B737-800
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
General Declared Emergency
Aircraft
During final approach; when we started to lower flaps for landing; the B Hydraulic System failed. We executed a go-around; declared an emergency; completed QRH procedures and then landed uneventfully. ARFF equipment met us on the ground and looked us over. After they gave us the all clear; we taxied to the gate where we were met by Maintenance.
We had the gear down; Flaps 15. We heard and felt a slight buzzing noise. Looked at the over head and the Right Hydraulic engine driven pump low pressure light was on. We looked at the pressure and quantity and System B pressure was low and quantity was decreasing. We did a go around; so we could run the check list and properly configure the aircraft for landing. We declared an emergency; did a box pattern; back to [the runway] and landed uneventfully.
B737-800 flight crew reported loss of B Hydraulic System. They executed a go-around; ran the procedure; declared an emergency; and a normal landing ensued.