Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe
Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; General Maintenance Action
Aircraft; Procedure
Previous maintenance log had an event where the aircrew had a Number 2 engine driven hydraulic low pressure light illuminate on departure and returned. We inherited this aircraft the next day after maintenance had been performed on the aircraft overnight. Maintenance had found a broken clamp that was blamed on chaffing the hydraulic line in question. It was fixed per the maintenance log with a periodic inspection requirement. We did a normal preflight and pre departure duties. We also met with maintenance personnel and they explained the situation and maintenance performed overnight. Push; engine start; taxi; and takeoff were normal. In the mid 20 thousands on climb out; we got a master caution with a HYD cue. Looked at the overhead panel and saw a Low pressure light in the Number 2 hydraulic engine driven pump. The 'B' hydraulic system quantity was decreasing as well. Ran the HYD Low pressure checklist and turned the Number 2 engine driven pump off per the checklist. Once the pump was turned off; the quantity in the 'B' system stabilized at 39 percent. This was expected with a leak in the Number 2 engine driven pump as the standpipe would 'preserve' approximately 40 percent of the fluid. No low pressure light displayed in the Number 2 electric hydraulic pump. End of checklist. Called OPS/Maintenance to advise of situation and they put us through to Maintenance Control and Dispatch. We were then directed to return. Return and landing was uneventful. We did not [think this was] an Emergency due to we had the 'B' system with the electric pump supplying the pressure and did not require any further abnormal procedures.
B737 First Officer experiences a master caution with a low pressure light in the Number 2 hydraulic engine driven pump during climbout. The engine driven pump is turned off and the flight returned to the departure airport for a normal landing. The identical failure occurred the day prior and was repaired by maintenance.