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G-BZZJ, What The Hell Was That Noise?  
User currently offlineVs744 From United Kingdom, joined Aug 2001, 677 posts, RR: 1
Posted (10 years 8 months 3 weeks 6 days 2 hours ago) and read 2655 times:

I've just arrived back from Genoa in Italy on Ryanair's ex BUzz 737-300 (BZZJ) and it wasnt a pleasent experience!

Shortly after take off, a rumbling noise started beneath my feet (at at the over wing exit) and it went on for about 10 minutes, it sounded like it was a generator of some sort that was faulty (or a fuel pump) anyway, this went away after the a/c gained speed and levelled off at 34000. Then on descent, it started again, and this time was much worse. There was so much vibration that the can of coke on the tray was physically moving! It was also making one hell of a racket, and didnt stop until 5 minutes before landing.

Does anyone know what this is? im quite a seasoned flyer, but have never heard anything like this! it was towards the forward section of the wing area, and central...could it be a fuel pump? If anyone knows, then i'd be interested to know! and also whether its safe?

Thanks!

7 replies: All unread, jump to last
 
User currently offlineAndz From South Africa, joined Feb 2004, 8461 posts, RR: 10
Reply 1, posted (10 years 8 months 3 weeks 6 days 1 hour ago) and read 2527 times:
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I had a similar experience on my one and only 757 flight a couple of years ago, LGA-DTW with NorthWest. I was sitting at the aisle in an overwing row, about 15 min into the flight there was a loud hissing noise like escaping compressed air, seemed to be coming from the right engine. It went for about 30 seconds then stopped, but happened a few times during the flight. Having never flown on a 757 before or since I don't know if this is a normal occurence but I crapped myself, despite all the other pax looking calm!


After Monday and Tuesday even the calendar says WTF...
User currently offlineACEregular From United Kingdom, joined Aug 2003, 676 posts, RR: 1
Reply 2, posted (10 years 8 months 3 weeks 6 days 1 hour ago) and read 2438 times:

Bear in mind that B737's do not have doors covering the wheel well which is situated beneath the overwing exit rows. As the aircraft climbs and moves forward at the same time, the angle of the wheel well will be causing a little drag with the air rushing past. in the latter stages of climb out the angle of climb is greatly reduced and the airflow will flow parallel to the belly of the fuselage.

User currently offlineWilco From United States of America, joined Mar 2004, 355 posts, RR: 1
Reply 3, posted (10 years 8 months 3 weeks 6 days 1 hour ago) and read 2384 times:

well said ACE. Its sort of like blowing on the top of a bottle....


"Ever seen a grown man naked?"
User currently offlineACEregular From United Kingdom, joined Aug 2003, 676 posts, RR: 1
Reply 4, posted (10 years 8 months 3 weeks 6 days 1 hour ago) and read 2340 times:

Exactly. I couldnt really put a technical slant on it, however I work on 737's and I am quite familiar with them.

Cheers wilco - Respect.


User currently offlineVs744 From United Kingdom, joined Aug 2001, 677 posts, RR: 1
Reply 5, posted (10 years 8 months 3 weeks 6 days 1 hour ago) and read 2328 times:

thanks ACE, but this was definately not noise caused by drag, this was certainly mechanical. The best way to describe the sound is as a petrol generator, but with a lot of unatural vibration. I've flown on dozens of 737's of all varients, and never experienced this.





User currently offlineACEregular From United Kingdom, joined Aug 2003, 676 posts, RR: 1
Reply 6, posted (10 years 8 months 3 weeks 6 days ago) and read 2235 times:

G-BZZJ was delivered new to Continental in December 1995, so its not a really old one. EZY,FR and WW all use 300's some of which are from 87/89. I can only account for the vibration as I mentioned before. However it may well be that the aircraft had a problem with the hydraulic actuators, maybe they were not shutting down after effecting a command.

User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 7, posted (10 years 8 months 3 weeks 4 days 21 hours ago) and read 1934 times:

If I had to bet I'd say a gear door might be a little less than tight. The hydraulics are cut off to the gear when the handle is placed to neutral and if there was a problem where they couldn't put the handle to off the correct action is to return to the airport. There's the danger of a leak of unknown severity so they wouldn't continue the flight.
Go with the door out of fair and loose. It makes sense. Especially on the classic 737's with the composite panels. Remember, what's loud to you in the middle of the plane probably can't be heard in the cockpit, (excuse me, control compartment).

[Edited 2004-03-08 22:51:59]


One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
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