A320
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Diverted; Flight Crew Landed As Precaution; General Maintenance Action
Aircraft; Procedure
When we checked in for our morning departure; we were advised the aircraft was being towed into the gate due to a maintenance issue. When the aircraft finally arrived at the gate; Maintenance advised us a line on the Green Hydraulic System had failed and it would be over five hours before the aircraft would be repaired. We finally pushed; and had a normal departure. After reaching cruise and upon performing a HEFOE (Hydraulic Electrical Fuel Oxygen Engine) check; we noticed the green system quantity was somewhat lower than normal. As we proceeded westbound; it was apparent the quantity indicator was indeed decreasing. We notified Maintenance of the condition and asked if we could turn off the green system pump thinking that maybe the suspected leak would decrease in intensity; but was told to abide by the QRH procedures. By this time we had already reviewed the QRH; and had not found any procedure for our situation. When the quantity indicator was within 1/8 inch of the amber low level line; we asked Dispatch if maybe a diversion would be appropriate. They concurred; so we told Center we were going to divert for a precautionary landing. Apparently someone declared an emergency for us as the equipment met us upon landing and followed us to the gate. Maintenance was still troubleshooting the situation when we left the airport.
A320 Captain reports departing late due to a maintenance required repair of the Green hydraulic system. Once in cruise the Green system quantity is found to be decreasing and the crew elects to divert.