B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Less Severe
Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; General Maintenance Action
Aircraft
On climb out through 11;000 feet; the # 2 engine driven hydraulic pump low pressure light illuminated and the B hydraulic system quantity quickly decreased to 45%; then continued to decrease very slowly. We requested clearance back to the departure airport. Per QRH for the low press light; we turned off the #2 engine hydraulic pump. No other lights or indications. Since we still had normal pressure and quantity was pretty stable; and we were by that time on final approach; we configured the aircraft for a flaps 30 landing. Normal landing; rollout; and taxi in followed.
During climbout; leaving 15;000 feet; noticed depleting system B hydraulic quantity followed quickly by the system B engine driven pump hydraulic low pressure light. QRH completed; #2 engine; engine hydraulic pump moved to off. System B hydraulic quantity stabilized at approximately 45%. We requested return. With stable quantity we determined we did not have a total system B loss and elected to request a final such that we could configure and monitor. Quantity stable when fully configured as was pressure. Landed with normal rollout. Cause of the event was a partial loss of system B hydraulic quantity which precipitated the engine driven pump low pressure indication.
B737 flight crew notices depleting system B hydraulic quantity followed quickly by the system B engine driven pump hydraulic low pressure light during climb out. The engine driven pump is turned off and the flight returns to the departure airport for a normal landing.