As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEPARTED STL HAD NO INDICATION OF A PROBLEM UNTIL 150 MILES OUT OF TOL. A-SYSTEM QUANTITY GAUGE SHOWED A SUDDEN LOSS OF INDICATED HYDRAULIC QUANTITY. FOLLOWED CCIA “A” SYSTEM FAIL PROCEDURE, ADVISED ATC AND DECLARED AN EMERGENCY AND LANDED AT OUR FINAL DESTINATION IN TOL WITHOUT INCIDENT. AIRCRAFT WAS INSPECTED AND THE A-SYSTEM HYDRAULIC PUMP WAS REPLACED. SERVICED AND BLEED HYDRAULIC SYSTEM IAW B727 MM 29-11-31, ALL SYSTEMS OPS CHECKED NORMAL AND AIRCRAFT RETURNED TO SERVICE.