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winterlight
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G-VIIN Engine Noise

Thu Apr 02, 2015 8:27 pm

Can always tell when this particular BA 772 is on approach by the whining noise it makes. Much more pronounced than the usual GE90 noise. Anyone know why?
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winterlight
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RE: G-VIIN Engine Noise

Mon May 18, 2015 8:29 am

Still making this racket on arrival and departure.
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OceanATC
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RE: G-VIIN Engine Noise

Tue May 19, 2015 4:26 am

This noise?

https://m.youtube.com/watch?v=abwbe4-CoBI

It is quite odd.
 
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winterlight
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RE: G-VIIN Engine Noise

Tue May 19, 2015 1:10 pm

That's it, but I've heard it worse than that. Can't be anything majorly wrong as it's back and forth everyday. Unless BA have not spotted it?
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Sinlock
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RE: G-VIIN Engine Noise

Thu May 21, 2015 11:15 am

Sounds like she has a Pilatus PC-12 stuck in one of here engines.

With the extent of the 777's health monitoring systems I'm sure it's a known issue. As for what it is I couldn't guess.
I do know that sometimes that the anti-abrasion coating that is used on some types of larger size antenna's (VHF and Wi-Fi) can cause some interesting sounds when it fails. But as far as I know it's doesn't sound like whats on that 777, the "Tape" has a much lower Hz cycle and has more of a poping sound like a small flag in a high wind.
 
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garpd
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RE: G-VIIN Engine Noise

Fri May 22, 2015 6:56 am

Sounds like something flapping or vibrating at high frequency somewhere around the aft end of the engine?
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winterlight
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RE: G-VIIN Engine Noise

Sun May 31, 2015 4:19 pm

Seems a tired APU is responsible for the noise, according to a BA engineer.
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trex8
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RE: G-VIIN Engine Noise

Mon Jun 01, 2015 1:35 am

Quoting winterlight (Reply 6):
Seems a tired APU is responsible for the noise, according to a BA engineer.

The APU is on for landings?????
 
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garpd
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RE: G-VIIN Engine Noise

Mon Jun 01, 2015 8:24 am

Quoting trex8 (Reply 7):
The APU is on for landings?????

I think SOP for BA is to turn the APU on during the approach.
Some airlines have it started post landing, some before.
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winterlight
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RE: G-VIIN Engine Noise

Thu Jun 04, 2015 11:09 am

Well, she's just left as BA9170. Not gone to Cardiff though.

[Edited 2015-06-04 04:12:39]
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AA737-823
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RE: G-VIIN Engine Noise

Fri Jun 05, 2015 4:29 am

It's definitely not the APU.
The pitch of the noise changes with changes in engine power setting.
It's quite discernably engine related.
 
rta
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RE: G-VIIN Engine Noise

Fri Jun 05, 2015 5:43 am

Quoting winterlight (Reply 9):

Well, she's just left as BA9170. Not gone to Cardiff though.

LHR-LGW to operate LGW-BDA and the return. It should head back to LHR as it is scheduled to fly to JFK.
 
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Jetlagged
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RE: G-VIIN Engine Noise

Sun Jun 07, 2015 10:09 pm

Quoting AA737-823 (Reply 10):
It's definitely not the APU.
The pitch of the noise changes with changes in engine power setting.
It's quite discernably engine related.

The step change in frequency coincides with the aircraft passing the camera position so it could easily be the Doppler Effect. The aircraft looks too high at that point for it to be power reduction during flare.

If a BA source says it's the APU then it probably is.
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