Boeing777 strange sound from engines shortly after takeoff

Hey was recording when I heard the engines louder then I've ever heard them before.. what caused this strained/grinding sound??

Category:

Science & Technology

Tags:

• Boeing
• 777
• jet
• engines
• engine
• problems

[splatty123]

hi i am training to be a pilot with BA and i heard that sound when i was on my tutorial flight. where you sit and watch everything to do. i didnt no what it was so i asked and he said it was the vibrations form the pressure being released that causes it.

[spicedclay]

interesting... as you see from the other comments, there are so many different answers. I remember it was not full throttle, they were pulling the engiens back around 1 min after take off when it happened.. and you hear at the start of the video how smooth it sounded till all of a sudden aarrrrrrrrrrlrllrlrlrl.. LOL

[Boeing747fan]

Like 777cpt said, this is perfectly normal. In fact it would be abnormal without this sound. The source of the noise is the big fans in the front of the engines; the fan blade tips going supersonic makes this sound.

[spicedclay]

Thanks.. I've flown a lot (usually on the 76) and it was the first time hearing that as loud as it was. Also what's making the noise, I feel there would be less noise, if you are pulling the power back.

[jamedorr]

I am an engineer for Boeing, helping design the 787. The sound is normal for high bypass turbofans. The tips of the fan of the engine exceed the speed of sound at higher throttle settings. The buzzsaw sound is from a rapid series of sonic booms that you hear coming from the front of the engine. Further back in the airplane, it is not as noticable, and it goes away at lower engine speeds.

[ChevyfunSS]

Wow Jamedorr..so cool you are working on the 787. Good luck with that, can't wait to see that plane out in the flying world. Neat job you got there

[SPNWnewswire]

@splatty123 That sounds incorrect if it is not related to "sonic booms" being sucked back into the engine at high throttle. Sometimes people sitting (particularly in the position where the poster was) near the engines report this, at other times it is hardly noticeable to passengers. It likely has to do with atmospheric conditions at the time of flight as air consistency changes throughout the day and throughout the year. Have noticed this more often during cool/cold, damp conditions.

[mobilemonkey625]

sounds like my sisters hairdryer on full blast...

[airnicholai]

Those my friend are rolls Royce Trent 850 engines. The grinding u r hearing is one of my favorite sounds. The buzz saw noise is music to my ears. You hear it on take off when then engine powers up. The buzz saw sound is caused when the fan blades break the sound barrier over and over and the whining sound is from the sound trying to escape the front of the engine but gets sucked back in. Cool stuff. Its normal mate!

[AirCanadaA55555A]

Next Time Go On A General Electric GE90 Powered Boeing 777.

[AirCanadaA55555A]

@spicedclay This is a Rolls Royce Trent 800 powered Boeing 777 so it has an awful grinding sound when pilots get to 600ft.

[JA8589]

Yep, the sound is perfectly normal. The engines in this video, however, are RR Trent 800s, not a pair of GE90s.

[jamedorr]

Thanks, it is a really cool job. It makes you realize why airplanes are so safe, we spend tons of time analyzing and designing even the smallest parts (of course that is why they are so expensive too). Its always nice to know people will enjoy flying in something I helped design. It is a really beautiful airplane in person, can't wait to fly on it myself.

[Tampaslice]

The sound is perfectly normal. It's the GE-90 engines throttling back from take off setting to climb setting of 94%. I love these engines, I've never had 100% confidence in any engine but the GE-90's allow us pilots that fly with them to never worry about their reliability. We know when we need them they'll perform flawlessly.

[FLIGHTCOMPANY]

Those fan blades are at full rotation speeds

[encinitasmel]

Probably your seat location made it sound a little louder but it is the normal sound of most High Bypass jet engines at climb power ... There is no strain, most take offs in B777's are performed at derated thrust and climb power is an even lower setting .. that's what you heard. Remember this aircraft can climb out, fly around and return on one engine if need be...

mel

[iqbal172]

normal mate trust me, check out all my 777 take off vids, its just the engine throttling down to climb thrust rating

[sealalula]

it could be the windy weather and pressure from the surroundings to cause this noise from the engine :D

[hairyfatslobpig]

My friend is a Boeing mechanic..all these GE engine have to be replaced. The rear assembly comes loose so they are carefully inspected prior to scheduling a change.

[xenugears]

that engine is straight truckin

[deddles]

that is perfectly normal. its because the fan blades are spinning so fast due to the heavy strain on the engines from takeoff. remember take off is the most dangerous part of the flight.

[BrummieNeil89]

ITS NORMAL!!!!!

[windsorbays]

I have heard this before but I was on a 757 on take-off and ascent. It wasnt very nice because you dont hear it often so people were looking around the cabin for reassurance!! LOL

[chaucibai2]

reduce to climb thrust, all the planes do that.

[iceflyevents]

Its pratt and whitney engines by the sound of it

[iceflyevents]

Its pratt and whitney engines by the sound of it

[maxou5757]

Totally normal ... awesome sound :)