B767-300 and 300 ER
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe
Flight Crew Diverted; Flight Crew Landed As Precaution; General Maintenance Action
Aircraft
[Enroute] we got L HYD QTY alert. We observed left hydraulic fluid quantity continually and steadily decrease from 0.70 to 0.0. When quantity went to zero; we got a L HYD PRIM PUMP alert; with PRESS light on left engine hydraulic pump; with left QTY light on overhead panel. Complied with QRH for left hydraulic quantity and Left Hydraulic Primary Pump procedures. Engine driven pump was secured. Left hydraulic pressure remained at 3000 +/- 100 PSI. Left hydraulic electric pump remained in AUTO. [We advised] Center; and a normal visual approach was conducted. Configuration to flaps 30; approach; rollout; and clearing runway were all normal. Fire/Rescue looked over aircraft from their vehicles and found no irregularities. Captain elected to taxi in without escort. Taxi to parking was normal. All hydraulic systems performed normally to block in. Left system hydraulic quantity depleted to zero. Maintenance verified left hydraulic reservoir empty. No suggestions. This aircraft has approximately 2500 TTSN (Total Time Since New). I wouldn't expect any hydraulic components to fail at this point in the airframe life.
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B767-300 flight crew reported diverting following loss of the left hydraulic system.