Boeing Facts - Black lines on the wings

  • Published on Apr 6, 2018
  • Sponsor:
    On the wings of the Boeing 737NG's there are some curious black lines painted. They form boxes with some irregular shapes towards the back of the wings.
    What are the purpose of those lines and can you really de-ice a Boeing 737 wing using Flower-spray cans?
    These are some of the questions I will be coveing and explaining in todays video.
    There are more videos coming up soon in my series about the Boeing 737 and its fantastic design so stay tuned!
    To download my FREE app, use the links below! 👇🏻
    A huge thank you to the following channels that I have borrowed some clips from:
    8K Next:

Comments • 840

  • Bill Bright
    Bill Bright 16 days ago

    The temperature shocks our aircraft deal with daily as well as pressure changes are a testament to the marvelous marvels that our air-fleets really are. Their metal is tested on each flight ✈️.
    The Consolidated Vultee. “ Liberator “ of WW II had to rely on vacuum operated rubber boots on flight surface leading edges. They would inflate to break off ice formation. The propellers had deicing slipper rings to flow on deicer from tanks. Carburetor icing a constant threat as well. Engine heat used to combat this. Water in fuel an absolute no no.
    The crew was on their own to try and stay warm in an unpressurized, unheated, very drafty noisy aircraft. 30’000 feet up at 45 below zero at 140 knots for six hours,,, burrrr 🥶 cold!

  • Mee Hee
    Mee Hee 21 day ago

    I wish university lecturers were even half as good as you in explaining things. You explain complicated things really well. Thanks for your work.

  • tchevrier
    tchevrier 22 days ago

    -43 C ?
    That's the lowest the fuel is allowed to get? It can pretty much reach that just sitting on the tarmac here in Winnipeg. We had temperatures this winter reach -40C

  • LetzPlaySmiley YO
    LetzPlaySmiley YO 22 days ago

    what's his real name ?

  • J kK
    J kK Month ago

    How about making it possible for pilots to know when they lose an engine (like, falling off the plane). My understanding is that when they experience engine failure, they don' t know whether the engine just stopped working or it actually falls off the wing. Case in point. A few years ago a DC 10 was taking off from Dallas on its way to CA and the pilots experience a left engine "failure." But what they didn't know was the engine actually broke off the wing because from the cockpit, pilots can't see their engines. How about some one kind of "rear-view" mirror to eliminate this issue???

  • kofManKan
    kofManKan Month ago

    Great channel, keep it up fella!

  • yatish kumar
    yatish kumar Month ago

    My daily routine: waking up , going to college , return to hostel, taking dinner , watching a video of mentour pilot , sleeping. I think if I follow this same schedule, I might become master in airplane technology.😂😂

  • Mohammed Monkey Scrotum

    Black lines on wings matter!!!

    SHUTTMAN 2 months ago

    Can you explain the engine display things? (N1 N2 EGT, ETC)

  • Tobias B.
    Tobias B. 2 months ago

    but why does it say "DO NOT WALK OUTSIDE THIS AREA"? I guess it isn't for structural reasons since there's a lot more force applied during cruising speed than from an average human

  • Tom Manion
    Tom Manion 2 months ago

    Your statements are not the primary purpose of these black lines. They date back to WW-II prop jobs. They are "Walk Way" lines. They define where on the aircraft it is safe to walk without fear of causing damage to the aircraft structure. In the case of the wings, these lines generally corresponds with the fuel cells. If one can see them, the upper surfaces of the horizontal stabilizers also have black "walk way" lines. Even, in some cases, one side of vertical stabilizers have them, such as the left side of the Boeing 707 family of jet aircraft. This was due to the stabilizers were designed to fold down to fit in the hangars of the day.

  • Brother Michael of the Cross

    What does the second number in a plane's name mean, IE, 737-400?

    • Brother Michael of the Cross
      Brother Michael of the Cross 18 days ago

      +Michael Hall Appreciate the info :)

    • Michael Hall
      Michael Hall 22 days ago

      Brother Michael of the Cross: 737 is the model and the 400 (or 200 or 800, etc.) is the series. Airbus uses different model numbers for the various variants. The A318 to A321 are essentially the same aircraft just different lengths with the same engines.

  • Ivar the Boneless
    Ivar the Boneless 3 months ago

    seems like you're pretty knowledgeable about airplanes. why don't you explain how ice water crystal condensation remains in the air all day and expands into giant clouds. I'll start it off for you, it's not ice crystals because ice crystals disappear within a couple minutes you know like we always saw when we were kids. explain to me why airplanes are dropping barium aluminum and strontium along with other components in these chem trails ( oh I'm sorry Geoengineering to be politically correct). I know a couple of the reasons at least. the UN is blocking out the Sun and controlling the weather with them. don't believe me look at some of the stuff Harvard has been releasing about blocking the Sun and freezing the planet something we have been putting on blast for years and it is just come to surface in the mainstream.

    • Ivar the Boneless
      Ivar the Boneless 3 months ago

      also why don't you explain to me what these giant black lines that stretch as far as the eye can see in front of these planes are? I've seen it with my own eyes it's like some sort of a marker the plane is following. this is a legitimate question because it occurred to me that Shadows do not cast in the sky. and I have not found any particular light-ray that creates this effect.

  • Jack Turner
    Jack Turner 3 months ago +1

    Can you do a smooth landing? lol 😂😂😂👨🏻‍✈️✈️

  • Evan N
    Evan N 4 months ago

    Are you a Ryanair pilot

  • Lawrence Darbyshire
    Lawrence Darbyshire 4 months ago

    Why do some 737 Ray Domes have black circles around them and others do not? What is the purpose of the Black ring for those that do have it?

  • Studyin’Me
    Studyin’Me 4 months ago

    What about the black rectangle on the 777 wing

  • MWB Gaming
    MWB Gaming 4 months ago

    i always thought those lines marked where the spars were so ground crews that needed to walk on the wing for whatever reason, could walk along the strongest part to avoid damaging it

  • tiffany51793
    tiffany51793 5 months ago

    Hi! May I know what about in Airbus? any black lines?

  • tryithere
    tryithere 5 months ago

    Do they heat the fuel before it goes into the combustion chamber on a plane?

  • Big Squeeze
    Big Squeeze 5 months ago

    I'd think just a LITTLE lightweight insulation would help. Maybe the outer wing skin IS the fuel tank???

  • daniel kinney
    daniel kinney 6 months ago

    GINGER this guy is so handsome

  • Mark Webster
    Mark Webster 6 months ago

    What is that mini turbine that pops out below the plane in an emergency? 🤔

  • William Southard
    William Southard 6 months ago

    Love the info, I always wondered about these things , great job thanks.

  • Peter
    Peter 6 months ago

    Why not heat the fuel tanks?

  • tradjazzer
    tradjazzer 6 months ago +1

    very interesting, thank you.

  • Internet Quality Police

    I downloaded the App. It spammed the shit of of me, so I deleted it. But some of these videos I find quite interesting. They answer questions I didn't know I had.

  • AutoPilot Weekly
    AutoPilot Weekly 6 months ago +1

    Good job man🛫

  • Anyone
    Anyone 6 months ago

    If you're in a hurry it's at 5:39

  • Hofner Bass
    Hofner Bass 6 months ago

    Get to the point more quickly.... at times, it's painful to watch

  • Jvlivs Caesar Gaius
    Jvlivs Caesar Gaius 6 months ago

    I heard the Idiot Prime Minister of Canada calls this guy, "Peopletour Pilot" to make it gender neutral Ha Ha. Trudeau's brain is on "Neutral"

  • Eliot Francis
    Eliot Francis 6 months ago

    Excellent clear explanation. Thanks for posting.

  • catpowerro1110
    catpowerro1110 6 months ago

    Can you descent up?

  • king513 king513
    king513 king513 6 months ago

    one I noticed to all these youtube presentors. they just want to talk and prolong their faces on the screen. BLAH BLAH BLAH BLAH BLAH BLAH...Am I the only one who noticed that.... Blah blah blah blah and all about blah blah blah blah..
    why not go straight to the point.... the black lines are for people not to walk beyond and foreign matter should not be present on those lines. period.

  • carolyn haney
    carolyn haney 6 months ago

    I am offended by your Budda in the background. Budda is dead and he was a false god therefore and sending people to Hell.

  • Hanz Choloburger
    Hanz Choloburger 6 months ago

    I am a first time subscriber!!!I love what you said!!

  • MJ Phillips
    MJ Phillips 6 months ago

    One would think they would have come up with fuel cycling to a warmer center tank and into the outer tanks.

  • Ramesh S
    Ramesh S 6 months ago

    Just wondering can the critical areas of the wings heated using heat from the engine or some other device like the pitot tube.

  • Deryl Van Clieaf
    Deryl Van Clieaf 7 months ago

    Why not just paint the wing black? Or use heat absorbing materials

  • Mishka
    Mishka 7 months ago

    sounds like a fairly easy issue to address....just add a wire mesh heater blanket to the tanks.....a little weight but not much....

    TORMY VAN COOL 7 months ago

    -56° you meant ... :)

  • Bill Woo
    Bill Woo 8 months ago

    One of the most fascinating technical explanations yet on the channel - and that is saying a LOT. This is the most consistently interesting channel of any discipline. It's always, always interesting, relevant, understandable, sometimes strongly surprising, and always, always, on a topic that I either have wondered about for years, and if not, something that I became fascinated with during the podcast.
    So after seeing so many wondrous, outstanding videos on Mentour, to say this is one of the most fascinating, as he explains the sloshing and frost issue - that's saying a LOT.

  • Barbara Iverson
    Barbara Iverson 8 months ago

    Was the increase in efficiency of the wing worth the time and expense of the additional de-icing that the thinner design requires?

  • Jamal Turner
    Jamal Turner 8 months ago

    I always thought it outline the fuel tanks in the wing

  • William Russ
    William Russ 8 months ago

    Once in Accra, Ghana, my PrivatAir (contracted by Lufthansa) pilot had the plane de-iced even though it was 30c outside.

  • my name
    my name 8 months ago

    Does the temperature of the fuel have any influence on hoses, rails, the engines? Does the fuel expand or shrink in volume because of the temperature? The fuel itself doesn't freeze I guess?

  • Grumpy Oldfart
    Grumpy Oldfart 8 months ago

    Don't 737's have fuel re circulation valves to keep fuel warm by passing the fuel through heat exchangers?

  • tie oneon
    tie oneon 8 months ago

    So you take off on a good weather day you're way up there and precip...unexpected...occurs and the wings get wet and then b/c of the air temp the freeze happens ...what is the procedure there any while in the air? thanks

  • Agent Bertram
    Agent Bertram 8 months ago

    Do you not have de-icing heat pads built into the wing under the outer skin?

  • Shaukat Ali Khan
    Shaukat Ali Khan 8 months ago

    explained very Well (Nice)

  • violaorulez
    violaorulez 8 months ago

    while at the gate, ground personel or the flight crew might be inspecting the wings. But what if they get iced while heading to the runway? who is looking them?

  • Paris Hilarion
    Paris Hilarion 9 months ago

    two questions please:
    1. if the fuel is cold inside the tanks, how long will the de-icing last before the ice forms again? What exactly is the de-icing fluid, because you said it is bad for the environment?
    2. Why the engineers do not use some form of heating (via a heat exchanger) to warm up the fuel faster, inside the tanks? I assume you may say there is a fire hazard from electricity, but how about refrigerant or other medium?

  • abreeq chaudhry
    abreeq chaudhry 9 months ago +1

    ive been watching you for 3 years

  • Turbo Mini TV
    Turbo Mini TV 9 months ago +1

    Why not just heat the fuel via a heat exchange using waste engine heat?

    • Turbo Mini TV
      Turbo Mini TV 9 months ago

      Ahh ok, thanks for the reply. I suppose the huge amount of cold air blasting over the wings has rather a big cooling effect.

    • Mentour Pilot
      Mentour Pilot  9 months ago +1

      We do use the oil to partly heat the fuel but the volume is just to big.

  • James Avram
    James Avram 9 months ago

    I am a Boeing quality inspector currently working on the 737 lines in Renton,WA. I’ve been with both McDonell Douglas and Boeing for over 28 years working on and inspecting Aircraft. That being said your videos I find are around 99% accurate and well narrated with good explanations. Keep up the great work as your helping the flying public understand why it is we do things and how it affects them!

  • robert hensen
    robert hensen 9 months ago

    the black lines sound like a bandaid for a desine floor

  • cmetube
    cmetube 9 months ago

    The Boeing 737-700 sucks. Admit it. Boeing cheats and designed a bad plane. They are too cheap to replace it. Black lines are the worst of all engineering hacks, defrauding customers, airports and regulatory bodies.

  • Rudolf Abelin
    Rudolf Abelin 9 months ago

    Thank you Petter! I now understand the helicopter scene, after many years, in "The Day After Tomorrow". I really thank you!!!

  • Comic Book Guy
    Comic Book Guy 9 months ago

    I've always wondered what those big, long, flat things, which stick-out from the sides of the plane, are; what do call them, wangs?

  • Greg Faris
    Greg Faris 9 months ago

    For those of you who could not understand his accent, he is saying “Cold Soak Fuel Frost”. Excellent video otherwise. Thanks!

  • mrxexes
    mrxexes 10 months ago

    Hi I am a casual watcher, who finds your videos very fascinating.
    But I have a question (forgive me if its a silly one), is it possible and/or cheaper to have some sort of heating element on the wings to cut down wing freezing?

  • Igor Kosarev
    Igor Kosarev 10 months ago

    very good explanation!) TNX

  • Mikey Mike
    Mikey Mike 10 months ago

    Maybe a silly question, but could they not use heaters in the tanks? Or would they still not be efficient enough to warm the fuel?

  • Les B
    Les B 10 months ago

    Off-topic, but something I like is when taxiing, if already cleared for takeoff before final turn into the runway the pilot will kick the engines up while still in that last turn. That is SO COOL.

  • LancerStride !
    LancerStride ! 10 months ago

    What about that auto de-ice... (I dont know the technical term) when the engine bleed blows hot air over the control surfaces? I thought that was the norm now?

  • Mark Hammer
    Mark Hammer 10 months ago

    Your videos are totally awesome except I think my family thanks I'm watching porn.

  • Alexander Russkov
    Alexander Russkov 10 months ago

    Thank you for explanation, but I think, the principal reason is not frosting itself (of course, it has effect), but functioning of high-lift devices in wings. Also frosting takes place during flight at altitudes some kilometers due to presence of supercooled water. So aircraft has heating systems to prevent frosting in critical regions. From your explanation frosting during landing is critical only for next take-off, so in warm weather one should just wait for frost to melt, if he doesn't hurry?

  • René Gerritsen
    René Gerritsen 10 months ago

    But there is so much heat coming off the engines. I know you use that heat to de-ice the leading edge, why not use a heat exchanger to heat the surface area of the wings above the tanks?

  • Tony Yomomma
    Tony Yomomma 10 months ago

    Those are the tanks that hold the chem trail chemicals. Don’t believe this guy.

  • Angie Labelle
    Angie Labelle 10 months ago

    What is the name and artist of your theme music? It's infectious! Can I buy it somewhere?

  • Pete Sheppard
    Pete Sheppard 10 months ago

    It seems crazy that a thin, almost invisible layer of frost can kill the lift and keep a plane from taking off, but that is absolute truth. As a general aviation pilot, I've had to scrape frost off more than once. Some small airports use an alcohol solution applied with a hand sprayer to deice GA aircraft

  • Chaos Fox
    Chaos Fox 10 months ago

    Is there a reason airplanes cannot be fitted with the same kind of lines on the back windows of some vehicles to help with defrosting?

  • tiortedrootsky
    tiortedrootsky 10 months ago

    Very interesting

  • T Rex
    T Rex 10 months ago

    @mentour aviation how come Boeing stuck with the thinner wing design when they realised the wing icing effect?

  • John Wright
    John Wright 10 months ago

    I would think that heater strip elements of some sort could be imbedded into the surface of the wings to assist in deicing them, similar to the defrost elements imbedded in the back window of many automobiles.

    EMU EMPIRE 10 months ago +1

    Can you do a video on the 777x. I would love to learn more about the folding wing tips

    • Mentour Pilot
      Mentour Pilot  10 months ago

      am no expert but I will see what I can do.

  • riphaven
    riphaven 10 months ago +1

    remember, "BLACK LINES MATTER"

  • Fire Horse
    Fire Horse 10 months ago

    Why are there black holes in space ?

  • HP McDoogle
    HP McDoogle 10 months ago

    Question: Why is there a black circle painted on some 737 nose cones?

  • Brian Rogers
    Brian Rogers 10 months ago

    Have they thought of heat tracing the wings?

  • Shawn Elliott
    Shawn Elliott 10 months ago

    I figured they outlined the fuel tanks, I just didn't know why.

  • dannydaw59
    dannydaw59 10 months ago

    Why not just put heating elements in the wings like a electric blanket? Saves time and money and more convenient for the pilot. The process could be automated.

  • Kandela Brown
    Kandela Brown 10 months ago

    Can’t the fuel be warmed up with a heater gadget?

  • qiansview
    qiansview 10 months ago

    Do you need to de icing the fuselage or any other part of the aircraft?

  • Sven Derfoldy
    Sven Derfoldy 11 months ago

    Thanks, I always though they were check strips across rivits to visually see rivit cracks

  • Johnny Draco
    Johnny Draco 11 months ago

    How are the wings attached to the body of the plane?
    What is the "average" weight of each wing when fully loaded?
    The frame of the plane, both body and wings, is made of what metal?
    What is the average thickness of the wings?
    Besides "fuel tanks" in the wings, how many miles of electrical wiring does each wing have? How many electrical "controls"?

  • 123456785534
    123456785534 11 months ago

    I like boeing 737 some day I like to meet you in person

  • Yıldıray Öztürk
    Yıldıray Öztürk 11 months ago

    What about fuel warming in this thinner wings. How is a plane affecting from this ? For example you are in Doha , outside is 50 celsius and your plane is waiting 6 hours for take off ?

  • Stephen Woods
    Stephen Woods 11 months ago

    I wonder how difficult it would be to provide some heating elements on the outside of the fuel tanks but inside the skin of the wings to control the icing better? Would it be cheaper and easier and better for the environment?

  • Steven Franklin
    Steven Franklin 11 months ago

    What are the black lines on airbus planes for?What are the black lines on a Boeing 757 767 777 for?What is the black line close to the wing evacuation arrows for?

  • Steven Franklin
    Steven Franklin 11 months ago

    What are the black lines on airbus planes for?What are the black lines on a Boeing 757 767 777 for?What is the black line close to the wing evacuation arrows for?

  • Daniel Ljungmark
    Daniel Ljungmark 11 months ago

    I once flew from Sturup to Las Palmas with a MD83. Due to headwind we needed to land in Faro, Portugal, to fill up the tanks. Before takeoff the captain took a bottle of vodka from the taxfree trolley and put it on the Wings as de-iceing 😂. I saw it with my own eyes and he actually explained for us what he’d been doing. This was 1994.

  • Josip Vrandecic
    Josip Vrandecic 11 months ago

    Thanks a lot Sir !

  • Interstellar Axeman
    Interstellar Axeman 11 months ago

    You explain things very well...concise, easy to comprehend, and pleasantly clear. Great new channel for me..

  • yendak
    yendak 11 months ago

    Is there a video about why ice on the wings is undesired, maybe even dangerous?
    Does it affect aerodynamics so heavily?

    • mako88sb
      mako88sb 11 months ago

      Yes, it can certainly cause problems. There are some Air Crash Investigation or Mayday episodes that talk about it. Google "Mayday S09E06 Snowbound Cold Case" and "Air Crash İnvestigation ~ S07E08 Frozen in Flight"

  • zenosxr
    zenosxr 11 months ago

    Love your video's.. I initially wanted to be a commercial pilot but in my country they no longer offer financial aide for this and you are just expected to do it after military service or pay your way through...I love flight and flying, but most of my time has been spent in simulators unfortunately.

  • MovieMan1953
    MovieMan1953 11 months ago

    Thanks to people like you, I learn something every day !!!

  • keith beattie
    keith beattie 11 months ago

    Great explanation again, keep up the good work.

  • Folk
    Folk 11 months ago +1

    Is it not a practical solution to port som of the heat produced by the combustion to the tanks, preventing the fuel from reaching this low temperature? I.e some kind of heat exchanger tubing?

    • Mentour Pilot
      Mentour Pilot  11 months ago +1

      It is actually being done by using the fuel to cool the oil and fuel pumps but the amount of fuel makes it impossible to hear it all.

  • Johnnie Welborn, Jr.
    Johnnie Welborn, Jr. 11 months ago

    Very intriguing and well explained. The 737's have always been my favorite birds but I never really investigated the design differences in the NG's. Always a pleasure to get a few minutes to watch your different subjects, though, even though I'm not likely to ever fly anything GA with the least bit of deicing capability. I'll certainly think about it the next time I deliver one of Global Ground Support's deicing trucks, though (I've hauled several out of Olathe, KS to various US airports). Thanks for sharing these vids. :)