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Bankrupt84
17th May 2018, 18:16
Sometimes when turning packs on the ground (running off APU), the pack begins surging.

does anyone have an explanation for why this would occur?

thanks!
Skyjob
17th May 2018, 21:46
Aircraft type?
Bankrupt84
18th May 2018, 03:15
E145.
It only occurs on occasions.