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APU ON but engines OFF!

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  • Commercial Member

If he's in 9th grade... why do all the references to the training he told us to google refer to college level course requirements? Is college now done at the age of 14 for all in Europe?

Ed Wilson

Mindstar Aviation
My Playland - I69

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In some countries/cultures, I believe the term "college" (and sometimes even "uni" or "university") are used to describe some of the grades in what we call "high school" in the US. This could be something we're encountering here.

  • Moderator

If he's in 9th grade... why do all the references to the training he told us to google refer to college level course requirements? Is college now done at the age of 14 for all in Europe?

Ed, he's fourteen years old, and in the equivalent of the 9th grade. Check his user profile. His internet provider is in France.

 

Post #11:

No, I have to do a training, in 3e (9th grade).

Fr. Bill    

AOPA Member: 07141481 AARP Member: 3209010556


     Avsim Board of Directors | Avsim Forums Moderator
  • Author

Thanks a lot,

 

Excuse my english, I know that it is not very good....

 

1) So when we put the selector (the one near master switch) to Start, it closes the APU BLEED Valve and opens the Starter valve?

 

2) How much time does it take from putting the selector to start and ignition in the "big" engine?

 

That's all!

Thanks

 

EDIT: Oh yes! College is not the same as in US. That is "lycée"

 

Primaire: From 1st grade to 5th grade

Collège: From 6th grade to 9th grade

Lycée: From 10th grade to 12th grade

Airbus A330-203

 

 


EDIT: Oh yes! College is not the same as in US. That is "lycée"

Collège: From 6th grade to 9th grade
Lycée: From 10th grade to 12th grade

 

Yes it is the same in New Zealand, College is grade 9 to grade 13. We don't call it High School here

(The USA forgets that they are only 4.4% of the worlds population and the rest of the world do things differently)  :lol:

Matthew Kane

I'm Dyslexic, what's an error to you is not to me 

  • Commercial Member

College, in the U.S., is where one goes for higher education and a degree. It is not part of one's primary education.

 

As for the rude comment about what we forget... snarky insults are inappropriate.

Ed Wilson

Mindstar Aviation
My Playland - I69

  • Commercial Member

1. Dont understand that question. What you are writing doesn't make sense. You need the air the APU produces (= bleeds!) to turn the big engine. So the APU bleed valve in your picture stays open, and the starter valve on the big engine is opened too. But the way to the packs and the other engines gets disconnected (= the engine you are starting gets "isolated", hence the term "isol valve" you may know) so that the APU bleed air turns only this one engine and nothing else. You need all the turning power you can get so that the big engine sucks in enough air to be able to ignite and keep the combustion going. But you don't always need the APU, you could use ground air as well.

 

2. On which plane and engine? You need to google the exact numbers. There should be reference values for each plane and engine type for the crew to check if the engine start goes as planned.

 

Another thing I dont understand is: why ask here? All this information is readily available on the net. Just google "jet engine start", read on and connect the dots. I thought the point of your Airbus school project was doing your own research?

LORBY-SI

As for the rude comment about what we forget... snarky insults are inappropriate.

 

Hardly an insult as I am American living overseas.....just an observation when you leave it that their is the rest of the world that does things different.  Majority of Americans never leave it is all, majority of Americans never hold a passport.  Nothing rude or insulting about that as people can live quite happily with where they are from

Matthew Kane

I'm Dyslexic, what's an error to you is not to me 

Being 13 in 8th grade here in America, I don't understand how age has to do with anything.  I have been around for quite some time, (lied about age to get in to some VA's... :ph34r: ) and have been able to survive just fine.  I was not treated any differently (going back to the lied about age thing) and was able to go from flying a great online game called gefs, to the PMDG 777 senior captain just using google.  I believe that this person would be able to learn just fine using Google.  No offence intended, I just think a bit more perseverance in trying to learn things yourself would help you in both lower level education up to the world's job market.  Instead of asking every question you have to the brilliant people of this forum, try google first.  I know that the great people here will be more than happy to help you, after you have tried to learn the concept yourself.

 

Again, no offense intended,

1251452

1251452-Matthew Tan

  • Commercial Member

Hardly an insult as I am American living overseas.....just an observation when you leave it that their is the rest of the world that does things different.  Majority of Americans never leave it is all, majority of Americans never hold a passport.  Nothing rude or insulting about that as people can live quite happily with where they are from

Per the Oxford Dictionary:

 

Definition of college in English:

 

noun

 

 

1 An educational institution or establishment, in particular.

 

1.1 One providing higher education or specialized professional or vocational training:

‘my brother wanted to go to college’

 

‘I’m at college studying graphic design’

 

 

1.2 US (Within a university) a school offering a general liberal arts curriculum leading only to a bachelor’s degree.

 

1.3(In Britain) any of a number of independent institutions within certain universities, each having its own teaching staff, students, and buildings.

 

1.4 British A private secondary school:

 

1.5 The teaching staff and students of a college considered collectively:

 

 

2 An organized group of professional people with particular aims, duties, and privileges:

French translation of college:

 

établissement d’enseignement supérieur

So... is Oxford incorrect? Does college not mean what it means?

 

Words have known definitions. Reusing them outside of their definition creates the confusion... it has nothing to do with where I'm from.

Ed Wilson

Mindstar Aviation
My Playland - I69

So... is Oxford incorrect? Does college not mean what it means?

 

Which goes back to my original comment. Other countries do things different. For example my local College where I currently live is called Aotea College which in the United States would be considered a 'High School'

 

 

Aotea College is a state co-educational secondary school located in Porirua, New Zealand. Founded in 1978, the school serves students for Year 9 to 13 (ages 12 to 18) across the northern suburbs of Porirua. 

 

http://en.wikipedia.org/wiki/Aotea_College

 

http://aotea.school.nz/

 

Also another difference between USA and New Zealand is kids here go to a College instead of a High School and they also have to wear a school uniform as you can see in the second link. Just a different way of raising and educating your kids is all. Similar in Australia as well.

 

 

Edit:

 

Oh yea and the Oxford Dictionary has publications for many different countries and their is a New Zealand edition just like their is for US, UK, Canada etc

 

Sometimes the Oxford spells it Colour or Centre which would not be the way you would spell it....again differences with each place around the world as many countries have different spelling and grammar rules. 

Matthew Kane

I'm Dyslexic, what's an error to you is not to me 

  • Commercial Member

I presented you with Oxford's (British University) definition that includes both the U.S. and the UK.

 

So sorry... this isn't a U.S. thing... despite your desire to make it that way.

Ed Wilson

Mindstar Aviation
My Playland - I69

In Canada, "High Schools" are called Secondary Schools, or if they are private, Colleges.  The really old schools (30+ years old) still have "High School" on the buildings, but the newer ones have Secondary School after the name.

 

It's interesting to see how things are different in each country...even province to province/state to state.

Devin
CYOW

So sorry... this isn't a U.S. thing... despite your desire to make it that way.

 

Hey Ed, you were the one inquiring about the differences in the first place mate. For me it is nothing to do with a USA thing as this is a forum of people from all over the world and there are differences mate. I have lived in the USA as both of my parents are American, but I have also lived in Canada, Australia and New Zealand.

 

Devin is correct because in Canada it is Secondary Schools and that just happens to be where I went to 'High School' or College or Secondary or whatever you want to call it. I went to Thornhill Secondary School which is in a suburb of Toronto. But it is true as in Canada they don't always call them High School either and they also have Colleges like Upper Canada College (which actually goes from Kindergarten to Grade 12).

 

I also agree with Devin it is interesting the way every country does things different and I consider myself lucky to have lived in 4 of them. I don't make anything a USA thing but I have no problem pointing out the differences when these things come up from time to time.

 

Cheers

 

The really old schools (30+ years old) still have "High School" on the buildings, but the newer ones have Secondary School after the name.

 

I never thought of this before but Thornhill Secondary School opened in 1954 and it has 'Secondary' and not 'High School' in its name. I also recall Canadian 'High Schools' being called Collegiate like L'amoreaux Collegiate Institute or Cedarbrae Collegiate Institute etc

Matthew Kane

I'm Dyslexic, what's an error to you is not to me 

  • Author

Thanks a lot Nuikati,

 

1) Ok, so basically you close the PFCV (Pack flow control valve)? Or is there another valve before, called isolation valve?

 

2) Well...I have just seen the pilots take the selector to ON and push the master switch for the desired engine. It takes 2-3 seconds on A320. But if they push the master switch, they open the LP fuel valve so they basically let the fuel go to the combusters. So for an A320, how much time does it take from starting the engine (Selector to start) and ignition (fuel to go inside the combuster)? Will do some researches.....

 

3) So when you put the selector to START, ECB will close and isolate the bleed air only to the engines. Then FADEC (ECU) will detect the bleed air and open the starter valve. Even if the pilot has pushed the master switch, FADEC will wait till engines are turning at max N%. It will then let the fuel go and ignitition will start. ECU will automatically close the starter valve and ECB will open the isolation valve to let bleed air from the "big engines" to go to packs. Am I right?

 

---> EDIT: Or maybe the isolation valve is not on the engine pneumatic system but only on the APU pneumatic system. So even if the isolation valve is closed, the bleed air from the big engines can go to the packs....

 

 

4) But there is only 1 bleed air valve and 2 packs (on A320). So the Pack controller opens the X bleed valve. So while engine start, APU will isolate the packs to let air go to the engines. But is there another valve to seperate bleed air for engine 1 and engine 2? What is it's name? Because bleed air goes to packs/engines by the APU bleed air valve but there are 2 engines...bleed air should seperate some where..

 

Thanks

Airbus A330-203

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