Airbus ventilation/tanks/rnav/qnh
 

Hi everyone,
I had these questions:

Wikipedia: "A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravitypumps."

1) How does the pump work? With fuel? But what is the use? Is it to move the fuel?
Could you just have a photo of it while moving something?

2) There were pipes, to bypass the pump stuff, but the pipes shouldn't have valves, so basically the fuel can also go inside even if there are no pump failures, or is there something else so that it doesn't go inside it at any time?

3) What is the horizontal and vertical guidance for an RNAV approach, for example the glideslope or the LOC for an ILS approach?

4) How does a plane knows where to go? With GPS?

5) When a VOR has been captured, does it still use GPS?

When the plane is ditching the packs closes.

6) Does all the ventilation system closes?

7) Do the outflow exits close?

8) Do the outflow valves close?

9) If the plane is ditching, you still need air below 12500 ft. But the packs are not working while ditching. So will the "last air" that was there will remain to maintain that pressure at least till we level off or stop ditching?

10) Are the A330 QNH autopilot change altitude when we pass the QNH from standard to the real QNH?If not, why?

11) When are QNH is 1018, our airport altitude is below sea level, isn't it?

Thanks a lot,

Kind regards,
AF330

Pumps don't move the fuel as much as they attract the fuel. Like a magnet, the pumps can attract of repel fuel. When in 'ionic mode A" the chemical ionic bonds are bias to draw fuel toward them. In "ionic mode B" the pump polarity is reversed and the electrochemical magnetic dissonance can keep the fuel in it's place. The bypass pipes are wrapped in biasing coils to provide mode A or mode B attraction or repulsion. In ground school, they teach as "fuel come here" or "fuel - stay!"

The RNAV unit figures out where it is, by calculating where is not. In approach mode, the time delay on the GPS only allows the aircraft to calculate where it was which is subtracted from the IRS flight plan of where it wants to go (where it was - where it wants to go). Based on the implied position, the glideslope is determined. It's all self contained so that LOC and GS are supplementary.



It sometimes will, but not always. See above.

The Airbus uses Wink/Blink mode. When ditching, one inlet and outflow valve close (wink mode) and the other modulates to maintain a breathable level. If the level isn't good enough, the other inlet, and possibly the other outflow valve can close (blink mode) until the air is OK at which time the system reverts to wink mode (it never is stuck with "last air"). Upon touchdown in ditching command, the aircraft will automatically go to sink mode until the proper differential pressure is achieved.

The A330 altimetry is a tricky beast. Maybe an Airbus guy can clarify.

Are we talking about airplanes?

4. A plane does not know where to go. Someone has to tell it. They can tell it to use GPS or INS or a VOR or just go "that way."

5. Again, depends on how the autopilot is set up.

I hereby nominate this post as Post of the Week, and I predict it will be in contention for Post of the Year.

He started out pretty good with the "pumps" but the RNAV and wink/blink is pure genius. I want to drink beers with this guy.

Danger!
 

Danger!

This smells like possible plaintiff's attorney (presumably related to AF447) exploring creative ways to "interpret" commonly accepted and obvious definitions to suit nefarious purposes.

Think about what this discussion might be used for before you dive in.

Concur! Someone is asking very technically-specific questions and obviously has no knowledge of what these terms mean.

Caveat Emptor.

Those Airbus designers are awesome. Such automation! On my older aircraft I had to command sink mode after touchdown.

Pure genius CRM.