On the ECAM display, which hydraulic system is not available for operation of the Flight Controls?

On the ECAM display, which hydraulic system is not available for operation of the Flight Controls?

• A. Blue system
• B. Yellow system
• C. Green system
• D. Orange system

Answer: (C)

In the A320, flight controls are driven by hydraulic power from two independent circuits to ensure control even if one system fails. The Green hydraulic system does not feed the primary flight-control actuators; it powers other hydraulic functions such as tailplane trim and various secondary actuators. Therefore, when Green is not available for flight-control actuation, the ECAM will indicate that this system cannot operate the flight controls, while Blue and Yellow remain capable of moving the primary surfaces. The Orange system isn’t used for flight-control actuation on this aircraft, so it isn’t part of the normal flight-control power path.

In the A320, flight controls are driven by hydraulic power from two independent circuits to ensure control even if one system fails. The Green hydraulic system does not feed the primary flight-control actuators; it powers other hydraulic functions such as tailplane trim and various secondary actuators. Therefore, when Green is not available for flight-control actuation, the ECAM will indicate that this system cannot operate the flight controls, while Blue and Yellow remain capable of moving the primary surfaces. The Orange system isn’t used for flight-control actuation on this aircraft, so it isn’t part of the normal flight-control power path.