SA-227 AC Metro III
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 300; Flight Crew Total 2400; Flight Crew Type 700
Situational Awareness
Aircraft Equipment Problem Less Severe
Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
On the arrival route the two 'L+R Hydraulic Pressure' annunciation lights illuminated. For the duration of the flight they went on/off intermittently while during the last 5 minutes of the flight finally went to solid 'on'. The hydraulic pressure was zero. I notified Approach control of the emergency condition. I shot the ILS via vectors. I emergency extended the landing gear per the Quick Reference Handbook without incident. I received 'Three Green Indication' upon doing so. I landed without further incident.
SA227 Captain experiences loss of both hydraulic systems during descent for landing. An emergency condition is encountered and the gear is extended via the QRH; resulting in three green indications. An ILS approach and landing ensues.