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Airbus A319/320 Question  
User currently offlineMasonaries From United States of America, joined Jun 2000, 93 posts, RR: 0
Posted (9 years 11 months 2 weeks 4 days 13 hours ago) and read 6133 times:

Pardon my ignorance but what is the noise these aircraft make as they are about to pull away from the gate? It sounds like a drill is tightening something below deck. Are they locking down the luggage compartment? Just wondering.

Bondo

5 replies: All unread, jump to last
 
User currently offlineLeskova From Germany, joined Oct 2003, 6075 posts, RR: 70
Reply 1, posted (9 years 11 months 2 weeks 4 days 13 hours ago) and read 6114 times:

I think the answers that are given in this thread should explain what you were hearing...

http://www.airliners.net/discussions/tech_ops/read.main/93654

Regards,
Frank



Smile - it confuses people!
User currently offlineUALFAson From United States of America, joined Mar 2004, 736 posts, RR: 4
Reply 2, posted (9 years 11 months 2 weeks 4 days 13 hours ago) and read 6114 times:

I think what you are probably hearing are the luggage bin doors closing. Yes, they are very loud and probably scary sounding to pax who aren't frequent flyers.

You may also hear a knocking noise during taxi. I've been told that's the hydraulics of the plane.

Noisy on the ground, but a smooth flyer (please no A vs. B flaming!)



"We hope you've enjoyed flying with us as much as we've enjoyed taking you for a ride."
User currently offlineNWB757300 From , joined Dec 1969, posts, RR:
Reply 3, posted (9 years 11 months 2 weeks 4 days 13 hours ago) and read 6104 times:

As was explained to me in the Tech/Ops forum, the sound is the Power transfer unit (PTU), where the (i believe) green and blue hydraulic systems power each other if they have a large difference in psi.

Hope this helps but tech/ops may be more informative...


User currently offlineStarlionblue From Greenland, joined Feb 2004, 17110 posts, RR: 66
Reply 4, posted (9 years 11 months 2 weeks 4 days 10 hours ago) and read 5998 times:

As I have explained repeatedly: It's them darned raccoons.  Smile


"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineLongHauler From Canada, joined Mar 2004, 5130 posts, RR: 43
Reply 5, posted (9 years 11 months 2 weeks 4 days 5 hours ago) and read 5990 times:

Close NWB757300:

Just as the second engine (engine 1) is starting, but before it reaches idle, the hydraulic system goes through a test. The PTU is tested by using the Yellow system power (powered by the engine 2 hydraulic pump) to power the Green system before engine 1 reaches idle.

When engine 1 reaches idle, then the Green system is powered by the engine driven pump, and the PTU shuts down.

The sound you hear when the cargo doors are closing, is the auxiliary Yellow pump. The cargo doors are Yellow hydraulic powered, and this auxiliary yellow pump, (like the PTU) is located under the cabin, mid fuselage. When a cargo door is opened or closed, you will hear this pump start/stop.



Never gonna grow up, never gonna slow down .... Barefoot Blue Jean Night
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