B737 captain reported loss of a hydraulic system on approach.

Attributes
ACN	1293680
Time
Date	201509
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Hydraulic Main System
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 184 Flight Crew Type 10000
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

On downwind; the a-system engine driven light flickered. There was about 25 percent quantity remaining. We lowered the gear immediately before losing the entire a-system. Shortly thereafter the a-system quantity was zero and both lights were illuminated. We accomplished the checklist on the turn to final and prepared to land. I [advised ATC of the situation] in order to reduce the radio calls for base to final turns and was sent to tower. We landed uneventfully and were able to taxi to the gate.

Original NASA ASRS Text

Title: B737 Captain reported loss of A hydraulic system on approach.

Narrative: On downwind; the A-system engine driven light flickered. There was about 25 percent quantity remaining. We lowered the gear immediately before losing the entire A-system. Shortly thereafter the A-system quantity was zero and both lights were illuminated. We accomplished the checklist on the turn to final and prepared to land. I [advised ATC of the situation] in order to reduce the radio calls for base to final turns and was sent to Tower. We landed uneventfully and were able to taxi to the gate.

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.