The official aviation quiz topic!

realplaneshaveprops · Post by **realplaneshaveprops** » 19 Jun 2005, 13:40

Here comes the question:

What is RVSM and what is the purpose of it?

Greetz

Koen

MD-11 · Post by **MD-11** » 19 Jun 2005, 16:55

Reduced Vertical Seperation Minima
To keep safe vertical distance between planes and using the airspace as optimal as possible.
Planes with RVSM equipment may fly "closer" to each other.

realplaneshaveprops · Post by **realplaneshaveprops** » 19 Jun 2005, 17:00

That's correct MD-11!

The goal of RVSM is to reduce the vertical separation above flight level (FL) 290 from the current 2000-ft minimum to 1000-ft minimum. This will allow aircraft to safely fly more optimum profiles, gain fuel savings and increase airspace capacity.

http://www.ecacnav.com/rvsm/default.htm

Next question plz?

Koen

MD-11 · Post by **MD-11** » 19 Jun 2005, 17:16

In case of "distress" ( for example total engine loss or ditching ) the call "Mayday Mayday Mayday" is made followed by "This is flight****"
What word is called out three times as well in case of "urgency" ( example: lost, partial engine failure ), followed by "This is flight ***" ?

realplaneshaveprops · Post by **realplaneshaveprops** » 19 Jun 2005, 17:22

Pan Pan Pan?

Koen

MD-11 · Post by **MD-11** » 19 Jun 2005, 17:39

Correct...

realplaneshaveprops · Post by **realplaneshaveprops** » 19 Jun 2005, 17:46

What's so special about the air in aircraft tires? And why is that?

Koen

HorsePower · Post by **HorsePower** » 19 Jun 2005, 18:23

Nitrogen, because it's an inert gaz.

realplaneshaveprops · Post by **realplaneshaveprops** » 19 Jun 2005, 18:28

Nitrogen is not a inert gas. So that's not the reason for it's use.

Inert gasses in order of increasing atomic number they are: helium , neon , argon , krypton , xenon , and radon.

Try again.

Koen

HorsePower · Post by **HorsePower** » 19 Jun 2005, 18:32

I mean it doesn't explode (no oxygen/hydrogen).

realplaneshaveprops · Post by **realplaneshaveprops** » 19 Jun 2005, 18:37

There is a more important reason!

But it's also true that it cannot explode and that their are no chemical reactions at high temperatures because their is no oxygen in the tire.

Koen

HorsePower · Post by **HorsePower** » 19 Jun 2005, 18:51

??
Are you talking about oxydation?

MD-11 · Post by **MD-11** » 19 Jun 2005, 18:59

The air cannot escape the tyre, so the pressure doesn't drop.

realplaneshaveprops · Post by **realplaneshaveprops** » 19 Jun 2005, 19:06

If you hit the brakes hard on landing, the brakes will be very hot. The temperature in the tyres will rise. If there is enough oxygen in the tyre, it could react with the rubber, it could damage the tyre.

I'm just waiting for the main reason why it's not just normal air!

Koen

HorsePower · Post by **HorsePower** » 19 Jun 2005, 19:10

MD-11 wrote:The air cannot escape the tyre, so the pressure doesn't drop.

Yeah, I've heard that Nitrogen atomium is a little bit bigger than standard air. Personally, I think it is BS knowing that air is 81% constitued with Nitrogen.

On a side note, have you heard already about inerted tanks (see TWA 800 official inquisity)?

Regards

Seb.

EDIT: Oops

realplaneshaveprops · Post by **realplaneshaveprops** » 19 Jun 2005, 19:16

I didn't say that, it comes from MD-11.

And yes, I've heard of inerted fueltanks, it's not used in civil aviation I think, only military.

Do you want a extra hint or the correct answer?

Koen

HorsePower · Post by **HorsePower** » 19 Jun 2005, 19:22

realplaneshaveprops wrote:And yes, I've heard of inerted fueltanks, it's not used in civil aviation I think, only military.

Now, it will be used on civilian aircrafts ($$). I'm not sure but I think all new airplane (A380 + B787) will be fitted with.

realplaneshaveprops wrote:Do you want a extra hint or the correct answer?

I give up, but wait for other members (1 or 2 days) before release the answer.

Regards

Seb.

MD-11 · Post by **MD-11** » 19 Jun 2005, 21:24

The air cannot burn

realplaneshaveprops · Post by **realplaneshaveprops** » 21 Jun 2005, 18:07

The other reason I was looking for was that the air needs to be DRY, this is to prevent condensation (and freezing of it) in the aircraft tyre.

So they use Nitrogen because it contains no humid and won't react chemical (like Oxygen).

Koen

realplaneshaveprops · Post by **realplaneshaveprops** » 21 Jun 2005, 18:10

HorsePower,

You gave the best answer, so it's next question comes from you!

Koen