What was found
DURING DESCENT LOST ALL OF SYS A HYD QUANITY PRESSURE WAS NORMAL - 3000 PSI AND NO A.R.E. OR ENG PUMP LOW PRESSURE LIGHTS WERE ILLUMINATED AFTER TEN MINUTES BOTH ENG 1 AND ENG 2 LOW PRESSURE LIGHTS STARTED TO FLASH. TURNED BOTH SYSTEM OFF AT THE PUMP SWITCHES. QUANTITY ZERO, PRESSURE ZERO. REMOVED AND INSPECTED BOTH HYDRAULIC SYSTEM A PRESSURE FILTERS. NO CONTAMINATION FOUND. INSTALLED NEW ELEMENTS. NO LEAKS NOTED. REF AMM 29-11-062-3. ALSO REMOVED AND INSPECTED NR 1 AND NR 2 ENGINE CASE DRAIN FILTERS. NO CONTAMINATION NOTED. INSTALLED NEW ELEMENTS. GROUND RAN ENGINES. NO LEAKS NOTED.