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Old 14th May 2013 | 04:45
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nitpicker330
 
Joined: Jun 2009
Posts: 2,167
Likes: 2
From: Australia
The A330 with the APU running can offload excess bleed air, it makes a screaming whining noise when it does and it goes up and down in volume. It's worse with the APU bleed selected off ( naturally )
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