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acavpics
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Distinct noise inside 737 cabins

Fri Apr 12, 2019 9:10 pm

I've noticed that 737s have a very distinct humming sound in the cabin. It usually persists before throughout the flight, though it can be heard well only during taxi and when the a/c is idle. I'm not sure if its there in the cabins of original and classic 737's, but I've experienced it on NG's. And from online videos, I think it's present in the MAX's cabins as well. You can hear it very well in this Youtube video in the link below.

https://www.youtube.com/watch?v=s9vRku_hjvI

I would really love to know what the source of this noise is.
 
paullam
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Re: Distinct noise inside 737 cabins

Fri Apr 12, 2019 9:14 pm

Well that sound comes from the fuel pumps which are being switched on in order to run the APU or start the engines. You won’t really hear them in flight because wind and engine noises will be much louder.
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stratclub
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Re: Distinct noise inside 737 cabins

Fri Apr 12, 2019 10:30 pm

No, fuel pumps are pretty much silent from inside of the cabin. The sound you hear are electric hydraulic pumps and are turned on just before push back so that the aircraft has brakes.
 
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Re: Distinct noise inside 737 cabins

Sat Apr 13, 2019 1:17 am

stratclub wrote:
No, fuel pumps are pretty much silent from inside of the cabin. The sound you hear are electric hydraulic pumps and are turned on just before push back so that the aircraft has brakes.


It's not just before startup that it is heard. But rather from boarding till disembarking. I've also noticed that it is loudest towards the center of the a/c; You can't hear it that well if your seated far up front or way in the back. (Although if you are walking to the back, you will get a good dose of it as your walking past the middle rows).

And if it is because of electric pumps, how come we can't hear it on any other a/c?
 
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Re: Distinct noise inside 737 cabins

Sat Apr 13, 2019 9:34 am

If that's the case, it could be the air conditioning packs you are hearing. Where exactly do you hear the sound? If you walk back in the aircraft and stop exactly were the sound is, where is that in relationship to the wings? A/C packs are located pretty much under the wing, while the hydraulic pumps are located near the aft part of the wings in the wheel wells.

Why is the sound different on a 737? Probably just the way componants are located in relationship to the cabin.
 
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Re: Distinct noise inside 737 cabins

Sat Apr 13, 2019 1:51 pm

stratclub wrote:
If that's the case, it could be the air conditioning packs you are hearing. Where exactly do you hear the sound? If you walk back in the aircraft and stop exactly were the sound is, where is that in relationship to the wings? A/C packs are located pretty much under the wing, while the hydraulic pumps are located near the aft part of the wings in the wheel wells.

Why is the sound different on a 737? Probably just the way componants are located in relationship to the cabin.


You typically start to hear it after you walk past the first few rows of seats. - Or if there is first/business class, then you usually hear it as you are approaching the economy section.The sound is loudest when your standing right at the wings; around halfway between the front and back of the entire cabin. - But it can be heard well regardless of which side (left or right) you are sitting on. For example, in the link I entered in my first post, the video is being taken from a seat right near the engine ( 13F on AA's 738). Even if you just listen to the first few seconds of the video, you can hear it very clearly amid all the announcements, people talking etc.
 
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Re: Distinct noise inside 737 cabins

Sat Apr 13, 2019 8:27 pm

The AC packs are located under the fuselage at the wings. That's probably what you're hearing.
 
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Re: Distinct noise inside 737 cabins

Sat Apr 13, 2019 10:11 pm

acavpics wrote:
I've noticed that 737s have a very distinct humming sound in the cabin. It usually persists before throughout the flight, though it can be heard well only during taxi and when the a/c is idle. I'm not sure if its there in the cabins of original and classic 737's, but I've experienced it on NG's. And from online videos, I think it's present in the MAX's cabins as well. You can hear it very well in this Youtube video in the link below.

https://www.youtube.com/watch?v=s9vRku_hjvI

I would really love to know what the source of this noise is.


Packs would be turned off for engine start.
The humming continues during engine start.
'A' and 'B' Electric Motor Driven Hydraulic Pumps is what you are hearing.
They are both mounted near the forward bulkhead of the main wheel well, 'A' left side, 'B' right side.
Here is one of them,

Image
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Re: Distinct noise inside 737 cabins

Sun Apr 14, 2019 6:09 am

If the OP heard the sound at door one left, it could be the equipment cooling fans I suppose. A and B hydraulic pumps would not be running during boarding. They would be turned on just prior to push back.
 
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767333ER
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Re: Distinct noise inside 737 cabins

Sun Apr 14, 2019 5:38 pm

acavpics wrote:
I've noticed that 737s have a very distinct humming sound in the cabin. It usually persists before throughout the flight, though it can be heard well only during taxi and when the a/c is idle. I'm not sure if its there in the cabins of original and classic 737's, but I've experienced it on NG's. And from online videos, I think it's present in the MAX's cabins as well. You can hear it very well in this Youtube video in the link below.

https://www.youtube.com/watch?v=s9vRku_hjvI

I would really love to know what the source of this noise is.
The original reply to this question is correct, it is the fuel pumps. On most generic engine under wing aircraft two fuel pumps per wing tank located somewhere inside the inboard portion of the wing and they are usually most audible in the exit row and these fuel pumps are very audible inside the aircraft and outside as well. On the 737 typically one is turned on with APU operation and the others turned on during the system setup when they will also turn one or both of the hydraulic pumps on. The sound that’s in question doesn’t come from the hydraulic pumps per se because the 737 has and always has had 2 different makes of hydraulic pump a customer can select from. The ones AA use seem to make a noise almost exactly an octave higher than the fuel pump so the sound really just gets blended in, but many other customers use the other one that sounds completely different so this sound can’t be just the hydraulics. I also know that fuel pumps generally tend to make a motor noise as well they generally tend to make a sort of whistling noise like noisy plumbing does. I have a video that would help explain this, it is a flight simulator video, but it is useful for this:
https://youtu.be/jl1oDsT4Wb0
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Re: Distinct noise inside 737 cabins

Wed Apr 17, 2019 5:06 am

767333ER wrote:
acavpics wrote:
I've noticed that 737s have a very distinct humming sound in the cabin. It usually persists before throughout the flight, though it can be heard well only during taxi and when the a/c is idle. I'm not sure if its there in the cabins of original and classic 737's, but I've experienced it on NG's. And from online videos, I think it's present in the MAX's cabins as well. You can hear it very well in this Youtube video in the link below.

https://www.youtube.com/watch?v=s9vRku_hjvI

I would really love to know what the source of this noise is.
The original reply to this question is correct, it is the fuel pumps. On most generic engine under wing aircraft two fuel pumps per wing tank located somewhere inside the inboard portion of the wing and they are usually most audible in the exit row and these fuel pumps are very audible inside the aircraft and outside as well. On the 737 typically one is turned on with APU operation and the others turned on during the system setup when they will also turn one or both of the hydraulic pumps on. The sound that’s in question doesn’t come from the hydraulic pumps per se because the 737 has and always has had 2 different makes of hydraulic pump a customer can select from. The ones AA use seem to make a noise almost exactly an octave higher than the fuel pump so the sound really just gets blended in, but many other customers use the other one that sounds completely different so this sound can’t be just the hydraulics. I also know that fuel pumps generally tend to make a motor noise as well they generally tend to make a sort of whistling noise like noisy plumbing does. I have a video that would help explain this, it is a flight simulator video, but it is useful for this:
https://youtu.be/jl1oDsT4Wb0


I’m gonna second this and say it’s the fuel pump(s) also. The pumps on the 737 are very audible throughout most of the aircraft and as you said one of them is on anytime the APU is running or being started.
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Re: Distinct noise inside 737 cabins

Wed Apr 17, 2019 9:31 am

This is why I so (sometimes) love this site. Now I know what that noise is - always assumed it was just noisy a/c. Now, time to browse the other usual topics such as 'What if Dan-Air were still around, would they be flying the Max?' lol....
 
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Re: Distinct noise inside 737 cabins

Thu Apr 18, 2019 1:52 am

acavpics wrote:
I've noticed that 737s have a very distinct humming sound in the cabin. It usually persists before throughout the flight, though it can be heard well only during taxi and when the a/c is idle. I'm not sure if its there in the cabins of original and classic 737's, but I've experienced it on NG's. And from online videos, I think it's present in the MAX's cabins as well. You can hear it very well in this Youtube video in the link below.

https://www.youtube.com/watch?v=s9vRku_hjvI

I would really love to know what the source of this noise is.


Those are the Hydraulic pumps, they are underneath the center cabin where the video is taken from. They are the loudest items after the engines and packs. Very much doubt they are fuel pumps. Many times have heard the hydraulic pumps on at the gate after arrival and well before departure.

Video of hydraulic pumps on......
https://www.youtube.com/watch?v=cld62K4ntbk

Video of packs on which would have a APU running, and on those NGs without a DC pump, the flight deck crew would turn on IIRC, the Left Main Aft Boost Pump. You would not hear the fuel pumps,
https://www.youtube.com/watch?v=fMEqU6HRjhs
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richardc1983
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Re: Distinct noise inside 737 cabins

Thu May 09, 2019 8:58 pm

I love that sound! Always hear it on Ryanair flights, the sound seems to get louder with the engine revs.

What do the air conditioning packs sound like though?
 
Whiteguy
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Re: Distinct noise inside 737 cabins

Thu May 16, 2019 6:17 am

stratclub wrote:
No, fuel pumps are pretty much silent from inside of the cabin. The sound you hear are electric hydraulic pumps and are turned on just before push back so that the aircraft has brakes.


Actually the “A” system hydraulics are turned off for push back...
Last edited by Whiteguy on Thu May 16, 2019 6:20 am, edited 1 time in total.
 
paullam
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Re: Distinct noise inside 737 cabins

Thu May 16, 2019 6:18 am

Whiteguy wrote:
stratclub wrote:
No, fuel pumps are pretty much silent from inside of the cabin. The sound you hear are electric hydraulic pumps and are turned on just before push back so that the aircraft has brakes.


Actually the “A” system hydraulics aren’t turned off for push back...


That’s exactly what stratclub said.
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Re: Distinct noise inside 737 cabins

Thu May 16, 2019 6:21 am

paullam wrote:
Whiteguy wrote:
stratclub wrote:
No, fuel pumps are pretty much silent from inside of the cabin. The sound you hear are electric hydraulic pumps and are turned on just before push back so that the aircraft has brakes.


Actually the “A” system hydraulics aren’t turned off for push back...


That’s exactly what stratclub said.


My bad, edited.....the “A” system are turned off!!
 
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Re: Distinct noise inside 737 cabins

Tue May 21, 2019 4:47 pm

If I had to guess it would be the compressor used to pressurize the potable water when aircraft bleeds are off at the gate.
 
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Re: Distinct noise inside 737 cabins

Tue May 21, 2019 7:18 pm

Whiteguy wrote:
paullam wrote:
Whiteguy wrote:

Actually the “A” system hydraulics aren’t turned off for push back...


That’s exactly what stratclub said.


My bad, edited.....the “A” system are turned off!!

The "A" pumps are never turned off. This is because they are engine driven pumps and only produce pressure when the engines are operating. The S/O solanoid energizes to shut off "A" system hydralics and could potentily burn out if left in the selected off position for long periods of time.

The electric pumps are on the "B" system and would be turned on for pushback to provide brakes if the towbar became disconnected or the shear pins on the towbar sheared.
Last edited by stratclub on Tue May 21, 2019 7:21 pm, edited 1 time in total.
 
paullam
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Re: Distinct noise inside 737 cabins

Tue May 21, 2019 7:20 pm

stratclub wrote:
Whiteguy wrote:
paullam wrote:

That’s exactly what stratclub said.


My bad, edited.....the “A” system are turned off!!

The "A" pumps are never turned off. This is because they are engine driven pumps and only produce pressure when the engine is operating. The S/O solanoid energizes to shut off "A" system hydralic and could potentily burn out if left in the selected off position for long periods of time.

The electric pumps are on the "B" system and would be turned on for pushback for brakes.


...or be left on at the gate when using the airstair.
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Re: Distinct noise inside 737 cabins

Tue May 21, 2019 7:31 pm

paullam wrote:
stratclub wrote:
Whiteguy wrote:

My bad, edited.....the “A” system are turned off!!

The "A" pumps are never turned off. This is because they are engine driven pumps and only produce pressure when the engine is operating. The S/O solanoid energizes to shut off "A" system hydralic and could potentily burn out if left in the selected off position for long periods of time.

The electric pumps are on the "B" system and would be turned on for pushback for brakes.


...or be left on at the gate when using the airstair.

No, the airstair is not hydralic it is electric and IIRC can be deployed on battery power on a Cold/Dark airplane.
 
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Re: Distinct noise inside 737 cabins

Tue May 21, 2019 7:33 pm

stratclub wrote:
paullam wrote:
stratclub wrote:
The "A" pumps are never turned off. This is because they are engine driven pumps and only produce pressure when the engine is operating. The S/O solanoid energizes to shut off "A" system hydralic and could potentily burn out if left in the selected off position for long periods of time.

The electric pumps are on the "B" system and would be turned on for pushback for brakes.


...or be left on at the gate when using the airstair.

No, the airstair is not hydralic it is electric and IIRC can be deployed on battery power on a Cold/Dark airplane.


Ok that’s new to me so I stand corrected. Thanks for clearing that up!
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Re: Distinct noise inside 737 cabins

Tue May 21, 2019 11:39 pm

stratclub wrote:
Whiteguy wrote:
paullam wrote:

That’s exactly what stratclub said.


My bad, edited.....the “A” system are turned off!!

The "A" pumps are never turned off. This is because they are engine driven pumps and only produce pressure when the engines are operating. The S/O solanoid energizes to shut off "A" system hydralics and could potentily burn out if left in the selected off position for long periods of time.

The electric pumps are on the "B" system and would be turned on for pushback to provide brakes if the towbar became disconnected or the shear pins on the towbar sheared.


The “A” are shut off for push back where I am...
 
stratclub
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Re: Distinct noise inside 737 cabins

Wed May 22, 2019 5:01 am

My bad. the last 737's I worked on were the 737-100 and 200 back in 1987 where as "A" system was powered by the EDPs (Engine Driven Pumps) and "B" system was powered by the EMDPs (Electric Motor Driven Pumps).

You are referring to the 737-300 and newer. Now that we are talking the same thing, and since the brakes are powered by both "A" and "B" system why does it matter if you use either or both EMDPs for brakes when towing? After some study, I think I answered my own question. "A" system is alternate brakes and would tend to transfer fluid to the "B" system through the return, is that correct?

Image
 
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Re: Distinct noise inside 737 cabins

Thu May 23, 2019 2:28 am

Aircraft is a 737NG, not a old 737, lot's of differences. Don't know where somebody is.
The sound is the hydraulic pumps, not the fuel pumps.
EMDPs are on for pushback, to have brake pressure in case of breakaway.

Old 737s, 'A' System was driven by EDPs, 'B' System was EMDPs, with a Grd Interconnect like the 727.

Image

Like the 737 NG in the video, 'A' System has a EDP and EMDP, 'B' System also has EDP and EMDP.

Image
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Re: Distinct noise inside 737 cabins

Fri May 24, 2019 9:03 pm

stratclub wrote:
My bad. the last 737's I worked on were the 737-100 and 200 back in 1987 where as "A" system was powered by the EDPs (Engine Driven Pumps) and "B" system was powered by the EMDPs (Electric Motor Driven Pumps).

You are referring to the 737-300 and newer. Now that we are talking the same thing, and since the brakes are powered by both "A" and "B" system why does it matter if you use either or both EMDPs for brakes when towing? After some study, I think I answered my own question. "A" system is alternate brakes and would tend to transfer fluid to the "B" system through the return, is that correct?

Image


The “A” pumps are shut off to depressurize the nose wheel steering system, as a back on the lock out pin being installed.
 
arcticcruiser
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Re: Distinct noise inside 737 cabins

Sat May 25, 2019 12:20 am

Whiteguy wrote:
stratclub wrote:
My bad. the last 737's I worked on were the 737-100 and 200 back in 1987 where as "A" system was powered by the EDPs (Engine Driven Pumps) and "B" system was powered by the EMDPs (Electric Motor Driven Pumps).

You are referring to the 737-300 and newer. Now that we are talking the same thing, and since the brakes are powered by both "A" and "B" system why does it matter if you use either or both EMDPs for brakes when towing? After some study, I think I answered my own question. "A" system is alternate brakes and would tend to transfer fluid to the "B" system through the return, is that correct?

Image


The “A” pumps are shut off to depressurize the nose wheel steering system, as a back on the lock out pin being installed.


Somebody still do that? I thought most operators quit doing that on the Classics already. Stratclub is back in ancient history.
 
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CALTECH
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Re: Distinct noise inside 737 cabins

Sun May 26, 2019 10:47 am

On the 737 NG, both A and B system EMDPS are turned on before pushback or tow with the Bypass Pin installed, according to our checklists.
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Re: Distinct noise inside 737 cabins

Mon May 27, 2019 9:46 pm

acavpics wrote:
I've noticed that 737s have a very distinct humming sound in the cabin. It usually persists before throughout the flight, though it can be heard well only during taxi and when the a/c is idle. I'm not sure if its there in the cabins of original and classic 737's, but I've experienced it on NG's. And from online videos, I think it's present in the MAX's cabins as well. You can hear it very well in this Youtube video in the link below.

https://www.youtube.com/watch?v=s9vRku_hjvI

I would really love to know what the source of this noise is.

Definitely the fuel pumps, and not the hydraulic pumps like some here are saying.

Here's a great video where you can hear the difference:
https://www.youtube.com/watch?v=VrEAyPqmJJY

The fuel pumps are switched on at 0:38
The hydraulic pumps are switched on at 1:58

richardc1983 wrote:
I love that sound! Always hear it on Ryanair flights

Yes, because unlike at other airlines both the fuel and hydraulic pumps remain on during turnarounds.
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Re: Distinct noise inside 737 cabins

Thu May 30, 2019 10:30 pm

Now I'm going to say IDK. Upon further review, did a video, but with my bad hearing, if I stop before the wing, I can't tell the difference between the two. The noise gets louder the further back on the wing you go with the EMDPs and fuel pumps. But they sound a lot alike before the wing. With the OP's post and video, the position of the video is at the front of the wing. The other video is from behind the wing. Plus with the aircraft being pushed back, I do believe they must have the Hyd EMDPs on for braking. But like I said, IDK. I'll post a video.
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Tarikhema
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Re: Distinct noise inside 737 cabins

Sun Jun 02, 2019 12:04 pm

The noise gets louder the further back on the wing you go with the EMDPs and fuel pumps.

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