Jun 08, 2022 3:22 am
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6481

Re: Air France 447: 13 years on

There is no assumption that humans are superior. The autopilot can fly the plane more accurately than we can. However, the autopilot can only do so with valid inputs. If the inputs are not valid, keeping the autopilot is very dangerous. As my first flight instructor said, "Remember, the autopi...

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by kalvado
Mon Jun 06, 2022 1:49 pm
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6481

Re: Air France 447: 13 years on

You don't need to be Chuck Yeager to deal with unreliable airspeed, especially if, as in this case, you know it is unreliable. You do need training. The pilots would also not have speed data. But they did have a methodology to deal with the issue that the flight control and autoflight systems lacke...

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by kalvado
Sun Jun 05, 2022 4:19 pm
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6481

Re: Air France 447: 13 years on

Then we have a disagreement—pilots should be perfectly capable of flying the plane without the autopilot system keeping them out of trouble. An old school position, possibly. I totally hear you. However, everything and everyone fails once in a while (says a guy who accidentally tore 5/8" harde...

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by kalvado
Sun Jun 05, 2022 2:51 pm
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6481

Re: Air France 447: 13 years on

The “computers” had the all the authority they needed to do their task—straight and level, in trim. When they lost a vital piece of information, they said “we can’t do our task any longer, you try it human”. Human only had do nothing, leave the thrust at cruise setting, maintain attitude, wait unti...

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by kalvado
Sun Jun 05, 2022 2:18 pm
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6481

Re: Air France 447: 13 years on

Give computers more authority and the risks grow rapidly. AF447 was in trim and at a usable thrust setting for the conditions. If the pilots did nothing, they’d have landed at CDG. The “computers” were fine until the pilots added inputs which were not designed for—large pitch up beyond the performa...

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by kalvado
Sat Jun 04, 2022 9:06 pm
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6481

Re: Air France 447: 13 years on

I suspect "human is superior" assumption is the biggest design flaw here I myself don't feel "superior", and I think it would be the case for most of pilots as well. But we, as humans, have an ability to assess large amounts of data and predict an outcome - a thing I refer to as...

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by kalvado
Sat Jun 04, 2022 1:18 pm
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6481

Re: Air France 447: 13 years on

You don't need to be Chuck Yeager to deal with unreliable airspeed, especially if, as in this case, you know it is unreliable. You do need training. The pilots would also not have speed data. But they did have a methodology to deal with the issue that the flight control and autoflight systems lacke...

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by kalvado
Sat Jun 04, 2022 12:53 am
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6481

Re: Air France 447: 13 years on

I guess your answer emphasizes two approaches to automation. Not only in plane FBW, but as a wider question, perhaps for automotive industry and also other. Do we want the computers to offload work and allow humans to concentrate on non-standard situations, or should the computer assist be there al...

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by kalvado
Fri Jun 03, 2022 10:53 am
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6481

Re: Air France 447: 13 years on

That's what I tried to say: the envelope protection system that would have saved the aircraft was not working (or not fully). It was just my 2 cents on the debate about whether there should be more or less automation. I guess your answer emphasizes two approaches to automation. Not only in plane FB...

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by kalvado
Mon May 30, 2022 7:40 pm
Forum: Technical/Operations
Topic: Dirty airplanes
Replies: 11
Views: 3806

Re: Dirty airplanes

Currently, WN has the advantage of not running scheduled redeyes, allowing them to perform maintenance overnight and potentially wash aircraft more frequently I wonder what is the percentage of US3 aircraft doing red-eyes. I would think a relatively small fraction. Well, I'd say most of mainline ai...

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by kalvado
Mon May 30, 2022 11:24 am
Forum: Technical/Operations
Topic: Dirty airplanes
Replies: 11
Views: 3806

Re: Dirty airplanes

I’ve noticed the same thing. I was at ABQ today and was shocked how dirty the Mesa E175s I saw were. Absolutely filthy. I would assume WN birds are equally filthy but the blue fuse hides dirt better. Currently, WN has the advantage of not running scheduled redeyes, allowing them to perform maintena...

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by kalvado
Sun May 29, 2022 11:59 am
Forum: Technical/Operations
Topic: 737 spoiler mixer / ratio changer question.
Replies: 6
Views: 2104

Re: 737 spoiler mixer / ratio changer question.

As for maintenance manual, this weak signal may be a good diagnostic metric for some reason. For example, weak can become zero if there is any problem with flow or alignment...

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by kalvado
Sat May 28, 2022 3:29 pm
Forum: Technical/Operations
Topic: Static wicks and electric GA aircraft...
Replies: 5
Views: 1640

Re: Static wicks and electric GA aircraft...

It will not work.

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by kalvado
Sat May 28, 2022 2:33 pm
Forum: Technical/Operations
Topic: Is an Aircraft Perfectly Balanced 50/50?
Replies: 17
Views: 2244

Re: Is an Aircraft Perfectly Balanced 50/50?

You will get a fuel imbalance alert if your tank balance left/right exceeds a threshold. Can you give an idea of what that threshold is? I suspect around 1% of max fuel or so? From here https://www.boeing.com/commercial/aeromagazine/aero_09/fuel_textonly.html This table for example https://www.boei...

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by kalvado
Fri May 27, 2022 8:08 pm
Forum: Technical/Operations
Topic: Is an Aircraft Perfectly Balanced 50/50?
Replies: 17
Views: 2244

Re: Is an Aircraft Perfectly Balanced 50/50?

For an aircraft athwartship CG is not as critical as it is for helicopters We care where CG is longitudinally but don’t consider where it is left/right of the buttline. You will get a fuel imbalance alert if your tank balance left/right exceeds a threshold. Can you give an idea of what that thresho...

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by kalvado
Fri May 27, 2022 7:34 pm
Forum: Technical/Operations
Topic: Is an Aircraft Perfectly Balanced 50/50?
Replies: 17
Views: 2244

Re: Is an Aircraft Perfectly Balanced 50/50?

Given latest discussion about manufacturing tolerance affecting empty weight, as well as design asymmetry - such as different doors for R1 and L1, I doubt there is a perfect symmetry.
Arm is small, as it was pointed out, so effect is limited

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by kalvado
Wed May 18, 2022 5:46 pm
Forum: Technical/Operations
Topic: Why does a 737-700 use flap 1 and not zero flap for take off?
Replies: 23
Views: 3477

Re: Why does a 737-700 use flap 1 and not zero flap for take off?

You don’t understand take-off performance—the 737 will do better with a de-rate simply because of Vmcg will be lower and the plane won’t have to accelerate to the higher Vmcg. Also, don’t confuse AEO run with take-off distance required which plans for the OEI case. Do I understand it correctly that...

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by kalvado
Tue May 17, 2022 7:58 pm
Forum: Technical/Operations
Topic: Why do we "check in?"
Replies: 72
Views: 8451

Re: Why do we

Are you sure? Yes, QF for example does not sell standby fares however they have a number of different waitlist/standby options I think that’s kinda rare though isn’t it? I’ve never known the other airlines, VB/VA, Jetstar, Tiger etc offer them or have ever seen anyone lining up waiting for a standb...

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by kalvado
Tue May 17, 2022 2:43 pm
Forum: Technical/Operations
Topic: Why does a 737-700 use flap 1 and not zero flap for take off?
Replies: 23
Views: 3477

Re: Why does a 737-700 use flap 1 and not zero flap for take off?

Furthermore, I suspect the amount of lift - and hence lift induced drag - produced by the wing is not too significant prior to rotation. Regards, JetMech And I would think we want it that way. Another datapoint for the lift generated is that a clean wing in cruise produces 1g at about zero pitch. A...

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by kalvado
Tue May 17, 2022 1:34 pm
Forum: Technical/Operations
Topic: Why do we "check in?"
Replies: 72
Views: 8451

Re: Why do we "check in?"

But should they have that right? After all you paid for that seat, regardless if you use it or not. If you don't use it, you paid for that seat to be empty. Not for it to be reassigned. If you cancel your flight before departure, your ticket retains value as a voucher for future travel. If you don’...

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by kalvado
Mon May 16, 2022 6:52 pm
Forum: Technical/Operations
Topic: Why does a 737-700 use flap 1 and not zero flap for take off?
Replies: 23
Views: 3477

Re: Why does a 737-700 use flap 1 and not zero flap for take off?

I suspect leading edge role, at least partially, is to kill lift (hence drag - while also improving traction) during takeoff roll. I'm really not sure about this. I can understand killing lift upon landing to get as much weight on the wheels and increase traction for braking, but takeoff? Regards, ...

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by kalvado
Mon May 16, 2022 1:29 pm
Forum: Technical/Operations
Topic: Why does a 737-700 use flap 1 and not zero flap for take off?
Replies: 23
Views: 3477

Re: Why does a 737-700 use flap 1 and not zero flap for take off?

To increase the AoA margin, doesn't the slat have to be fully deployed to open the slot and thus provide increased AoA margin by accelerating the air through the slot, reenergizing the boundary layer? Slats increase the useable AOA in the sealed position. This is due to the increase in leading edge...

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by kalvado
Mon May 16, 2022 2:38 am
Forum: Technical/Operations
Topic: Why does a 737-700 use flap 1 and not zero flap for take off?
Replies: 23
Views: 3477

Re: Why does a 737-700 use flap 1 and not zero flap for take off?

While it's an interesting academic question to ask, the first question is what benefits may be realized from the configuration IF it were possible. What were you thinking the benefits are/were? I'm just not getting what those might be. The 737 reaches flat retraction speeds very quickly even at red...

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by kalvado
Mon May 16, 2022 12:01 am
Forum: Technical/Operations
Topic: Why does a 737-700 use flap 1 and not zero flap for take off?
Replies: 23
Views: 3477

Re: Why does a 737-700 use flap 1 and not zero flap for take off?

Since Flap 1 extends the LE devices I'd say that there'd be considerably more than just 'a small amount of extra lift generated'. The leading edge devices don't so much increase lift as increase the AoA margin, though of course as you "use" the higher AoA, you do get more lift. Either way...

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by kalvado
Sun May 15, 2022 2:41 pm
Forum: Technical/Operations
Topic: Why do we "check in?"
Replies: 72
Views: 8451

Re: Why do we "check in?"

As for identifying criminals, many (but not all) countries require you to scan your boarding pass as you go through airport security to enter airside, so at the very least the capability exists to identify members of the FBI Most Wanted list that are in the airport. Someone on FBI most wanted list ...

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by kalvado
Sun May 15, 2022 6:54 am
Forum: Technical/Operations
Topic: Why do we "check in?"
Replies: 72
Views: 8451

Re: Why do we

Well, I was only joking. But all jokes aside, I think it’s only US airlines that offer standby seats? I know they don’t do it in Australia anyway. Miss ya flight and she’s an empty seat. There is standby seats available in Australia both domestically and internationally. Busy times of the year, or ...

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by kalvado
Fri May 13, 2022 8:38 pm
Forum: Technical/Operations
Topic: Why do we "check in?"
Replies: 72
Views: 8451

Re: Why do we "check in?"

Whether we do it in person at the airport, at home on our phones or via an in-airport kiosk, you can't fly until you check in. But why? What mechanisms are set in motion when we "check in"? Or, put another way, what happens if we don't? For security and logistics they need to know who’s “...

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by kalvado
Fri May 13, 2022 3:00 pm
Forum: Technical/Operations
Topic: Why do we "check in?"
Replies: 72
Views: 8451

Re: Why do we "check in?"

Part of it is the security aspect too - you need to know who exactly is onboard. Hold baggage needs to be reconciled with customers onboard, and those who don't board need their bags offloaded. Think back to Air India 182 or Pan Am 103. Another reason is airlines perform a check of travel documenta...

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by kalvado
Tue May 10, 2022 7:30 pm
Forum: Technical/Operations
Topic: 738 broken drain mast heater
Replies: 8
Views: 2647

Re: 738 broken drain mast heater

ikolkyo wrote:
Speed is probably just a factor flying westbound, you hit headwinds flying west.

original poster says their AIRspeed was 400 mph (?).
If I remember correctly from my last flight into a wind, 738 IFE system was showing both airspeed and ground speed as separate values.

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by kalvado
Tue May 10, 2022 5:02 pm
Forum: Technical/Operations
Topic: Missed approach point ground device - Harmful?
Replies: 9
Views: 2309

Re: Missed approach point ground device - Harmful?

According to this https://www.cfinotebook.net/notebook/avionics-and-instruments/instrument-landing-system , marker beacons have a power output of 3 watts or less. That's pretty low. Wifi router has 100mW output (per channel?), but is usually closer. power goes down as 1/r^2, so 3 watt source - if i...

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by kalvado
Tue May 10, 2022 4:52 pm
Forum: Technical/Operations
Topic: Missed approach point ground device - Harmful?
Replies: 9
Views: 2309

Re: Missed approach point ground device - Harmful?

Dear all, can anybody share any info about missed approach ground devices? I'm not a pilot so my terminology might be a bit off here. There's one nearby and you can have a look at it with google maps https://www.google.com/maps/place/Via+Giovanni+Berchet,+San+Giuliano+Terme+PI/@43.7203517,10.432307...

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by kalvado
Mon May 09, 2022 2:03 am
Forum: Technical/Operations
Topic: Double-hinged flap explained or shown??
Replies: 9
Views: 1447

Re: Double-hinged flap explained or shown??

As far as I understand, dc-10 has Fowler flaps which pivot on a hinge below lower wing surface. While mechanics is totally unlike flap tracks used on today's A-B jets, surface movement is somewhat similar. There are no slots to be seen, but mechanics looks like that could be incorporated. I can ima...

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