Narrative:

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 hydraulic 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 hydraulic 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 operations/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.

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Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.