how much time to do planes stay on the ground?

[SexyGreyFox]

iirc there are not enough spaces at all the civilian airports in the world for all the planes to land at once

I've heard this many years ago but America somehow grounded all their planes after 9/11.

 

[shadow_boxer]

30-45 minutes is daily standard for short haul flights iirc.

 

[Scuzi]

I guess this is a cause of some delays.

Yup. Unprofessional Controllers do cause unnecessary delays on a regular basis!

 

[poker_999]

ok apparently these planes carry so much fuel if they need to land in an emergency the often have to dump the fuel or they are to heavy to land.

Where do they dump it? over the sea? What about environmental risks etc? If they dump fuel why dont they dump faecal matter as well?

How much fuel is wasted by dumping? (monetary and litre figures please)

 

[Scuzi]

ok apparently these planes carry so much fuel if they need to land in an emergency the often have to dump the fuel or they are to heavy to land.

Where do they dump it? over the sea? What about environmental risks etc? If they dump fuel why dont they dump faecal matter as well?

How much fuel is wasted by dumping? (monetary and litre figures please)

Dumping can occur anywhere. Recommendations are for dumping to be carried about above FL100 in winter and above FL70 in summer, preferably over unpopulated areas. The fuel evaporates into the atmosphere before reaching the surface. The environmental risks are minimal and fuel dumping happens very rarely. Dumping may take place below these recommended levels and in less than suitable areas in the event of an emergency.

I'm not sure of actual figures but I've worked aircraft which have dumped fifty tonnes and more.

Not all aircraft are able to or need to dump fuel.

 

[poker_999]

what is fl100

and fl70?

Flight level?

 

[Scuzi]

Sorry, yes. Flight Level 100 is 10,000ft, FL70 = 7,000ft.

 

[Kenai]

I guess this is a cause of some delays.

What on earth is going on there lol

 

[RomanNose]

Time of existence- time flying.

 

[Deleted member 66701]

ok apparently these planes carry so much fuel if they need to land in an emergency the often have to dump the fuel or they are to heavy to land.

Actually, most modern aircraft have maximum landing weights the same as the maximum take off weights and those that don't still don't necessarily have systems to dump fuel - it's assumed that by the time a plane has taken off it's burnt up enough fuel to be able to land again.

Fuel dumping actually on occurs about 127 times per year.

Where do they dump it? over the sea?

Over the sea if it's low level or over land if the plane is high enough that the fuel will dissipate easily.

What about environmental risks etc?

Assume an average fuel dump of 12000 gallons 127 times per year =
About 1.5million gallons.

 

[poker_999]

Actually, most modern aircraft have maximum landing weights the same as the maximum take off weights and those that don't still don't necessarily have systems to dump fuel - it's assumed that by the time a plane has taken off it's burnt up enough fuel to be able to land again.

Yeah but most planes arnt modern are they? Plenty of airlines are still flying around in almost 40 year old rust buckets.

 

[Tefal]

I've heard this many years ago but America somehow grounded all their planes after 9/11.

because Americas planes aren't all the planes in the world.

 

[poker_999]

because Americas planes aren't all the planes in the world.

owned

 

[Deleted member 66701]

Yeah but most planes arnt modern are they? Plenty of airlines are still flying around in almost 40 year old rust buckets.

Due to the time between concept, design, testing and service - anything 30 years or younger is considered modern

 

[Deleted member 66701]

because Americas planes aren't all the planes in the world.

And a lot (something like 25%) were abroad at the time

 

[SexyGreyFox]

because Americas planes aren't all the planes in the world.

I think you missed the point.
America own a lot of planes (probably way more than anybody else) but were able to ground them all.
Somebody stated earlier that it couldn't be done irrespective if it's one country or all of them.
It is a myth that you can't get all planes down on the ground.

 

[Scuzi]

I think you missed the point.
America own a lot of planes (probably way more than anybody else) but were able to ground them all.
Somebody stated earlier that it couldn't be done irrespective if it's one country or all of them.
It is a myth that you can't get all planes down on the ground.

I reckon there's enough tarmac out there to get all aircraft on the ground.

 

[neodude]

I reckon there's enough tarmac out there to get all aircraft on the ground.

I concur

 

[Werewolf]

I'd be amazed if there wasn't space for all the aircraft to be put down - most airports don't run at 100% capacity, and if needed you could park them closer together than normal/park them in areas that wouldn't normally be used for parking (IE by the terminals), or even where the airport has multiple runways, on one of them as a last resort.

It would probably be a major exercise to get them back to where they are meant to be (it often is when just a few airports are out of action), and almost certainly cost a fortune in lost time but it would be doable imo.

 

[SexyGreyFox]

I concur

Might bugger up the traffic on the M6 though.