A319
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Situational Awareness
Aircraft Equipment Problem Critical; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Landed in Emergency Condition
Aircraft
During cruise at FL320 ECAM showed HYD Y sys lo and quantity indicated zero. Accomplished ECAM actions IAW (In Accordance With) checklists and advised Dispatch and Maintenance Control. Elected to continue to ZZZ. During descent on autopilot; aircraft abruptly pitched down; autopilot disconnected; and ECAM momentarily showed HYD B + Y sys lo pr. [We] recovered [the] aircraft from pitch down and [requested priority handling with ATC]. The ECAM HYD B 'self healed' and disappeared from [the] ECAM display. We used the 7700 ACARS feature to notify Dispatch. Apparently; it did not work according to our Dispatcher. Accomplished non-routine landing considerations checklist; coordinating with cabin crew and ATC. Did not re-engage autopilot for the remainder of the flight and hand flew the approach. There is a discrepancy between ECAM and the manual on turning on Y sys engine pump during approach. We chose the ECAM guidance and turned on the pump after configuring. We expected only one reverse on rollout; but had indications of normal reverse on both engines. Taxied to gate with CFR (Crash Fire Rescue) following. Terminated [priority handling] with ground after shutdown. On post flight; FO (First Officer) found fluid covering the bottom of the airplane; in the left wheel well; and on the left main landing gear. During the van ride to our layover hotel; the FAs (Flight Attendant) told us a burning mechanical smell in mid cabin occurred soon after the pitch down.
A319 Pilot Flying reported loss of hydraulic fluid and subsequent pitching down of aircraft.