Thanks for the feedback.
tdracer wrote:
Boeing doesn't use a clutch, it uses a servo valve to 'depressurize' the EDP such that the EDP isn't involved in the associated hydraulic system and is basically just free-wheeling.
Both Boeing and Airbus use the EDP solenoid valve to pressurize or depressurize the hydraulic system. On recent aircraft Airbus use the clutch as extra feature because it provides more benefits (for example disconnect the EDP from the gearbox in flight because of certain problems. This feature (the clutch) is provided only on recent aircraft (spannersatcx mentioned A350 using the AMM as evidence and may be on A380, I hope someone can confirm it on A380). That's why I am wondering why Boeing is not using the clutch in the EDP (Airbus own patent clutch or other reasons ?)?
The EDP solenoid valve is part of the pump and it is made by the EDP manufacturer (supplier/vendor) and not by Boeing or Airbus.