Which of the two hydraulic systems, Yellow and Blue, is generally used on ground? Give your reasons for that.

Which of the two hydraulic systems, Yellow  and Blue, is generally used on ground? Give  your reasons for that.
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1 Answer

Answer :

Normally the yellow hydraulic system used.  Firstly because, if at any point, if we require the  green system to be pressurized for operation of  some component, we can pressurize it with the  yellow hydraulic system through the PTU  (Power Transfer Unit). However, blue system is  not connected to the PTU and hence we won’t  be able to pressurize the green system if  required.
Another reason may be that if cargo doors are  to be operated for any maintenance action, we  need yellow hydraulic system to be pressurized.  Blue system is not available for cargo door  operation.
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