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Loud Engine Noise On CX 744  
User currently offline744 From United States of America, joined Aug 2001, 449 posts, RR: 0
Posted (6 years 2 months 1 week 2 days 14 hours ago) and read 4718 times:

Hello All,
I just flew back from HKG yesterday on CX 870 Tail Number B-HUG.
I got a whole row 63 ABC to myself in the rear end of Economy Cabin. As soon as the aircraft went airborne, the engines were so loud that we could not hear any PA announcements or the crew requests during beverage and meal services. It was very hard to even hear the inflight entertainment system throught the flight. I could bearly sleep as the engines were buzzing all night. I have flown many other 744's and have never experienced this. On the outbound flight on CX 744, I was seated in row 53K (whole row) tail number B-HOZ where similar problem was faced. What would be the reason for the engines to be super loud? Is it because the aircrafts would have been really old? Can thoughts?
Rgds,
744

12 replies: All unread, jump to last
 
User currently offlineKappel From Suriname, joined Jul 2005, 3533 posts, RR: 17
Reply 1, posted (6 years 2 months 1 week 2 days 13 hours ago) and read 4601 times:

It's because you were sitting in the back, even the a340 is loud in the back. If you sit above or in front of the wings the next time, you'll notice a big difference. It has nothing to do with the age of the aircraft.


L1011,733,734,73G,738,743,744,752,763,772,77W,DC855,DC863,DC930,DC950,MD11,MD88,306,319,320,321,343,346,ARJ85,CR7,E195
User currently offlineSpacecadet From United States of America, joined Sep 2001, 3667 posts, RR: 12
Reply 2, posted (6 years 2 months 1 week 2 days 12 hours ago) and read 4529 times:



Quoting Kappel (Reply 1):
It has nothing to do with the age of the aircraft.

It might have something to do with it, but maybe not in the way he means.

In a lot of older aircraft, various interior panels are just a little bit loose, and they will vibrate during cruise if the frequency of the sound from the engines matches their harmonics. The vibration can often be more violent than you'd expect - I've found panels that were vibrating with my hand, and they were vibrating so hard that I couldn't stop them by pressing down.

In an older plane (or at least a plane with an older interior), you can have a dozen panels vibrating in various parts of the cabin and giving off noise, and it can sound like a pretty terrible racket. It's especially true in the back of the plane where it's louder anyway and you can't easily tell that the sound isn't all coming from outside.

Also, that plane does have RR engines - I'm not sure how loud they are compared to PW or GE engines, but that might account for some of the difference if you're used to the other ones.



I'm tired of being a wanna-be league bowler. I wanna be a league bowler!
User currently offlineViscount724 From Switzerland, joined Oct 2006, 25983 posts, RR: 22
Reply 3, posted (6 years 2 months 1 week 2 days 12 hours ago) and read 4521 times:

The last few rows on all jets are the noisiest. However I have never thought that 747s were notably loud at the rear. It's also possible that some of the noise could have been due to faulty seals in the rear cabin doors. I've flown on quite a few aircraft where the areas near the doors are very noisy due to poor door seals which causes air to escape with resulting noise.

User currently offlineAA737-823 From United States of America, joined Mar 2000, 5943 posts, RR: 11
Reply 4, posted (6 years 2 months 1 week 2 days 11 hours ago) and read 4415 times:



Quoting Spacecadet (Reply 2):
Also, that plane does have RR engines - I'm not sure how loud they are compared to PW or GE engines, but that might account for some of the difference if you're used to the other ones.

I work outside at the busiest 747 airport in the US. I don't know about INSIDE the cabin, as all I've flown on are PW and GE powered, but from outside, RR is DEFINITELY loudest of the three,


User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 5, posted (6 years 2 months 1 week 2 days 7 hours ago) and read 4348 times:

From the Information provided,I would suspect Insulation blankets not in place as the culprit  Smile
regds
MEL.



Think of the brighter side!
User currently offlineImperialEagle From United States of America, joined Jan 2006, 2630 posts, RR: 22
Reply 6, posted (6 years 2 months 1 week 2 days 7 hours ago) and read 4343 times:



Quoting Kappel (Reply 1):
It's because you were sitting in the back, even the a340 is loud in the back. If you sit above or in front of the wings the next time, you'll notice a big difference. It has nothing to do with the age of the aircraft.

 checkmark 

A heavy aircraft with powerful engines is producing some serious thrust to remain at altitude. A seat behind the wing is a good place to experience this issue. The rear of a maxed-out 764 comes to mind. It'll wear you out on a long flight. At the very least get some foam earplugs as it helps reduce the noise fatigue a lot.



"If everything seems under control, you're just not going fast enough!"
User currently offlineImiakhtar From , joined Dec 1969, posts, RR:
Reply 7, posted (6 years 2 months 1 week 2 days 6 hours ago) and read 4329 times:

At MTOW for the 744 (875klb), the official engine noise figures at TO for the 3 manufacturers are:

1. GE CF6-80C2B1F = 98.2dB (103.0 dB limit)

2. PW 4056 Package B / Phase I = 98.5dB

3. RR RB211-524H2 = 98.8dB

There's not much in it!

Just to add, the A380 at MTOW is 94dB with RR being slightly quieter.

Regards!


User currently offlineSashA From Russia, joined May 1999, 861 posts, RR: 0
Reply 8, posted (6 years 2 months 1 week 1 day 5 hours ago) and read 4210 times:

Thanks for the tip guys, now I know where to sit to enjoy the noise  Smile


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User currently offlineBabaero From Philippines, joined Jan 2002, 468 posts, RR: 0
Reply 9, posted (6 years 2 months 5 days 17 hours ago) and read 4054 times:

I dont think you flew on B-HOZ outbound. Thats already ready been converted to a BCF freighter

User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 10, posted (6 years 2 months 5 days 17 hours ago) and read 4049 times:



Quoting Kappel (Reply 1):
It's because you were sitting in the back

BINGO......there is your only answer.



"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineUnattendedBag From United States of America, joined Oct 2003, 2342 posts, RR: 1
Reply 11, posted (6 years 2 months 4 days 6 hours ago) and read 3949 times:



Quoting Kappel (Reply 1):
It's because you were sitting in the back, even the a340 is loud in the back.



Quoting EMBQA (Reply 10):
BINGO......there is your only answer.

that's probably one reason why "First Class" is in the front.  Smile



Slower traffic, keep right
User currently offlineViscount724 From Switzerland, joined Oct 2006, 25983 posts, RR: 22
Reply 12, posted (6 years 2 months 4 days 6 hours ago) and read 3948 times:



Quoting UnattendedBag (Reply 11):
Quoting Kappel (Reply 1):
It's because you were sitting in the back, even the a340 is loud in the back.



Quoting EMBQA (Reply 10):
BINGO......there is your only answer.

that's probably one reason why "First Class" is in the front.

And why it was in the back on propeller types.


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