A300
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance
Air Traffic Control Provided Assistance; Flight Crew Overcame Equipment Problem; Flight Crew Returned To Departure Airport; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Procedure
On initial climb out lost #2 yaw damper followed soon thereafter by a Yellow Pump Lo Press ECAM (Electronic Central Aircraft Monitor). System pressure fluctuated several times from zero to normal; 3000 psi; and finally remained normal throughout approach and landing. Based on prior Yellow system intermittent pressure issues compounded by having Yellow Pump Depressurization Function deferred; elected to return to ZZZ. No [priority handling] declared since system returned to normal pressure. Intermittent hydraulic system failure.
Immediately upon takeoff from ZZZ received ECAM for Yellow HYD (Hydraulic) Press Low. Right ECAM showed pressure falling on Yellow system to 0 psi; pressure then began to climb back up and stabilized at 3050 psi. This same sequence happened 3 times in an approximately 2 min window. Due to history with the Yellow HYD system on the previous day ZZZ1-ZZZ leg; we elected to return to ZZZ to have maintenance look at the system.Intermittent failure of the Yellow HYD pump.
A300 flight crew reported intermittent loss of yellow hydraulic system and yaw damper.