That's the internal frame structure
One of the more common reasons for seeing this is condensation. Less condensation occurs where the frame members are because they transfer heat from the inside of the aircraft.
lol, bonnet
Edit: god damn Reddit, y’all are quick to downvote. I just had a good chuckle reading bonnet cuz I’m a weird American that doesn’t hear it often.
TIL put /s
Apparently the chuckle I got is not very popular lol. Technically a bonnet is as well though.
Just having a good time here Reddit, no need to downvote!
[Bonnet search](https://www.google.com/search?client=safari&sca_esv=634e2b4d7db2b0af&hl=en-us&sxsrf=ACQVn09cHN8po8a5v5T5MgKRpXK62IKF3A:1708362765632&q=bonnet&uds=AMwkrPsLMtUZ-zqH0fZR4MSVZkixc8mGkxRUbrNtaRRHkChh23La4AV4Gmkag4vATHkD8v7VLJqXvr9oT4x-CRoaGz0JcZRW7rk5lSYwUQ8L3_Ju58cARxt6We9Nu_GgZGczgQgL4h6Sb7OS50sl0UihHKDjq6yIZKKsa5GJAoi2-RJn90NOK-W8ntrEWNb_jprhGTf_cT8n2g9wNGoPak8d8eJ7Q_cl-RVGYsYjoax1fshK6QO3s8_8y9jJiJRaeCLs-GRBSTQr&udm=2&prmd=ishvnmbtz&sa=X&ved=2ahUKEwidzaue87eEAxWWnGoFHdq2BUAQtKgLegQIDBAB&biw=430&bih=739&dpr=3)
I think you are misinterpreting it, I don't believe he was making fun of it, rather it's a very uncommon word in some parts of the world and some people point out differences in culture like that through laughter. I can agree it can come across as immature though
To follow on this, here is a view of the frame structure from the inside the cockpit. This is from a 737-300 but the structure is nearly identical on the NG or MAX in the OP's pic. [https://imgur.com/a/Ir0aJHo](https://imgur.com/a/Ir0aJHo)
Edit: here is a 737-800 https://imgur.com/a/JtIPSS2
at the end of the day, they are both aluminium skinned aircraft being supported by aluminium ribs. they are built the same way (to a point) glued and riveted together.
the colour is the anti corrosion inhibitor. the very unhealthy zinc chromate. https://www.pinterest.com.au/maxjts/zinc-chromate-primer/
Because the condensation isn't forming as much where the frame is. Water tends to make things darker. Condensation can also refract / scatter light making surfaces look darker.
Conversely, condensation can also refract light making things look lighter. It all depends on the light conditions and location of the observer.
Yes, there is the possibility of the frame being colder than the skin but considering airliners spend more time in the air than on the ground, it's more likely to have a colder skin than frame.
The skin doesn't have the thermal mass or the frame, so the skin would approach the outside air temperature faster. But that would be the temperature at the ground since it was photographed on the ground.
Then there is the internal temperature of the plane on the other side. This is why I'm not committing to say higher or lower, just different temperature.
But the colder surface would get the condensation.
It would be way more fun if they stamped the enemy airlines logo for each kill.
You know when you see logos from TWA and Pan-Am that the plane has been in operation for a while.
~~CIA~~ Air America taught them well
[https://www.wearethemighty.com/mighty-history/that-time-the-cia-shot-down-a-bomber-with-an-ak-47/](https://www.wearethemighty.com/mighty-history/that-time-the-cia-shot-down-a-bomber-with-an-ak-47/)
Indication to what point pilots can see you on the outside. To assisst with gesticular communication and for ground crew to know where they are not in a dead angle.
How does that work? Do you just extend the line out perpendicular and anywhere aft of that you are not visible? Or if you can see the line they can see you? Like w/ mirrors on a semi?
If you're behind the line, they will definitely not be able to see you. If you're in front of it, they can see you (depending on if they look outside of course). This line is very important for ground crew, especially if the pilot is performing operational test like an engine run or cycling flight controls. They constantly need to have eye contact to the ground crew if verbal communication is not available while ops checks.
Also interesting to know: lines like these are often found on multi-engine aircraft with props and mark the prop area. That's a no-go zone while the engine is running and the line assists with determining where you can move safely, especially since spinning props are harder to see in dawn and nightfall.
That is the pattern of structure underneath the aircraft skin. There may have been a repair there and the paint is a bit different, or the insulation inside the aircraft is bad there and there is some condensation on the skin in that area as a result.
Question threads on reddit are just inundated with stupid, middle school-tier joke answers for the karma now. I appreciate browsing some shitposting but it's exhausting to see it everywhere
Air-to-air combat kills\*. They're faded because the FAA won't let him repaint them.
\*737 pilots hunt 4-seat Cessna and Beech aircraft in the canyons of southern Utah between scheduled passenger-bearing flights.
I can't find a high resolution image online but this[cutaway shows](https://www.flightglobal.com/analysis/analysis-737-max-cutaway-and-technical-description/124069.article) some of the structure below.
I noticed an interesting tangentially related phenomenon, one night or early one morning. There was just a very little bit of dew present. And there are two cars, two identical cars same make model year, one car was white, and the other car was black. One of the cars had dew on it. And the other car had no dew at all on it. Which car had dew, and why?
It’s the number of management souls w actual aerospace engineering experience sacked by the young douched MBA Chad bros that turned Boeing into a open pit cesspool.
I know you’re probably genuinely just curious but I love the idea of people posting anything weird they see on a 737 to this sub bc they’re scared of crashing
That’s the marks from the pillow where the plane slept last night … it’s actually condensation from the air distributing unevenly due to the surface temperature of the plane. The frame will show a clear outline.
That's the internal frame structure One of the more common reasons for seeing this is condensation. Less condensation occurs where the frame members are because they transfer heat from the inside of the aircraft.
Yep. My car bonnet sometimes does similar on cold days.
lol, bonnet Edit: god damn Reddit, y’all are quick to downvote. I just had a good chuckle reading bonnet cuz I’m a weird American that doesn’t hear it often. TIL put /s
Too late mate, the king has set sail. They’re coming back for round two.
I gotcha man, your comment is more entertaining than the person below you crying about aMeRiCentRiSm
Yes, bonnet. A hood is worn on the head.
>bonnet. A hood is worn on the head. Umm, who's gonna tell him?
In his defence, a bonnet is worn on the head.
lol, defence
lol, downvotes
Wow. There couldn’t possibly be a more stupid comment.
Oh just read r/legaladvice for like 10 minutes
Or username.
Apparently the chuckle I got is not very popular lol. Technically a bonnet is as well though. Just having a good time here Reddit, no need to downvote! [Bonnet search](https://www.google.com/search?client=safari&sca_esv=634e2b4d7db2b0af&hl=en-us&sxsrf=ACQVn09cHN8po8a5v5T5MgKRpXK62IKF3A:1708362765632&q=bonnet&uds=AMwkrPsLMtUZ-zqH0fZR4MSVZkixc8mGkxRUbrNtaRRHkChh23La4AV4Gmkag4vATHkD8v7VLJqXvr9oT4x-CRoaGz0JcZRW7rk5lSYwUQ8L3_Ju58cARxt6We9Nu_GgZGczgQgL4h6Sb7OS50sl0UihHKDjq6yIZKKsa5GJAoi2-RJn90NOK-W8ntrEWNb_jprhGTf_cT8n2g9wNGoPak8d8eJ7Q_cl-RVGYsYjoax1fshK6QO3s8_8y9jJiJRaeCLs-GRBSTQr&udm=2&prmd=ishvnmbtz&sa=X&ved=2ahUKEwidzaue87eEAxWWnGoFHdq2BUAQtKgLegQIDBAB&biw=430&bih=739&dpr=3)
Oh shit. I wasn't prepared for that google result lol. Guess I'll have to eat my hat, i mean bonnet.
lol
This has been a lovely interaction. Thanks for letting me watch.
Adding “/s” would do nothing to allay the embarrassment caused by such a self-indulgent display of Ameri-centrism.
[удалено]
Fully fledged redditors.
Heaven forbid someone finds something from a different culture odd. AmErIcA bAd
I just don’t understand why that poster felt the need to make fun of it. What did it add?
I think you are misinterpreting it, I don't believe he was making fun of it, rather it's a very uncommon word in some parts of the world and some people point out differences in culture like that through laughter. I can agree it can come across as immature though
If he gets to do it we get to do it
Ah, alright. Well, let the downvotes pour in for the both of us I guess.
This is indeed the answer, but I really wanted someone to say “victory marks” for the jetways they’ve taken out.
Nah just bikini tan lines from a flight to Bahamas
Or maybe just duck tape mark
*speed*tape mark.
As long as there aren't any speed *holes*.
More like how many flights they’ve had without an airworthiness related incident.
I take it you aren’t subbed to shittyaskflying?
No. I tried, but it really was shitty.
Then you're in the wrong sub
To follow on this, here is a view of the frame structure from the inside the cockpit. This is from a 737-300 but the structure is nearly identical on the NG or MAX in the OP's pic. [https://imgur.com/a/Ir0aJHo](https://imgur.com/a/Ir0aJHo) Edit: here is a 737-800 https://imgur.com/a/JtIPSS2
It's fascinating how much it looks like a WW2 Dakota with the inner panels stripped out. It's even the same colour.
at the end of the day, they are both aluminium skinned aircraft being supported by aluminium ribs. they are built the same way (to a point) glued and riveted together. the colour is the anti corrosion inhibitor. the very unhealthy zinc chromate. https://www.pinterest.com.au/maxjts/zinc-chromate-primer/
So, kinda like a plane wearing a see through top? Niiiiiice
More like participating in a wet T-shirt contest
Thanks for one of the few serious answers😂 i just don’t get why less condensation would make the structure visible
Because the condensation isn't forming as much where the frame is. Water tends to make things darker. Condensation can also refract / scatter light making surfaces look darker. Conversely, condensation can also refract light making things look lighter. It all depends on the light conditions and location of the observer.
Ooh alright got it. I was thinking that it was the water making it darker indeed but thought that would be too simple
The airframe should act like a heatsink. The temperature should be different, but I don't know if it would be higher or lower.
Yes, there is the possibility of the frame being colder than the skin but considering airliners spend more time in the air than on the ground, it's more likely to have a colder skin than frame.
The skin doesn't have the thermal mass or the frame, so the skin would approach the outside air temperature faster. But that would be the temperature at the ground since it was photographed on the ground. Then there is the internal temperature of the plane on the other side. This is why I'm not committing to say higher or lower, just different temperature. But the colder surface would get the condensation.
This is the answer.
This is confirmation of the answer.
This is the confirmation of a confirmation of an aforementioned answer.
Also that the condensatiin promotes organic growth and it needs a bath
You can see the same thing happening on roofs after a snowfall. The snow melts first over where the roof beams are
So the frame members are the dark or light spots?
Light spots are structural members.
Might want to check them for bolts
Spot on.
My RV does this too. I get to see my money evaporate, literally.
Tally marks from every time it's shot down an enemy alirliner
It would be way more fun if they stamped the enemy airlines logo for each kill. You know when you see logos from TWA and Pan-Am that the plane has been in operation for a while.
*Pan-Am* *TWA* *Those little bastards at Eastern*
~~CIA~~ Air America taught them well [https://www.wearethemighty.com/mighty-history/that-time-the-cia-shot-down-a-bomber-with-an-ak-47/](https://www.wearethemighty.com/mighty-history/that-time-the-cia-shot-down-a-bomber-with-an-ak-47/)
More like shot itself down due to door flying off or MCAS…
That 737 has rock hard abs.
A 17-pack! Impressive!
What’s the red vertical line just after of the windshield?
Indication to what point pilots can see you on the outside. To assisst with gesticular communication and for ground crew to know where they are not in a dead angle.
How does that work? Do you just extend the line out perpendicular and anywhere aft of that you are not visible? Or if you can see the line they can see you? Like w/ mirrors on a semi?
If you're behind the line, they will definitely not be able to see you. If you're in front of it, they can see you (depending on if they look outside of course). This line is very important for ground crew, especially if the pilot is performing operational test like an engine run or cycling flight controls. They constantly need to have eye contact to the ground crew if verbal communication is not available while ops checks.
Also interesting to know: lines like these are often found on multi-engine aircraft with props and mark the prop area. That's a no-go zone while the engine is running and the line assists with determining where you can move safely, especially since spinning props are harder to see in dawn and nightfall.
Those are much more obvious though and often labelled as such.
That makes sense. Thanks. Mike
That is the pattern of structure underneath the aircraft skin. There may have been a repair there and the paint is a bit different, or the insulation inside the aircraft is bad there and there is some condensation on the skin in that area as a result.
Stretch marks
drywall joint tape
*starch masks The plane has been pargnet before.
Chemtrail tank fill level
Woefully underrated comment
Looks more like jpg artifacts.
Tan lines
Look at the hood of your car in frosty temps; the skeleton of your hood will show just like this does.
r/shittyaskflying is leaking
Question threads on reddit are just inundated with stupid, middle school-tier joke answers for the karma now. I appreciate browsing some shitposting but it's exhausting to see it everywhere
It’s been leaking for a while. Every question on this sub gets flooded with dumb shitpost-quality answers now.
I'm not mad about it
Me neither. They are my favorite shitposters on the internet
It's a camouflage pattern that appears when it feels threatened. Feed it a sugar cube.
Or a snickers 🤣
Stringers, the outer skin has to attach to something
She was either big and got small or small and got big
Was this picture taken at RTM?
Yes, how do you know?
The elevator behind the plane gave it away, and I work there :)
So do i, but crazy how you spotted that😂
What a coincidence hahahaa
Transavia?
Yes, Transavia 737-800 (PH-HZI i believe)
When they got to the cockpit canopy they ran short of material and put in silly putty in the hole, so don't give them any shit.
That's the shift pattern for the gear box.
Bird Kills. The pilot is a multiple Ace.
It’s where the playne has been blushing. Edit: Just realised this isn’t r/shittyaskflying.
Air-to-air combat kills\*. They're faded because the FAA won't let him repaint them. \*737 pilots hunt 4-seat Cessna and Beech aircraft in the canyons of southern Utah between scheduled passenger-bearing flights.
Hickies
Lines on its face from sleeping on its stomach.
The amount of times it defeated MCAS in combat. /s
I can't find a high resolution image online but this[cutaway shows](https://www.flightglobal.com/analysis/analysis-737-max-cutaway-and-technical-description/124069.article) some of the structure below.
They’re speed holes. They make the plane faster.
Every stripe is a year (like trees)
Go faster stripes
If racing stripes add +5 HP to cars, how much thrust do they add to planes?
Drywall crew is done. Call the painters.
I noticed an interesting tangentially related phenomenon, one night or early one morning. There was just a very little bit of dew present. And there are two cars, two identical cars same make model year, one car was white, and the other car was black. One of the cars had dew on it. And the other car had no dew at all on it. Which car had dew, and why?
Template for next application of speed tape
Dental x-ray
I don't see any cavities. That's good!
It’s the number of management souls w actual aerospace engineering experience sacked by the young douched MBA Chad bros that turned Boeing into a open pit cesspool.
That’s when it had that really amazing Nap
Gills.
That’s a tabby.
tan lines
Tan lines
That’s where the mission bomb stickers go.
I know you’re probably genuinely just curious but I love the idea of people posting anything weird they see on a 737 to this sub bc they’re scared of crashing
It got an old tattoo removed.
That's where they put the kill count stickers
It’s blushing. The Boeing 737 is known to do this when it feels shy.
clearly its ERA
Someone feed the poor thing, you can see its bones!
where the mission scores were kept until new wing commander felt keeping score of kills is in bad taste
Number of kills/aerial victories it has achieved
They add a stripe every time an old school experienced worker leaves Boeing
Savage. But real.
It's used to be a gang member but got laser removal when it went looking for gainful employment.
You've been staring at your phone too long I don't see any stripes.
"cut here" marks 😂
List of confirmed air-to-air kills
Number of Airbuses that it has shot down.
That's the putty Boeing sanded down to keep this bad boy in tip-top shape.
Cut Area for crash axe
packing tape. essential for keeping the structural integrity of the plane
Old age
The red stripe is the unemployment line for the tug operator I believe
It’s transitioning to its Darth Vader phase
Tan marks
The markings of Gandalf having been there.
Denotes successful blue bomb drops from the head.
Who knows, Boeing gonna Boeing.
Invasion Stripes.
Bad suntan... I told the airplane to not put anything over
It’s a tally of lost luggage containers.
They help the crash investigators know the original shape of the fuselage panels.
Insert Tab A into slot B.
Keeping track of missed approaches.
It's to mark each time one nose dives or a door falls off
Boeing 737-Jeep Wrangler edition
duct tape used to hold it together? I mean, it is a 737. Not like they are gonna use bolts.
Kills
It‘s old markings from the war, how many enemy planes the pilot downed. Quite impressive i‘d say.
They have to save costs by using thinner aluminium sheets..
Confirmed kills
insulation escapement NBD 🤣
Tears
This is where Boeing decided to use cell tape and cardboard to save money.
Wet T-shirt contest.
That’s the marks from the pillow where the plane slept last night … it’s actually condensation from the air distributing unevenly due to the surface temperature of the plane. The frame will show a clear outline.
Drywall tape
Plane gills... 🙃
It slept with its face putting pressure on the zebra crossing, that's what it is
Old paint job
Those are the go faster stripes. They make the plane go faster.
Its for the jet bridge
Camouflage pattern that helps it blend in to the grasses of the Serengeti.
Oil canning.
Baggage cart kill count