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Noise On 757 Take-off  
User currently offlineUsAirways16bwi From United States of America, joined May 2004, 1004 posts, RR: 4
Posted (9 years 1 month 2 weeks 1 day 8 hours ago) and read 3631 times:

Everytime I fly on a 757, there is a loud bump just as the plane lifts off the ground...it sounds like its coming from the main gear, or somewhere underneath the plane. Anyone know what it is?

9 replies: All unread, jump to last
 
User currently offlineAJ From Australia, joined Nov 1999, 2395 posts, RR: 24
Reply 1, posted (9 years 1 month 2 weeks 1 day 8 hours ago) and read 3625 times:

Probably just the oleos fully extending and the bogeys tilting on the main gear.

User currently offline320tech From Turks and Caicos Islands, joined May 2004, 491 posts, RR: 5
Reply 2, posted (9 years 1 month 2 weeks 1 day 8 hours ago) and read 3625 times:

Not having had the privilege of having flown on a 757, I can only surmise that it's the bogies dropping into the retraction position (ie, leading wheels up).


The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.
User currently offlineMX757 From United States of America, joined Aug 2005, 628 posts, RR: 12
Reply 3, posted (9 years 1 month 2 weeks 1 day 8 hours ago) and read 3621 times:

After rotation the main gear shock struts go to full extend. And the forward part the truck-the front axle with the front wheels on it- tilts up. That could be the "bump" you are hearing.


Is it broke...? Yeah I'll fix it.
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 4, posted (9 years 1 month 2 weeks 21 hours ago) and read 3540 times:


View Large View Medium
Click here for bigger photo!

Photo © Miguel Cláudio


Def the Bogies Dropping to the Tilted position & Extension of the Oleos.
regds
MEL



Think of the brighter side!
User currently offlineDl757md From United States of America, joined May 2004, 1562 posts, RR: 17
Reply 5, posted (9 years 1 month 2 weeks 17 hours ago) and read 3478 times:

I concur with the explanations above. The truck tilt actuator has 3000psi hydraulic fluid acting on it and it pretty severly rams the truck to it's tilt position against the stops. When the truck hits those stops that hard it's going to make a pretty loud thump. No problems though as they where designed for this.

Dl757Md



757 Most beautiful airliner in the sky!
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 6, posted (9 years 1 month 2 weeks 9 hours ago) and read 3408 times:

Quoting Dl757md (Reply 5):
The truck tilt actuator

Any Close up Photos on this Actuator.
regds
MEL



Think of the brighter side!
User currently offlineGARPD From UK - Scotland, joined Aug 2005, 2686 posts, RR: 4
Reply 7, posted (9 years 1 month 1 week 6 days 22 hours ago) and read 3353 times:

Hmm, I've never actually noticed such a noise in my several 757 flights.

I'm generaly more tuned into listening to the fabulous sound of the RB211s on take off power.... ooo baby  Wink



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User currently offlineTinPusher007 From United States of America, joined Feb 2005, 977 posts, RR: 1
Reply 8, posted (9 years 1 month 1 week 6 days 17 hours ago) and read 3310 times:

Quoting GARPD (Reply 7):
I'm generaly more tuned into listening to the fabulous sound of the RB211s on take off power.... ooo baby

I concur....but I also love the sound of those bogeys slamming into place after rotation...sounds powerful.



"Flying isn't inherently dangerous...but very unforgiving of carelessness, incapacity or neglect."
User currently offlineKhenleyDIA From Sweden, joined Feb 2005, 427 posts, RR: 0
Reply 9, posted (9 years 1 month 1 week 19 hours ago) and read 3095 times:

From what I have noticed, if you listen for it, you will hear that on most major commercial airplanes. Maybe I should say, anything larger then a 737 or A320.

KhenleyDIA



Why sit at home and do nothing when you can travel the world.
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