What was found
DURING CRUISE FLIGHT HYD SYS A QTY DECREASED TO 2.4 GALLONS. QRH PROCEDURES WERE FOLLOWED AND AFTER THE SYS A SPOILERS SWITCH WAS CLOSED LEAK APPEARED TO STOP. INSPECTED ACFT FOR EVIDENCE OF HYD LEAK IAW MM 29-00-000-6 PARA 1.B. NO LEAKS NOTED QTY AT BLOCK IN ON SYS A WAS 4.1 GALLONS. CREW REPORTED THAT THE QTY INDICATION WAS SOMEWHAT ERRATIC. SUSPECT INDICATOR AND/OR QTY TRANSMITTER. PERFORMED HYD SYS INTERNAL LEAKAGE CHECK IAW MM 29-00-00-6 PARA C. (1)-(4)A. THE TOTAL SYS "B" LEAKAGE WAS 250 CC/MIN. THE MAX ALLOWED IS 17000 CC/MIN. THE TOTAL SYS "A" LEAKAGE WAS 2500 CC/MIN. THE MAX ALLOWED IS 20800 CC/MIN. R & R "A" SYS. QTY IND IAW BMM 31-00-011-4-0, SERVICED TO FULL, COMPARED TO DIRECT READING GAUGE, CHECKED NORMAL.