MD-82
Aircraft Equipment Problem Critical
Flight Crew Overcame Equipment Problem; General Declared Emergency; General Maintenance Action
Aircraft
During descent for landing; leaving FL180; the 'Right Hydraulic Low Pressure' and 'Manual Rudder Control' annunciators on the overhead panel illuminated. The right hydraulic pressure read nearly zero PSI. The right hydraulic quantity read 16+ (very high). We performed the Hydraulic Pressure Low; L/R quantity Low or Decreasing or Abnormally High Abnormal QRH checklist but the abnormal condition persisted. We declared an emergency with Approach Control and were cleared for a visual approach to Runway XXR.  CFR; as well as Company Maintenance; were notified and joined the common frequency. At 5;000 FT descending we attempted and successfully re-pressurized the right hydraulic system IAW the QRH. We then extended the slats; flaps; and landing gear on schedule per the QRH and landed without incident. CFR conducted a visual inspection of the aircraft and cleared Maintenance to pin the gear and tow the aircraft to the gate.
[Narrative had no additional information].
During their descent an MD-82 flight crew performed appropriate QRH procedures in response to an abnormal hydraulic system condition; declared an emergency; and landed without incident.