Topic Author
Posts: 91
Joined: Thu Jun 08, 2000 11:10 pm

Airbus A319/320 Question

Mon Dec 13, 2004 2:58 am

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.

Posts: 5547
Joined: Wed Oct 08, 2003 3:39 pm

RE: Airbus A319/320 Question

Mon Dec 13, 2004 3:10 am

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

Smile - it confuses people!
Posts: 831
Joined: Sun Mar 14, 2004 2:41 pm

RE: Airbus A319/320 Question

Mon Dec 13, 2004 3:10 am

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."
Posts: 135
Joined: Sun Apr 25, 2004 6:47 am

RE: Airbus A319/320 Question

Mon Dec 13, 2004 3:12 am

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...
Remember when sex was safe and flying was dangerous?
User avatar
Posts: 17837
Joined: Fri Feb 27, 2004 9:54 pm

RE: Airbus A319/320 Question

Mon Dec 13, 2004 6:22 am

As I have explained repeatedly: It's them darned raccoons.  Smile
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
User avatar
Posts: 5388
Joined: Sat Mar 06, 2004 12:00 am

RE: Airbus A319/320 Question

Mon Dec 13, 2004 10:29 am

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.
Just because I stopped arguing, doesn't mean I think you are right. It just means I gave up!

Who is online

Users browsing this forum: Google [Bot], mcdu and 2 guests

Popular Searches On

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos