Archived

This topic is now archived and is closed to further replies.

markjj

777 Hydraulic Noise Before Touchdown

Recommended Posts

Hey guys, I just had a quick question that I'm sure many of you know the answer to. On any 777 landing you've been on or have seen on youtube, it is easy to tell that at around 30 feet AGL, there is a hydraulic hum that sounds similar to the flap extention and retraction noise. I read that this process is the sound of certain hydraulic pumps activating at exactly 30 feet above the runway. Can anyone confirm this? I was also wondering if this sound can be heard from up front in the cockpit, because it sure would be a nice little touch to hear while landing the PMDG 777, but I know that whatever it sounds like in the cockpit in real life will be correctly simulated in the PMDG. Thanks

Sincerely, Mark Javornik

Share this post


Link to post
Share on other sites
Help AVSIM continue to serve you!
Please donate today!

 

 


Can anyone confirm this? I was also wondering if this sound can be heard from up front in the cockpit, because it sure would be a nice little touch to hear while landing the PMDG 777, but I know that whatever it sounds like in the cockpit in real life will be correctly simulated in the PMDG.

 

I don't know what you're talking about (haven't flown in a 777 in ages), but I doubt that you can hear it up front.  That's just my thought, however.  You're well ahead of where that noise is likely coming from.

Share this post


Link to post
Share on other sites

Yup, it's one of the ADP's kicking in at exactly 30 feet in anticipation of the demand for the spoilers. I'm pretty sure they'll simulate this, but as far as the sound it would probably only be heard in the wing view. 

 

Brian W

Share this post


Link to post
Share on other sites

Im hoping and praying that they give us flap sounds, gear sounds, and the hydraulics sounds you're talking about when in wing views like they did for the NGX

Share this post


Link to post
Share on other sites

they probably will. "like they did in the NGX." And not have them in the cockpit where they can't be heard in real life. You probably won't be able to hear the flight attendants gossiping in the rear galley either.

Share this post


Link to post
Share on other sites

One of the reasons I like to sit by the TE Flaps! Absolutely love those sounds. Gives you a real feel for what's going on internally! 

Share this post


Link to post
Share on other sites

One of the reasons I like to sit by the TE Flaps! Absolutely love those sounds. Gives you a real feel for what's going on internally! 

 

You'll love the A380 then, those are noisy flaps for a modern plane. 

Share this post


Link to post
Share on other sites

You'll love the A380 then, those are noisy flaps for a modern plane. 

 

Well Alex, once upon a time I did have a little 'thing' for the A380....... Only lasted a month or two in 2009 LOL. Was after I done work experience at Heathrow - company stuck me with them the whole week pretty much! But yeah those sounds are.. quite loud - to say the least  :lol:  :P

Share this post


Link to post
Share on other sites

 

 


But yeah those sounds are.. quite loud - to say the least

 

Its funny how the plane is loud on some aspects but its whisper quiet in others/

 

 

 


Was after I done work experience at Heathrow - company stuck me with them the whole week pretty much!

 

Working around the MD-80's had the opposite effect on me, I've grown to extremely dislike that flying scrapheap lol

Share this post


Link to post
Share on other sites

 

 


But yeah those sounds are.. quite loud - to say the least   

 

I've always enjoyed the sounds of the cargo dog on the 'buses (the PTU).

 

Why?  Because it sounds like a dog.

Share this post


Link to post
Share on other sites

Yes indeed chaps - this sound will be heard on the wing views just like the video!   :Party:

Share this post


Link to post
Share on other sites

Yes indeed chaps - this sound will be heard on the wing views just like the video!   :Party:

Fantastic Armen!! ((-:

Share this post


Link to post
Share on other sites

 

 


But yeah those sounds are.. quite loud - to say the least

 

You have to wonder, are the flaps really much louder though, or is the A380 just extremely quiet, i remember reading an article about the pilots complaining that the A380 was too quiet and they couldnt get good quality rest because of noises they wouldnt normally hear during a flight.

Share this post


Link to post
Share on other sites

You have to wonder, are the flaps really much louder though, or is the A380 just extremely quiet, i remember reading an article about the pilots complaining that the A380 was too quiet and they couldnt get good quality rest because of noises they wouldnt normally hear during a flight.

 

Very true!  ^_^

Share this post


Link to post
Share on other sites

You have to wonder, are the flaps really much louder though, or is the A380 just extremely quiet, i remember reading an article about the pilots complaining that the A380 was too quiet and they couldnt get good quality rest because of noises they wouldnt normally hear during a flight.

I flew MAN-DXB and back a couple of weeks ago, outbound on an A380 and the return on the 77W, there is a massive difference in cabin noise between the two, the 777 of course being very noisy compared. I also did pickup on the noises as mentioned by the OP on approach in the 777 which sounded to me like a cargo door opening (it obviously wasn't). It sounded like there was a lot more going on even during taxi whereas with the 380 the only thing I heard of note was the flap retraction which was pretty loud, no doubt because of the sheer size and due to the requirements of the components moving them.

 

Lawrence Ashworth

Share this post


Link to post
Share on other sites

I was on a flight last week with my girl.  Airbus.  The PTU started going off, so I started barking like a dog.  She was confused and asked me multiple times to stop.  Did I?  Nope.  This flight was weird too.  The PTU was going on for at least a minute.  It got to the point where I started wondering about my sanity.  I was just sitting there, face pressed against the window barking with the PTU.  

 

That noise in the linked video is pretty cool though.  I hope we get it in wing view.  

Share this post


Link to post
Share on other sites

I've always enjoyed the sounds of the cargo dog on the 'buses (the PTU).

 

Why?  Because it sounds like a dog.

I actually have a phobia of dogs (got attacked when little) - so it's not the nicest sound in the world. (Runs to the bathroom)

 

Airbus! Messing with Luke Pabari since 1995!!

Share this post


Link to post
Share on other sites

I actually have a phobia of dogs (got attacked when little) - so it's not the nicest sound in the world. (Runs to the bathroom)

 

Airbus! Messing with Luke Pabari since 1995!!

 

Luke, is it THAT similar where you actually get a little anxious or is it because you've learned it's nickname?   :P

Share this post


Link to post
Share on other sites