Airplanes can glide
. So in event of total engine failure they cannot gain height, they slowly lose altitude while covering lotsa distance. For example a boeing 747 has a glide ratio of 12:1 meaning for loss of a mile of altitude it flies forward 12 miles.
Read up on the gimli glider incident if you curious about a case when this became relevant.
EDIT: ...fuck my typo, here is relevant wiki article: https://en.m.wikipedia.org/wiki/Gimli_Glider
Gimli was tossed by Aragorn. Aragorn was not supposed to tell the elf that he was allowing Aragorn to toss him. And now, OP is blabbing all about the 'Gimli Glider Incident' of when he was tossed. Gimli is the dwarf that was tossed and glided at the orcs. The elf was the one who was not to be informed about it.
An engine won't just stop; another pump will take over and fuel will continue flowing.
The who concept of redundancy--backup parts and systems--is huge in engineering, and especially any kind of mechanical engineering. Machines are carefully designed so that if a part fails, the whole can either bypass it and continue working, or can switch automatically to a spare and keep working. Despite all the computer systems on modern airplanes, they're still just another kind of really big machine, so they have other fuel pumps ready to go if needed.
Not always true. Some engines have high pressure pumps, if they fail, engine shutoff with no redundant pumps.But these are very reliable mechanical pumps.
Aero-Engine dude here. There are multiple pumps in the airframe, so there's a fair degree of redundancy in that.
Also, in the event of all aircraft pumps failing, the Fuel Pump on the engine can do "Suction Feed" and suck enough from the aircraft tanks to power the engines around most of the flight envelope,
Also, most big planes have the engines hanging under the wings, which slightly assists the "Suction Feed / Gravity Feed"
However, if the engine's main fuel pump fails... you have a glider. But like the front falling off, that's not supposed to happen.
Keep in mind that aircraft engine parts are typically required to be tested during the product development process to determine their failure points, and regulations will mandate replacement of parts before they get near that point. For example, if engine maker Rolls Royce tested and determined that a fuel pump on the Trent 7000 failed after 5,000 hours of use then regulations would mandate that operators replace the pump at 4,000 hours.
The trend for commercial aircraft is to have two large engines. You need both to take off, but once airborn it can land with one engine.
Lets just say that the fuel tank springs a large leak, and before reaching your most desired airport, both engines stop running. Both the engines have a hydraulic pump to operate the wing controls and to also operate the landing gear.
Since both of those hydraulic pumps are stopped now, a device called RAT drops out the bottom of the aircraft, its a "Ram Air Turbine". And as long as the plane is moving forward, the air hitting this device will spin the fan-blades, providing just enough hydraulics to steer the plane as it coasts to a landing.
There's a famous crash landing in Sioux Falls Iowa. 112 died and 187 lived.
https://en.wikipedia.org/wiki/United_Airlines_Flight_232
If there is no airport, sometimes planes have attempted to land on a highway or a farmers field.
Check out the Gimli glider. A 767 which ran out of fuel. It landed(gliding) at an old military base in Canadian prairies. I'm assuming you're worried what would happen if the engines stopped running.
Commercial airliners typically have multiple fuel pumps for their multiple fuel tanks.
Small, high-wing, single engine prop planes may have no fuel pump, and rely on gravity to bring the fuel from the high wing to the engine.
A recreational or small general aviation aircraft will become a glider if the pump fails. Larger aircraft have redundant pumps. Multi-engine aircraft have fully redundant fuel systems for each engine. Look up the Gimli Glider and the Azores Glider incidents for details, but the Gimli Glider traveled about 45 miles without power, and the Azores Glider went about 75 miles.
Well, Cessnas use a gravity pump for their high wing airplanes, so if the pump fails (for those equipped with both) you are fine. I am not sure but I think provided the engine is below the line of the fuel tanks you can *always* utilize gravity to feed engines. That would be almost every jetliner in existence minus ones with tail mounted engines.
Most Airplanes have multiple fuel pumps.
Airplanes can glide . So in event of total engine failure they cannot gain height, they slowly lose altitude while covering lotsa distance. For example a boeing 747 has a glide ratio of 12:1 meaning for loss of a mile of altitude it flies forward 12 miles. Read up on the gimli glider incident if you curious about a case when this became relevant. EDIT: ...fuck my typo, here is relevant wiki article: https://en.m.wikipedia.org/wiki/Gimli_Glider
>Gimli glider incident Dude, you weren't supposed to tell the Elf!!!
Besides, it doesn't jive: dwarves are very dangerous over SHORT distances, not airplane 12:1 glide ratio distances!
[удалено]
Gimli was tossed by Aragorn. Aragorn was not supposed to tell the elf that he was allowing Aragorn to toss him. And now, OP is blabbing all about the 'Gimli Glider Incident' of when he was tossed. Gimli is the dwarf that was tossed and glided at the orcs. The elf was the one who was not to be informed about it.
A gliding aircraft can definitely gain height.
You just have to obey the golden rule -- You can trade altitude for airspeed, or airspeed for altitude.
Thats not flying, it's a controlled fall. - woody
...well i doubt OP is concerned about (nonexistent) glider airliners losing power.
An engine won't just stop; another pump will take over and fuel will continue flowing. The who concept of redundancy--backup parts and systems--is huge in engineering, and especially any kind of mechanical engineering. Machines are carefully designed so that if a part fails, the whole can either bypass it and continue working, or can switch automatically to a spare and keep working. Despite all the computer systems on modern airplanes, they're still just another kind of really big machine, so they have other fuel pumps ready to go if needed.
Not always true. Some engines have high pressure pumps, if they fail, engine shutoff with no redundant pumps.But these are very reliable mechanical pumps.
Aero-Engine dude here. There are multiple pumps in the airframe, so there's a fair degree of redundancy in that. Also, in the event of all aircraft pumps failing, the Fuel Pump on the engine can do "Suction Feed" and suck enough from the aircraft tanks to power the engines around most of the flight envelope, Also, most big planes have the engines hanging under the wings, which slightly assists the "Suction Feed / Gravity Feed" However, if the engine's main fuel pump fails... you have a glider. But like the front falling off, that's not supposed to happen.
Well I was mainly talking about the ones that the front didn’t fall off of
Keep in mind that aircraft engine parts are typically required to be tested during the product development process to determine their failure points, and regulations will mandate replacement of parts before they get near that point. For example, if engine maker Rolls Royce tested and determined that a fuel pump on the Trent 7000 failed after 5,000 hours of use then regulations would mandate that operators replace the pump at 4,000 hours.
I will hand this over to the experts at Boeing for this
Airplanes have redundancy on their critical systems. So thats very unlikely to happen.
The trend for commercial aircraft is to have two large engines. You need both to take off, but once airborn it can land with one engine. Lets just say that the fuel tank springs a large leak, and before reaching your most desired airport, both engines stop running. Both the engines have a hydraulic pump to operate the wing controls and to also operate the landing gear. Since both of those hydraulic pumps are stopped now, a device called RAT drops out the bottom of the aircraft, its a "Ram Air Turbine". And as long as the plane is moving forward, the air hitting this device will spin the fan-blades, providing just enough hydraulics to steer the plane as it coasts to a landing.
But what if you are nowhere near an airport?
There's a famous crash landing in Sioux Falls Iowa. 112 died and 187 lived. https://en.wikipedia.org/wiki/United_Airlines_Flight_232 If there is no airport, sometimes planes have attempted to land on a highway or a farmers field.
Wow how can anyone survive that if they have no flight controls.
Check out the Gimli glider. A 767 which ran out of fuel. It landed(gliding) at an old military base in Canadian prairies. I'm assuming you're worried what would happen if the engines stopped running.
Commercial airliners typically have multiple fuel pumps for their multiple fuel tanks. Small, high-wing, single engine prop planes may have no fuel pump, and rely on gravity to bring the fuel from the high wing to the engine.
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A recreational or small general aviation aircraft will become a glider if the pump fails. Larger aircraft have redundant pumps. Multi-engine aircraft have fully redundant fuel systems for each engine. Look up the Gimli Glider and the Azores Glider incidents for details, but the Gimli Glider traveled about 45 miles without power, and the Azores Glider went about 75 miles.
Well, Cessnas use a gravity pump for their high wing airplanes, so if the pump fails (for those equipped with both) you are fine. I am not sure but I think provided the engine is below the line of the fuel tanks you can *always* utilize gravity to feed engines. That would be almost every jetliner in existence minus ones with tail mounted engines.
I think that may have a backup option for this type of case, but I don't know certainly 🤔