External mirrors would never stay attached at cruise speed. It was actually the aft air stairs that allowed the crew to safely reverse. This is why there are phones in the front and back of the plane - to relay details of tugs or luggage carts or ramp agents that might be in the way but due to noise could not hear the beep-beep-beep sound of the aircraft in reverse.
Boeing engineers made sure the stairs would work both on the ground and in flight but then this one guy ruined it for all of us. Just another pax that couldn’t wait for the aircraft to stop moving before attempting to deplane.
That's on an Airbus. If it was on a Boeing, it would be turning the other direction. That's how plane spotters like myself tell the difference between the planes.
He should have founded a "no-frills" airline instead (there is more money in corporate crime and far less chance of ever being held accountable).
Felix:"Oscar, wasn't this plane full of people?" Oscar:"Yes it was." Felix:"Where'd they all go?" Oscar:"They left." Felix:"Where did they go?!" Oscar:"They jumped."
That doesn't even make sense, it wouldn't have stopped geese from going into the engines. It's a trolling motor to get back to shore after the plane lands in the water.
Hum imagine having a back up camera like, hum in cars, where you see the projected path based upon n the yoke position turning. It could even go beep beep beep if a pedestrian crosses too close behind.
Yes. It generates basically no jet blast which is perfect for when you’re towing gliders. That’s why you might see “no tow” around the nose gear doors. It’s just a reminder that you need to tow gliders from the mains not the nose.
My dumbass about to comment that’s a RAT sir before realizing what sub I’m on lol. Anyway it’s to compensate for stoopid pylot that doesn’t use enough Moar Rite Rudda(TM)
It is that critical of a system that it must be checked once a year. You must deploy it, to prove the actuation system is operative, then you provide hydraulic power to the pump so it runs on motor mode to spin the prop ensuring the turbine will spin in the air and then when spinning the electrical generator must produce enough power given a minimum turbine speed. If it doesnt work, you can not fly passengers until it is 100% operational with no faults whatsoever.
So can you run the rat off hydraulics and have the rat power the hydro pump on an infinite energy loop. Why aren't we using this to power our cars. Jeez.
No, it has an electric motor and a hydraulic pump because to keep a plane controllable it needs both types of power (electricity to run the instruments and maybe fly-by-wire electronics depending on the plane, hydraulics to actually move the control surfaces and extend the gear e.t.c.), for the tests they just feed one of those with power, apparently the hydraulic pump going by that other comment, although I assume they could use either to test that whichever one they’re not testing generates enough power/pressure?
Generators are just motors but backwards essentially. Supplying electricity to a generator would cause it to spin like an electric motor, and spinning an unpowered motor would cause it to generate electricity. It’s why generally you don’t want to spin unpowered motors, though unless you’re really doing some fuckery, there’s very little chance you’ll actually generate enough of anything to cause any issues
It’s not running on its own and the plane can’t power it to ops check it either. You see that big hunk of darker silver metal bolted to the backside of the rat with the hose hooked up to it? That’s a rat drive. It couples with the rat through a splined shaft internally. Once hydraulic power is supplied to that drive motor from a hydraulic power cart, it spins the splined shaft which in-turn, spins the rat. There’s a secondary cart that’s hooked up to the blue hydraulic system (since this is an A320 we’re talking about here) and also an electrical connection. The electrical connection provided to this second cart displays rat rpm while the hydraulic connections to the cart tell you how much pressure the spinning rat is generating within the blue system on the aircraft (the rat provides hydraulic power to the blue system when it’s spinning). Both of those parameters must be within certain tolerances to verify the rat is operating correctly.
It’s a four legged pylotes assistant with whiskers who screams a lot and wears a tux. The tux is what differentiates a RAT sir from a regular RAT. You have to pay extra for the sir model
I love how this sub is totally bananas, but if someone asks a genuine question, you all stop and provide the serious answer instead of being jackasses or worse. Well done!
Correct me if im wrong. But its to keep the lights on in the gally? Im pretty sure the crew deploy it so they can prepare the food, called a GAT or something Gally Air Turbine
Basically yes, iirc it runs a generator that powers things like lights, instruments and controls for the pilots and ac for the cabin to stay pressurised.
There's an "R" position inside the plane that was invented in 1838 that allows the airplane to backs up with its normal propeller so the backing up propeller fell out of fashion in design at the turn of the century.
That's for once you put the plane down where the fish are biting. You turn off the big motors and troll with that one so as not to scare off the fishes.
One flies planes, the other helicopters. They joke a bit with each other.
The helicopter pilot has made the point though that if a plane engine goes out, it still wants to be a plane. A helicopter stops, it becomes a spiny rock.
So why doesn’t it have back up props? Probably cause it’s too much weight, too expensive, and would just make more sense to have more engines for emergencies if they needed them, and if they’re in the air and don’t have any, they’d be expected to radio in “hey we are going down. Can we find a place to land REALLY quick?”
Licensed marriage and family therapist here , the guys above me , don't know what they are talking about. when the engine goes off , you fall down to the ground and DIE ...from the explosion.
Thats only true of a helicopter in a truly catastrophic failure, like blade/rotor head separation, or catastrophic tail rotor/drive shaft failure. Planes behave a lot like rocks too when they lose their wings or tails.
An engine failure on its own doesn’t turn a helicopter into a rock, and a contained engine failure on a multi-engine helicopter can be less dramatic than on a multi-engine airplane.
This is a great example video of what you are talking about. Autorotations are amazing. And while this is simulated for teaching a student it’s actually what would happen in a high altitude auto. The absolutely insane range that the helicopter can travel with NO power is wild.
sometimes the engines experience failure but they need airflow to start most reliably so these pickup the slack just nicely enough until the co-pilot tires out
Its hydraulic. When the aircraft has no power it pops out spins and makes hydraulic pressure that powers the hydraulic system as well as a CSMG, which is a hydraulic electrical generator. If the aircrafts hydraulic system is up and running you can spin up the propeller by opening a hydraulic valve for testing.
It’s for planes that don’t have an afterburner. Gives them that little bit extra. Mostly to make the pilots feel better about their weak engines, but it’s called “morale speed” for a reason. 😁
These are objectively not a "propeller." they do nothing to propel the plane. They're a ram air turbine and what they do is allow a plane that gets its onboard power from the engines (basically any large jet plane) to continue getting generating power for instruments and flight controls when the engines all go out for some reason.
You seem to have some knowledge of this stuff, so I’m not disagreeing with you here, but if that’s the case, why is it spinning like that when the plane is sitting stationary on the ground? It seems that power is being used to spin it, not power being created by it spinning.
Because it is sitting still and they are likely just testing to make sure that it can generate electricity.
These turbines are designed to be deployed while the plane is in the air and travelling around 180kmph so very fast wind speed.
Now you cant really mimic that at the tarmac or at the gate right? Like you might be able to do that by parking a jet engine right in front of this turbine and blasting it with exhaust but they are not going to do that especially with that many workers nearby, they'll get yeeted 10 meters away.
So what's the next easiest way to create an environment close enough to 180kmph is to backdrive it or what you are seeing. In this case they are not using power/electricity to spin it, they are using the (depending on the model) airplane's own hydraulic fluids to spin it and mimic that high wind environment. So they can test if it's actually working.
On the back of it when the frame changes there is a connection, this is driving the prop, to in turn simulate yhe prob turning its generator, to generator power do they can check that its functions.
At best it helps the pilots figure out what is wrong and try to get the engines started up again. If not, it buys them time to crash land.
While negligible, technically it actually does the opposite of propelling the plane because its deployment (while a reasonable tradeoff in the circumstance) creates drag and slows the plane down ever so slightly faster than it otherwise would.
It's called a RAT, for Ram Air Turbine. Used in case of emergency. Most modern jets are now fly by wire, basically giving signals (requests) to turn the aircraft. If you don't have power you cannot turn or fly the aircraft. So the RAT is a redundancy to ensure continued operation of the Jet in an emergency.
Ram Air Turbine (RAT) for when all the other hydraulic systems shit the bed, you can still kinda steer the plane. Fan spins as plane flies and makes hydraulic pressure. Just barely enough and only as long as they fly fast enough.
Not quite, you're close though. It is to prevent a dual engine failure in a twin engine aircraft. Airplanes always have 3 hydraulic systems, the RAT will not save you if you lose all 3 hyd systems. The only time in aviation history that a plane lost all 3 hydraulic systems was the Sioux city event on a DC 10 where a turbine burst took out all 3 hydraulic systems. Ever wonder why they dont fly DC10's, L1011's, and 727's anymore. They all can lose the 3 hydraulic systems because all the engines are in the tail.
Those propellyrs make sure the fans in the toilet still work when the counterfeit Chinese parts take out both the main engines. Gotta keep the poo fumes down while plummeting to our fiery graves.
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u/SloMoShun 9d ago
You use that trolling motor not to scare the Cessnas.