A319 flight crew reported a hydraulic system temperature malfunction during climb. As the crew returned to the departure airport the malfunction cleared; and the flight landed and taxied to the gate.
Synopsis
A319 flight crew reported a hydraulic system temperature malfunction during climb. As the crew returned to the departure airport the malfunction cleared; and the flight landed and taxied to the gate.
Narrative
Climbing through approximately 27000 feet we got hyd green reservoir overheat ecam. The ecam called to turn off the green eng pump and Power Transfer Unit. FO took the airplane and leveled at 290; while I raised dispatch. He conferenced in Maintenance Control; we discussed the situation; and with ecam system page and push button on overhead indicating the overheat situation still existing; we decided to return to ZZZ; for longer runways; weather; maintenance etc. While on the radio; the overhead push button fault light extinguished; but on the hydraulic system page the overheat still indicated. Maintenance Control agreed the overheat ecam had to be considered valid and procedure complied with if it showed overheat on the system page. After ending the radio call; I briefed up the fo on our analysis and he briefed me on the flight status. I called atc and advised we would return to ZZZ and [requested priority handling]; due to the green hydraulic system being inop and if unable to recover it; would involve manual gear extension; yellow brakes only; and no nose wheel steering. We received vectors and clearance back to ZZZ. I then briefed/test the fa on the situation; and briefed and explained everything to the passengers. On the descent via the ZZZZZ arrival to ZZZ; the hyd system page stopped indicating the overheat. The fm non normal guidance has you turn the system back on when the overheat indications clear. The fo and I discussed and decided we would wait till no more than 15 minutes from landing to turn it back on in case it overheated again. We turned the green engine pump on and power transfer unit switch on while on base leg vector for the rnav y to XXR. Green hyd system pressure restored; and we landed with normal gear extension; braking and nose wheel steering. The system did not overheat again; so we taxied under our own power as normal to gate XXX. After deplaning I debriefed with Mx; the fa's; Chief Pilot and dispatch.
Second reporter narrative
[Requested priority handling] after green hyd resevoir ovht ecam. Occurred during climb phase. ZZZ1 to ZZZ was uneventful. CA called dispatch and Chief Pilot to confer resolution. Ovrht remained on status page; but it went away during last 15-30 min of descent/approach. Switches returned to normal during approach and restored system. No unusual anomalies thereafter; taxied back to ramp.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.