A319
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Confusion; Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Landed in Emergency Condition; General Maintenance Action
Aircraft
During a cruise check we noticed the green hydraulic system quantity was low but the indication was green. Shortly after the indication was even lower and amber. I made an AML entry to ensure the quantity was serviced and sent a message to dispatch (could not find an appropriate arms code). We were starting to descend now and began getting an ECAM caution for low green system quantity. This caution appeared for approximately one second then disappeared 12-15 times. The caution then stayed on long enough to complete the ECAM procedure; which turns off all pumps to the green system. Green system pressure remained normal (3000 psi). The green system pressure dropped to zero and returned to normal 3-4 times before landing. As we were configuring to land green system pressure was normal. We decided to continue with the original ECAM procedure which calls for gravity landing gear extension and no nose-wheel steering because the pressure might drop to zero at any moment. I landed the airplane and had enough control to clear the runway and stop. We were towed to the gate. During descent and approach we [requested priority handling]; coordinated with ZZZ Operations and Maintenance for a tow; briefed the flight attendants for a precautionary landing and completed multiple landing assessments; checklists; ECAM procedures; etc. We were told the next day; by a mechanic; that the aircraft had a hydraulic fluid leak.
A319 Captain reported a loss of green hydraulic system quantity; as well as erratic readings through approach and landing sequences.