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Old 26th October 2007 | 07:29
  #7 (permalink)  
sabenaboy
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From: EASA territory
Later, on the plane (AF A320), I experienced it myself. It made an AWEFULL sound
and most passengers - not knowing - thought something was wrong with the plane.
The sound WAS coming from the A/C, but it's completely normal on an A320. (It sounds like a terminally sick, barking dog)
What you heard was probably the PTU (hydraulic power transfer unit) which comes into action when only one engine is on. During this kind of operation, one engine is started before the push and the second one after the push.
More info here (Check out reply 5)

Regards,
Sabenaboy
Last edited by sabenaboy; 26th October 2007 at 08:12.
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