B737 flight crew reported the loss of multiple hydraulic systems.

Attributes
ACN	1485376
Time
Date	201709
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Hydraulic System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

At cruise B system engine hydraulic pump low pressure light illuminated. We ran QRH. Approximately 30 minutes later; the B hydraulic fluid started to decrease; and then the B system electric hydraulic pump low pressure light illuminated. We ran the QRH then ran loss of system B. Shortly after B hydraulic quantity went to zero. After loss of B system we [advised ATC]; planning on landing at ZZZ. Approximately 30 minutes later the a system engine hydraulic pump low pressure light illuminated. We ran the QRH again. So now all that is operating is the a system electric hydraulic pump. A hydraulic quantity decreased to 74 percent from approximately 90 percent; so as a precaution we reviewed the 'manual reversion or loss of system a and system B.' we flew a long final to altitude; extended the flaps and put the gear out early in case of loss of system a. The a hydraulic quantity remained stable and we landed runway xx; flaps 15 and taxied clear of the runway. We left the flaps at 15 and taxied to the charter pad.

Original NASA ASRS Text

Title: B737 flight crew reported the loss of multiple hydraulic systems.

Narrative: At cruise B System Engine Hydraulic Pump Low Pressure light illuminated. We ran QRH. Approximately 30 minutes later; the B hydraulic fluid started to decrease; and then the B System Electric Hydraulic Pump Low Pressure light illuminated. We ran the QRH then ran Loss of System B. Shortly after B hydraulic quantity went to zero. After loss of B System we [advised ATC]; planning on landing at ZZZ. Approximately 30 minutes later the A System Engine Hydraulic Pump Low Pressure light illuminated. We ran the QRH again. So now all that is operating is the A System electric hydraulic pump. A hydraulic quantity decreased to 74 percent from approximately 90 percent; so as a precaution we reviewed the 'Manual Reversion or Loss of System A and System B.' We flew a long final to altitude; extended the flaps and put the gear out early in case of Loss of System A. The A hydraulic quantity remained stable and we landed Runway XX; flaps 15 and taxied clear of the runway. We left the flaps at 15 and taxied to the charter pad.

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.