A B737-400 WAS REMOVED FROM SVC FOR LOOSE AILERON BUS CABLES. 2 WORK AILERON BUS CABLE PULLEYS WERE REPLACED ON PREVIOUS MAINT CHK.

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ON OCT/THU/03; ACFT WAS IN MAINT FOR A C-CHK. I WAS ASSIGNED A JOB CARD TO CHANGE 2 WORN PULLEYS FOR THE AILERON BUS CABLE SYS AT BODY STATION 663 IN THE R-HAND WHEELWELL. THE CARD WAS STAMPED CRITICAL INSPECTION NOT REQUIRED. CONFERRED WITH INSPECTION TO SEE IF THE BUY BACK BLOCK SHOULD BE A NARII. INSPECTION SAID AS LONG AS CABLE TENSION WAS NOT DISTURBED; THE CARD COULD REMAIN AS WRITTEN. I CHANGED THE 2 PULLEYS WITHOUT LOOSENING CABLE TENSION AND SIGNED THE CARD OFF. REF MAINT POLICY AND PROCS PARAGRAPH 1 STATES FOR MECHS DUTY: IN THE EVENT A FLT CTL CABLE OR A QAI CABLE SYS (REFED FROM A JOB PROC CARD) IS DISCONNECTED OR LOOSENED TO A ZERO TENSION CONDITION; ON A CABLE SYS THAT CAN NOT BE ENTIRELY VISUALLY INSPECTED AFTER THE WORK IS COMPLETED; NOTIFY INSPECTION OF THE SIT BEFORE THE SYS IS DISTURBED. THIS SYS CAN BE VISUALLY INSPECTED. ACFT WENT BACK INTO SVC. ACFT WAS TAKEN OTS FOR SUSPICION OF LOOSE AILERON BUS CABLES. CABLE TENSIONS WERE CHKED BY MAINT IN ZZZ HANGAR ON THE L AND R AILERON BUS CABLES. TO THE BEST OF MY KNOWLEDGE; THERE WERE NO WRITE-UPS IN THE LOGBOOKS ON THE AILERONS. AS I STATED EARLIER; SINCE I DID NOT LOOSEN CABLE TENSION TO CHANGE THE PULLEYS; NOR DID THE CARD INSTRUCT ME TO CHK TENSION AFTER INSTALLATION OF THE PULLEYS; I DID NOT CHK THE CABLE TENSION ON THE R HAND SIDE AILERON BUS CABLE.