yeah it is quiet. That big box in the centre is an external hydraulic pump. If I'm not wrong, the aircraft's electric pump that is usually used during maintenance with the engines off is not strong enough to retract the landing gear, even though it supplies 3000PSI. I might be wrong though. Ohh btw, the landing gear can be deployed using gravity too ;)
@pierredz you are right , the yellow elec pump is too weak for extraction and retraction of landing gear. In this case an external hydraulic rig is connected which itself is an independent hydraulic system which pumps in hyd fluid at sys press and is returned back as well. If I am not wrong , the ext rig is connected to the GREEN sys servicing panel.
Also its not a gravity extension , if it were then wheel doors would have remained open but in this case it closes because there is pressure.
Thats an extension test, not a retraction
gerry626 8 months ago
cooool where is that!
nadanada123 2 years ago
Quiet and fast
pottu200 3 years ago 3
Any Video of the Retraction.
HAWK21M 4 years ago
yeah it is quiet. That big box in the centre is an external hydraulic pump. If I'm not wrong, the aircraft's electric pump that is usually used during maintenance with the engines off is not strong enough to retract the landing gear, even though it supplies 3000PSI. I might be wrong though. Ohh btw, the landing gear can be deployed using gravity too ;)
pierredz 5 years ago
@pierredz you are right , the yellow elec pump is too weak for extraction and retraction of landing gear. In this case an external hydraulic rig is connected which itself is an independent hydraulic system which pumps in hyd fluid at sys press and is returned back as well. If I am not wrong , the ext rig is connected to the GREEN sys servicing panel.
Also its not a gravity extension , if it were then wheel doors would have remained open but in this case it closes because there is pressure.
menonarjun7 9 months ago
wow thats so quiet
FFFreddy01 5 years ago
It sure isn't quiet in flight. Sounds like a a car hitting a steal garage door :)
RobertGary1 4 years ago 2