PPRuNe Forums - View Single Post - What are the thuds you hear on take-off?

19th May 2005, 09:28

#6 (permalink)

FlightDetent

Only half a speed-brake

Join Date: Apr 2003

Location: Commuting not home

Age: 46

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I've been told it is the hydraulic PTU test in progress as the second engine gets started (narrowbody). However from the cabin sidem it seemed to take much longer...