How does the recommended 54 series HPU work with the RAT on Challenger 850?

The aircraft itself only needs the 54 series. If the operator is going to be doing RAT tests, then they will need the larger HPU. Not all customers perform the RAT test. Also keep in mind that when the RAT test is being performed, the 56 series is not connected to the aircraft. It is connected to the RAT motor, and it never touches the aircrafts hydraulic system.


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