What is this door?

[@s0nnyburnett]

Yo dawg we heard you forgot to close the door so we added 2 little doors to let you know you didn't close the door.

[@NextGenerationMechanic]

🤣🤣

[@thedownwardmachine]

Yo dawg…

[@SgfGustafsson]

My guess is that aside from a visual indicator that the plug door isn’t closed/latched, the flag doors are probably also supposed to act like blowout panels to prevent structural failure due to pressurization with the EE door open. Especially since I’m sure there are proximity sensors that would alert the cockpit if the EE door wasn’t closed and latched anyways.

[@NextGenerationMechanic]

That's right as well!

[@benargee]

Yes because they could have had a different visual indicator that didn't open a hole at all.

[@stephanemonfette106]

Probably also to create an opening large enough to avoid being able to pressurize the plane and take off in this config.

[@SgfGustafsson]

@stephanemonfette106 You're kinda rewording what I already said. They would prevent structural failure by not letting that outer door ever act as part of the pressure vessel.

[@stephanemonfette106]

@SgfGustafsson well not exactly, structural failure is one things I agree but dispatching with an unsafe conditions from a pressurisation standpoint can lead to unsafe higher than expected cabin altitude, crew warnings msg, oxygen masks dropping in the cabin. Also a burden from an operation point of view to reset all this equipment. Looks like in the video there is gaps between the pressure shell and fairing where air could potentially vent but I'm not sure about that.

[@CHOXON2CHOXOFF]

Simple mechanisms but yet so critical. Amazing.

[@Hopeless_and_Forlorn]

Nice arrangement, and a sad commentary on the fact that earlier models of airliners have sometimes been forced to return to the gate during taxi out because the flight crew finally noticed the DOORS annunciator and master caution telling them that a door was open. Just as with engine cowl latches, if something is located on the bottom of the aircraft, nobody wants to bend a knee to check it on walk around.

[@broderp]

Who would have guessed. I would have put a light in the cockpit or a strobing super bright light instead of the complex baby doors....

[@Workerbee-zy5nx]

Did you shade tree mechanics get that?

[@christopherkim8796]

Very appreciate your B787 information. Very useful!!!

[@NextGenerationMechanic]

Thank you!

[@andrewsmactips]

Don't forget that last latch. ;)

[@NextGenerationMechanic]

I won't 😁

[@patrickradcliffe3837]

Geez a beer can would have been simplerer then that Rube Goldberg device.

[@michaelguerin56]

Thank you. Simple visible mechanical indicators that ‘stick out like dogs’ balls’ are always a better option for situations like that.

[@gwenyfred1743]

You missed the two RED ONES

[@vieiraft]

In a 747 there is a door like this below the flight deck. Steven Seagall's team used this door to board a hijacked plane.

[@kg-Whatthehelliseventhat]

Mother in law eject door? 😂 I am joking. 😂

[@buddyboy4x44]

Great title. Is this on a car? What model?

[@VictoryAviation]

Extremely cool! Thanks for making this video!!

[@nicholasarms]

Can you explain the use of this pressurize extra-door in the bottom of the plane? Obviously it is not used on a regular basis but for security or otherwise... I'm curious to know.

[@NextGenerationMechanic]

The pressurized door is to seal the cabin "airtight" to keep the cabin pressure on levels where humans can stay comfortably. The flappers on the door are there as a fail-safe/visual indication of the pressurized door is closed and locked properly.

[@nicholasarms]

Yes but that does'nt explain the pressurized door is used for. Is it used as an escape door in case of emergency ?@@NextGenerationMechanic

[@haywoodyoudome]

@@nicholasarms He doesn't understand basic English....pretty scary that he's allowed that close to commercial aircraft.

[@NextGenerationMechanic]

It's the entry of the electronic equipment bay.

[@NextGenerationMechanic]

Correct!

[@cmoorhead1]

The door inside the door, in front of the door to ensure the inner door is closed. Seems it would be easier to have a mechanism that interferes with the outer door closing when the pressure hatch is open.

[@Kalvinjj]

I would agree to that, but then it could be forced into place. I imagine those things ain't closing like a nice new car's door even when brand new, let alone after quite a few cycles and weather. Forcing doors closed has led to cargo doors being blown off (with the associated fuselage damage) from early 747s, and I could be wrong but I think the DC-10 as well.

[@brantkobe122]

Clould you give me how to reset the flag door demonstration by manually

[@luigid.spatola6141]

Great content buddy!

[@NextGenerationMechanic]

Thank you!!

[@bostonrailfan2427]

…by the look of the thumbnail i thought this was a new fighter/bomber so thought it was a bomb bay! it’s a great use of space that is empty anyway while ensuring safety

[@noelht1]

That’s the door that Schwarzenegger uses to jump off the plane as it’s taking off. He won’t fly on a plane unless it’s got one of these doors!

[@cck1496]

Good video. What is aft EE bay? Is it aft avionics bay? Thanks.

[@NextGenerationMechanic]

Yes sir!

[@rael5469]

The aft E&E compartment houses all of the large, liquid cooled, starter motor controllers. The ones that run the electric air compressors for cabin pressurization and the ones that supply starting power for the VFSG motors. VFSG stands for variable frequency starter/generators. The main powerplants on the 787 are started electrically. The starters are also the main aircraft generators. Two on each engine. Once the engine is started the starter becomes the electrical generator.

[@juliogonzo2718]

Ahh that's where the bricks of cocaine go

[@genericuser9653]

Ingenious.

[@bendtfender2894]

Awesome videos! Subbed.

[@NextGenerationMechanic]

Thank you very much!

[@InvertedMike]

More insight I never knew about. 👍

[@maheralazzawi7814]

very good

[@WhiskeyGulf71]

What’s this door for anyway ?

[@rael5469]

Unfortunately they don't always pop open when they should. They get stuck closed and that defeats their purpose.

[@therighthonourabletimothy5448]

Yes, that's all fine and dandy, but why is the door there in the first place?

[@gazratjackson]

Gud point, must be secret 😳🤷‍♂️

[@rael5469]

The little flapper doors tell you when the inner pressurized door is not closed. The inner door must be closed for takeoff. The inner door is the access to the aft E&E compartment where various electrical components and computers reside. E&E stands for Electrical and Environmental (aircraft system) because the cabin pressure controllers also reside in the E&E compartment.

[@TheNefastor]

Why does this seem like a low-effort workaround for an engineering oversight ?

[@obsidianjane4413]

As opposed to what? The lowest effort would be to not allow the cover to latch with the hatch unsealed. This is actually a pretty high effort to maximize the part count for a simple telltale.

[@uzaiyaro]

Do pilots have any indication that these flag doors are open, or is it just a case that the plane won’t pressurise?

[@NextGenerationMechanic]

There is a door indication if the pressurized door isn't closed.

[@dannyvdmoo]

@@NextGenerationMechanic pilot always visual check airplane outside, before entering cockpit logic!

[@anbooba]

@@dannyvdmoo I worked as a ground crew, Pilots walk around usually is done very early , usually when the pilots arrive at the aircraft, and check general condition, like tires, no visible dents etc., but latches, and there are quite a few of them, are the responsibility of the ground crew leader, who have to do a final walk around to make sure all latches, cargo, and fuel doors are locked.

[@rael5469]

To answer your question, there is no warning light in the flight deck that these doors are open. But there is an indication if the inner pressurized door is open. And on the design side, if I'm not mistaken you can't close the larger panel if these flapper doors are open and the inner door is closed.....they would touch the inner door and hold the larger access panel open so you couldn't latch it. In other words, the inner door has to be closed and the flapper doors have to be flush in order to close the larger access panel. It's pretty ingenious.

[@JIUNnF]

При открытии они могли бы дополнително опускатся на шарнирах ещё ниже либо иметь дополнителную площадь.

[@ovalwingnut]

I trust this wasn't implemented due to a previous inflight issue? :O( Thank you for the video. Cheers from So.CA.USA 3rd house on the left.

[@6YJI9]

Well, I sure was definitely wrong with my guess lol. My guess was that it was for the exhaust for the APU like (I believe) on the B777. I learned the hard way one day when I decided to walk right underneath the APU exhaust vent just for funsies which looked very similar to what's shown in this video.

[@N9197U]

The 777 APU exhaust is high on the tail, you must have walked under the avionics cooling outflow.

[@FRITZI999]

Interesting!

[@mickeyflynn5427]

Seems like an example of over engineering unless there is some practical reason why the outer door should be allowed to close while leaving the inner plug door open.

[@cracnain]

Clever !

[@Alejka07]

Cool

[@pauldavis9387]

And I’m sure there is an indicator on the flight deck that a door is open.

[@NextGenerationMechanic]

Yes sir. There is an indication on the door synoptics page. This is just a quick way to see for the ground crew that not everything is properly closed and locked.

[@brantkobe122]

So how to reset the baffle flush?

[@rael5469]

You have to hold them closed while closing the larger panel. The larger panel must be flush in the opening and then close a nearby latch and they will stay closed. Unfortunately these doors get stuck closed and don't always pop open when they should. However, as others have said the door into the fuselage is monitored and the pilots would get a warning in the flight deck if it was open. Plus they would find it impossible to pressurize the aircraft if the inner door was open at takeoff.

[@guyfrompoland1358]

do not spread this around!!!! they're gonna make Tom Cruise get on the plane by this door in next movie xD

[@NextGenerationMechanic]

🤣

[@Cakey831]

It’s always chemtrails. Always.

[@richardburns-uz7of]

I thought was for all the piss and crap from the toilet to go out

[@Danin4985]

That’s where the super ultra low fare paying pax go.

[@FranktheDachshund]

Nifty

[@billfold1837]

Where they drop the poop

[@rearspeaker6364]

in the park at the end of the runway!

[@singleproppilot]

Silly and overengineered. Why didn’t they just make the E/E door close flush with the outside instead of having a door to get to the door?

[@admiralbeez8143]

I thought it was the poop chute.

[@trivialinsignific]

thats where the toilet dumps out in flight - (da)

[@justin8894]

Can you get into that room during flight?

[@Thunderbyrd.]

Why didn't he wipe his greasy finger prints off of the panel?

[@MarcelPlays]

because planes get dirty anyways?

[@The1stDukeDroklar]

If you wq\atched Made in America you already KNOW what that door is for lol.

[@UQRXD]

The drugs are hidden in that space.

[@sindobrandnew]

Nice failsafe.

[@pidginmac]

No. That is the door to Satan’s outhouse. Do not misinform me

[@scottm5425]

cleaver

[@kd7alt]

Mechanical, no need for power.

[@jameskirk2579]

Is it safe for passengers to upload such video on KZbin ???????

[@MonkPetite]

This is pile of mechanical nonsense to make the jet more heavy. 😂 But the red panels are called Flag doors. As it states on the pannel it self. Above that there is a Hatch. It’s not a door but hatch. Now personally I wonder what idiot did design this ridiculous complex system. How easy would it be to make the whole panel red and so that your not able to close it until the hatch is secure. 😊

[@KR72534]

Xxxx

[@fanelli57]

I guess keeping information about access to aircraft compartments and the like is no longer considered a security issue, lets just reveal everything to the world.

[@williamhaynes7089]

Pretty sure this door is no big secret, and that workers/mechanics dont need to sign a Non disclosre agreement about it.

[@rael5469]

Everyone on the airport parking ramp has had a security background check.

[@fanelli57]

@@rael5469 And yet I was there to see a company swarming with secret service people investigating the theft of a military weapon from a military charter flight by a ramp worker.

[@rael5469]

@@fanelli57 No system is perfect. There have been traitors even within our own military itself.

[@fanelli57]

@@rael5469 Which is exactly why you don't publish information the public has no need to know.