its the electric hydraulic pump operating to pressurize the hydraulic systems due to taxing with only one engine on :) the second engine (Eng. No 1) is started later due to the long taxi times at schipol to save fuel. After the engine driven hydraulic pump of Eng. 1 is active, the electric pump stops operating as the pressure is enough.
![A320neo BRAND NEW 2nd of Lufthansa: Startup, Taxi and stunning Take Off D-AINB! [AirClips]](http://i.ytimg.com/vi/XfhQu7GEQZM/mqdefault.jpg)
Love that long high pitch sound! A320 family is magnific!
another good film , love the "barking dog"
thanks glad you liked it :) I found it a bit weird at first but now its quite cool!
1:57
Music to my ears!
Super Video 😊😊
2:13 what’s that noise
Thanks for the amazing video 😊😊
Not everyday you see the flaps go down during pushback
power "transfer" unit is not used for single engine operations, it is a simple pump that transfers pressure
EEZY JETT
what is that loud high pitch noise?
its the electric hydraulic pump operating to pressurize the hydraulic systems due to taxing with only one engine on :) the second engine (Eng. No 1) is started later due to the long taxi times at schipol to save fuel. After the engine driven hydraulic pump of Eng. 1 is active, the electric pump stops operating as the pressure is enough.
Ha ha this video is 7:37 long