Narrative:

Captain [training] being conducted. [Check pilot] acting as first officer; pilot monitoring. Leg 2 of transition captain [training]; qualifying captain previous equipment B756. First [training] trip on B737. Following uneventful preflight-taxi phases of flight; takeoff initiated with reduced thrust to; flaps 5. Takeoff thrust set to 89.0% N1 reduced; AC gw 136.5. Todm tow 136.9. Moments after liftoff with positive rate of climb; pilot flying called for gear up. Simultaneously with gear retraction; steady hydraulic noted on system annunciator. #2 engine hydraulic low pressure noted/confirmed by pilot monitoring on overhead. Normal climb profile accomplished. Climbing through approximately 1;000 ft afe; pilot flying confirmed overhead low pressure engine hydraulic #2 illuminated. Master caution reset. Normal after takeoff checklist accomplished. Pilot flying/pilot monitoring duties and objectives clarified with respect to managing the system non-normal. ATC clearance received initially for vectors with subsequent clearance to btg to hold at 9000 ft. Hydraulic pump low pressure QRH procedure accomplished enroute to holding fix at btg. Fuel on board entering the hold at btg approximately 14.5. Hydraulic system B qty normal; elec 1 B side pump operating normally. In the hold; as we had anticipated; B system hydraulic experienced a total quantity loss. This occurred after 1-2 turns and following initial notification to dispatch. Dispatch notified of total system B hydraulic loss and intent to [advise ATC] with a return to ZZZ. Flight attendant test brief accomplished in accordance with SOP; no planned evacuation but anticipated crash fire rescue equipment inspecting aircraft on runway after landing. PA accomplished with relevant information. QRH loss of system B hydraulic accomplished. [Advised ATC] with request for vectors to ILS xxr. ZZZ ATIS X; 800 ovc; 10 miles; wind calm. Prior to departing the hold; I discussed all aspects of our actual and planned course of action; recommendations; possible omissions and any remaining considerations with my qualifying oe captain. We elected to switch roles as this would be the qualifying captain's first B737 landing in several years. I assumed the pilot flying role; briefed the approach and GA to include configuration points for alternate flap extension and after landing considerations. QRH loss of system B procedure reviewed by the pilot monitoring; deferred items accomplished. Hold fix departed for downwind vectors runway xxr ZZZ. Flaps extended to 5 on downwind. Gear extended at initial GS case break; flaps selected to 15 at 1 1/2 dots below GS. Final stable configuration achieved by 1;400 [feet] afe. Runway acquired visually at 800 afe; uneventful landing accomplished with manual braking. Aircraft control transferred on centerline below 80 knots. Crash fire rescue equipment coordinated for exterior inspection of aircraft. Minimal manual breaking required during rollout; brake temperature was not suspected to be out of normal range. No exterior damage noted. We requested crash fire rescue equipment to follow aircraft to gate. Flight attendant status verified; cabin secure prior to taxi. PA accomplished prior to aircraft movement. Uneventful taxi to gate. Operations; gate and customer coordination accomplished with ZZZ operations. [Chief pilot]; dispatch; [maintenance control] contacted. Elb noted and entered via ACARS. Gate fuel at block in 11.4. Aircraft out of service for maintenance action/repair. ZZZ mx noted #2 engine driven hydraulic pump had failed with internal damage to the pump and system components.

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Original NASA ASRS Text

Title: B737 Captain reported on take off; the #2 Engine Driven Hydraulic Pump failed; causing the loss of B system; resulting in an air turn back and precautionary landing.

Narrative: Captain [training] being conducted. [Check Pilot] acting as First Officer; Pilot Monitoring. Leg 2 of transition Captain [training]; qualifying Captain previous equipment B756. First [training] trip on B737. Following uneventful Preflight-Taxi phases of flight; Takeoff initiated with Reduced Thrust TO; Flaps 5. Takeoff Thrust set to 89.0% N1 Reduced; AC GW 136.5. TODM TOW 136.9. Moments after liftoff with positive rate of climb; Pilot Flying called for gear up. Simultaneously with gear retraction; steady HYD noted on System Annunciator. #2 ENG HYD LOW PRESSURE noted/confirmed by Pilot Monitoring on overhead. Normal Climb profile accomplished. Climbing through approximately 1;000 ft AFE; Pilot Flying confirmed overhead LOW PRESSURE Engine Hydraulic #2 illuminated. Master Caution reset. Normal After Takeoff Checklist accomplished. Pilot Flying/Pilot Monitoring duties and objectives clarified with respect to managing the system non-normal. ATC clearance received initially for vectors with subsequent clearance to BTG to HOLD at 9000 ft. HYD PUMP LOW PRESSURE QRH procedure accomplished enroute to Holding fix at BTG. Fuel on Board entering the hold at BTG approximately 14.5. Hydraulic System B Qty normal; ELEC 1 B side pump operating normally. In the HOLD; as we had anticipated; B SYS HYDRAULIC experienced a total quantity loss. This occurred after 1-2 turns and following initial notification to Dispatch. Dispatch notified of total SYS B HYD loss and intent to [advise ATC] with a return to ZZZ. Flight Attendant TEST brief accomplished IAW SOP; no planned Evacuation but anticipated CFR inspecting aircraft on runway after landing. PA accomplished with relevant information. QRH LOSS OF SYSTEM B Hydraulic accomplished. [Advised ATC] with request for vectors to ILS XXR. ZZZ ATIS X; 800 OVC; 10 miles; wind calm. Prior to departing the HOLD; I discussed all aspects of our actual and planned course of action; recommendations; possible omissions and any remaining considerations with my qualifying OE Captain. We elected to switch roles as this would be the qualifying Captain's first B737 landing in several years. I assumed the Pilot Flying role; briefed the approach and GA to include configuration points for Alternate Flap extension and after landing considerations. QRH LOSS OF SYSTEM B procedure reviewed by the Pilot Monitoring; deferred items accomplished. HOLD fix departed for downwind vectors RWY XXR ZZZ. Flaps extended to 5 on downwind. Gear extended at initial GS case break; Flaps selected to 15 at 1 1/2 dots below GS. Final stable configuration achieved by 1;400 [feet] AFE. Runway acquired visually at 800 AFE; uneventful landing accomplished with manual braking. Aircraft control transferred on centerline below 80 knots. CFR coordinated for exterior inspection of aircraft. Minimal manual breaking required during rollout; brake temperature was not suspected to be out of normal range. No exterior damage noted. We requested CFR to follow aircraft to gate. Flight attendant status verified; cabin secure prior to taxi. PA accomplished prior to aircraft movement. Uneventful taxi to gate. Operations; gate and customer coordination accomplished with ZZZ OPS. [Chief Pilot]; Dispatch; [Maintenance Control] contacted. ELB noted and entered via ACARS. Gate fuel at block in 11.4. Aircraft out of service for maintenance action/repair. ZZZ MX noted #2 ENG DRIVEN HYD Pump had failed with internal damage to the pump and system components.

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.