B757-200
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 125; Flight Crew Total 20000; Flight Crew Type 12000
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Fuel Issue
Air Traffic Control Provided Assistance; Flight Crew Landed in Emergency Condition; Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Departure Airport; General Maintenance Action; General Flight Cancelled / Delayed
Aircraft
Approximately at 6;000 feet; the 'L HYD Quantity' message and light illuminated. Shortly after we received the 'L HYD RES/PRESS' message and light. We requested priority handling and leveled off at 7;000 feet. While returning to the outer marker of our departure runway to hold we began performing the QRH checklist for the loss of the Left Hydraulic System. After determining we loss only the Left Hydraulic System but; the aircraft was safe to fly; we contacted Operations Control and Maintenance Control. The aircraft was overweight and required a significant fuel burn off to land below the Structural Landing Weight of the aircraft. Maintenance Control; Operations Control and the crew determined together that landing at ZZZZ was the safer course of action based on many factors. We received a release to divert to ZZZZ and continue to hold for another :45 minutes to finish the fuel burn required to land below the structure landing weight. The landing was uneventful and the runway was closed for around twenty minutes. Fire rescue gave the all clear and the aircraft was towed from the runway to the gate. Maintenance found two hydraulic leaks; one hydraulic flex line in the left gear well and the other leak was from left engine hydraulic pump.
B757-200 Captain reported loss of Left Hydraulic System quantity and pressure resulted in a diversion and hold to burn off fuel; followed by a precautionary landing.