What was found
DURING TAXIING PROCESS OF FLIGHT, THE 'THS' CONFIGURATION WENT ALL DOWN AND THE AIRCRAFT COULDN'T DEPART FROM LAX STATION. THE AIRCRAFT REMAINED ON GROUND FOR MAINTENANCE. TECHNICIANS CHECKED THE 'THS' MECHANISM PER AMM 27-44-00 AND FOUND ONE OF THE PLASTIC COVERS OF THE HYDRAULIC VALVE BLOCKS BROKEN, BOTH PLASTIC COVERS WERE REPLACED AS PER AMM 27-44-00. TEST OF THE 'THS' ACTUATOR ELECTRICAL CONTROL AND THE ELAC 1 AND 2 AND SEC 1 WAS PERFORMED PER AMM 27-96-00. TESTS RESULTS WERE SATISFACTORY AND THE AIRCRAFT RETURNED TO NORMAL OPERATION. (M)