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PTU On Airbuses  
User currently offlineCricri From France, joined Oct 1999, 581 posts, RR: 7
Posted (13 years 4 months 2 weeks 2 days 23 hours ago) and read 1774 times:

Continuing my training, one thing I cannot find even in the Airbus FCOM :
How much "psi" pressure has the Power Transfert Unit please?
Tx for your replies.
Regards.

PS : Bill, if you're hanging around, please do not forget me  Wink/being sarcastic

22 replies: All unread, jump to last
 
User currently offlineJG From United States of America, joined Jun 2005, 0 posts, RR: 1
Reply 1, posted (13 years 4 months 2 weeks 2 days 23 hours ago) and read 1661 times:

Normal sytem pressure. Approx. 3000psi

User currently offlineCricri From France, joined Oct 1999, 581 posts, RR: 7
Reply 2, posted (13 years 4 months 2 weeks 2 days 23 hours ago) and read 1657 times:

Tx JG  Smile/happy/getting dizzy

User currently offlineA/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4
Reply 3, posted (13 years 4 months 2 weeks 2 days 17 hours ago) and read 1637 times:

On the A300 600R there is a PTU on the blue system driven by the green system which is used in event of a left engine failure or on the ground and there is also one on the yellow system , the pump output on the PTU is about 90 1/min at standard system pressure 3000 psi .

User currently offlineOldman From United States of America, joined Sep 2006, 0 posts, RR: 0
Reply 4, posted (13 years 4 months 2 weeks 2 days 17 hours ago) and read 1634 times:

Airtrain, JG answered that post above yours. 3000 PSI. Period! He did not want to know any more detail. I'll bet if everyone would look before they leap and just reply to specifics this forum would download much faster.  Smokin cool

User currently offlineHeavyJet From , joined Dec 1969, posts, RR:
Reply 5, posted (13 years 4 months 2 weeks 2 days 16 hours ago) and read 1637 times:

I agree that some people seem to try and impress everyone with their system knowledge by adding superfluous information which exceeds the original poster's question. However, I can just about guarantee the next question from someone would be, "what's a PTU?".

Couple of things...

First, since just about EVERY subject has been discussed to death on these forums. I think it would greatly cut down on the number of post if folks would simply do a "search" before asking a question.

and second..

What's a 16-20 yr old doing with a Airbus FCOM and why would you want to spent your free time reading one? Doesn't anyone get out and play sports anymore?!?  Smile




User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 34
Reply 6, posted (13 years 4 months 2 weeks 2 days 14 hours ago) and read 1628 times:

Something odd yet consistant I've noticed with the G/B & G/Y A300-600 PTU's (HeavyJet, perhaps you can check this on your aircraft).

When I run for example the green/blue PTU, the green system is 3000 psi but the blue is 3100 psi. This is odd in the fact that the green system is driving the blue sys. Conventional wisdom being that the system being driven wouldn't produce more pressure than the system driving it.



You're only as good as your last departure.
User currently offlineOldman From United States of America, joined Sep 2006, 0 posts, RR: 0
Reply 7, posted (13 years 4 months 2 weeks 2 days 14 hours ago) and read 1625 times:

HeavyJet, I agree with you 100% At the start of the forum it says for advanced professional and knowledgeable amateurs. We both remember when this stuff was relevant. All the numbers and pressure settings etc. Then that took a back seat, and oral questions would be, "What is the oil over heat limit? Ans. in the red. And now not even that, just click a page and the system displays right there. Who cares unless your going to build one!
By the way, you must have a day off? Thought you guys slept all day?  Smile Regards, Oldman


User currently offlineJG From United States of America, joined Jun 2005, 0 posts, RR: 1
Reply 8, posted (13 years 4 months 2 weeks 2 days 14 hours ago) and read 1625 times:

What's a 16-20 yr old doing with a Airbus FCOM and why would you want to spent your free time reading one? Doesn't anyone get out and play sports anymore?!?

What about girls? These guys have the rest of their responsible lives to read FCOM's




User currently offlineOldman From United States of America, joined Sep 2006, 0 posts, RR: 0
Reply 9, posted (13 years 4 months 2 weeks 2 days 14 hours ago) and read 1629 times:

Amen to that Son!!

User currently offlineHeavyJet From , joined Dec 1969, posts, RR:
Reply 10, posted (13 years 4 months 2 weeks 2 days 13 hours ago) and read 1626 times:

FDXmech,

Ya got me on that one. Guess maybe it could be an anomaly based on where the pressure sensor gets it's reading. Then again, it is an Airbus, so who knows!

I'd check it out for you but I've been restricted from *playing* with the PTU switches unless absolutely required to do so (um...I'll get the f/o to do it!).

BTW, do you guys operate the A300B4 models? Thought I saw one the other day in BWI. I thought you just had the A300-600's and A310's.


Oldman(Pappy),

Yes, I'm usually hanging upside down in the hotel closet (bat mode) or laying in my coffin during daylight hours but I'm off today. Smile

Temps? Pressures? About to exceed a limit, indicator turns amber. Exceed a limit, indicator turns red. What's the limit? Not important, just know the difference between amber and red!

Big difference between the thinking during my B727 days (know everything) and my current B757/A300 days (you don't need to know that).

Cheers!


User currently offlineOldman From United States of America, joined Sep 2006, 0 posts, RR: 0
Reply 11, posted (13 years 4 months 2 weeks 2 days 13 hours ago) and read 1625 times:

Yes, my favorite for a long time also was the 727, then came the 75@76 enjoy your time off, and remember, "Always keep the tail behind you"  Smile

User currently offlineSabenapilot From Belgium, joined Feb 2000, 2714 posts, RR: 47
Reply 12, posted (13 years 4 months 2 weeks 2 days 3 hours ago) and read 1598 times:

BTW guys,
I don't know if you know this, but in general the hydraulic pressure on all planes is around 3000 psi!

This has everything to do with the fact that this provides you with a good/fast operating system shaped into acceptable dimentions and with a fairly low weight.

Lower pressure would reduce the weight of the system due to the fact that is has to be less strong, but it would also reduce the efficiency and increase the response time.
Higher pressure would reduce the response time and increase the efficiency, but it would also force us to make the system much havier in order to resist the higher pressure forces.


User currently offlineDC10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 13, posted (13 years 4 months 2 weeks 2 days 3 hours ago) and read 1595 times:

>However, I can just about guarantee the next question from someone would be, "what's a PTU?".<

Heavy,
The originating post contained the answer.
Power Transfer Unit

>Always keep the tail behind you<

Oldman,
True words of wisdom, once again!  Smile




"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3700 posts, RR: 34
Reply 14, posted (13 years 4 months 2 weeks 2 days 2 hours ago) and read 1597 times:
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Airbus PTU's are gutless compared to DC10 reversable motor pumps. I recall in my A310 days trying to function chk the Wing Tip Brakes. With the flaps & slats operating on the elect pumps & PTU there was not enough press left to actuate thw WTB's. On the DC10 you could operate all the high hydraulic flow rate flight controls at the same time and not loose more than about 750 psi.

Regarding training I remember when I took my RR Spey type licence the CAA surveyor gave me a sectioned picture of the Combined Acceleration & Speed Control Unit (FCU) and I had to explain how it worked. These days if you ask an instructor how something works you are told "just fine"


User currently offlineHeavyJet From , joined Dec 1969, posts, RR:
Reply 15, posted (13 years 4 months 2 weeks 1 day 22 hours ago) and read 1587 times:

DC10hound,

>>Heavy,
The originating post contained the answer.
Power Transfer Unit<<

Yea, it explained what the acronym stood for but didn't explain what a PTU does. That's what I was talking about.


User currently offlineOldman From United States of America, joined Sep 2006, 0 posts, RR: 0
Reply 16, posted (13 years 4 months 2 weeks 1 day 20 hours ago) and read 1579 times:

Off we go again? Please read the original question, then the first reply by someone named JG. Then please read the reply by HeavyJet. A simple answer was all the orig. post asked. Let us all not try to re invent the wheel. Smile Cheers

User currently offlineDC10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 17, posted (13 years 4 months 2 weeks 1 day 18 hours ago) and read 1574 times:

DC10hound,

>>Heavy,
The originating post contained the answer.
Power Transfer Unit<<

>>Yea, it explained what the acronym stood for but didn't explain what a PTU does. That's what I was talking about. <<


Heavy,
The point is well taken. Excuse me for being forward. I was out at the Pub quite late last night, and did not review the context of the previous posts very well :O

It seems that no one has succinctly addressed what the PTU does, and where it exists...
I'm gonna have to get the books on the where it is part...

Oldman,

We are not trying to "reinvent" anything.
Final Answer: 3000PSI.
 Wink/being sarcastic




"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 34
Reply 18, posted (13 years 4 months 2 weeks 1 day 16 hours ago) and read 1576 times:

HeavyJet,

Just A300-600 and A310-200's. Maybe the A310-200 threw you off because of the lack of winglets (fences). Although I hear some used A310-300's are in the pipeline.

Not to beat a dead horse but.....
The G/B/Y systems all indicate 3000 but only while being powered by the PTU does the blue or yellow exceed green. DC10hound, have you noticed this?



You're only as good as your last departure.
User currently offlineA/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4
Reply 19, posted (13 years 4 months 2 weeks 1 day 16 hours ago) and read 1568 times:

Hey lets not make this into a winging forum us amateurs are on the site to learn from the people who have been there and done it, but I do agree the awnsers should be brief and just to the point and I dont have an A300 FCOM and I certainly have limited system knowledge I have just learnt it.

User currently offlineHeavyJet From , joined Dec 1969, posts, RR:
Reply 20, posted (13 years 4 months 2 weeks 1 day 14 hours ago) and read 1570 times:

FDXmech,

>>The G/B/Y systems all indicate 3000 but only while being powered by the PTU does the blue or yellow exceed green. DC10hound, have you noticed this?<<

No, I haven't noticed this. However, checking the operation of the PTU(s) is not a required preflight check for us pilot types. I'd have to ask one of our mechanics.


User currently offlineOldman From United States of America, joined Sep 2006, 0 posts, RR: 0
Reply 21, posted (13 years 4 months 2 weeks 1 day 14 hours ago) and read 1569 times:

No Problem here, I definately understand how the IFR WX can go thru the Pubs and effect future flight planning for the next day. Been there done that, got that "T" shirt. Keep the tail behind you.  Smile

User currently offlineAvt007 From Canada, joined Jul 2000, 2132 posts, RR: 5
Reply 22, posted (13 years 4 months 2 weeks 1 day 10 hours ago) and read 1558 times:

Oldman,heavyjet; If everyone restricted themselves to doing searches, or one-answer posts, this forum would shrivel up and die. As it is , you can check it once or twice a week, and little has been posted. If someone asks a question previously covered, you aren't obligated to answer! If folks want to put in their two cents worth, more power to them! What else is this site here for?

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