Two Lead Mechanics and a Mechanic who were working a LVDT change from a logbook write-up of excessive rudder trim; are informed they did not have the required inspection (RII) block signed off in the logbook; prior to releasing the B757-200.

Narrative

To assist in the prevention of this happening again; I would suggest the General Manual be more specific in the equipment RII listing. In reviewing the pertinent chapter; it states that autopilot components are not included. The Linear Variable Differential Transformer (LVDT) works directly with the autopilot system and can be mistaken as a non RII item. The Aircraft Maintenance Manual does show tiny RIIs off to the side and if concentrating on the wording; could be missed. I believe these could be factors in this discrepancy. I was informed that I may have committed a violation of not having an RII documented on Aircraft X. In December 2008; the crew was troubleshooting an aircraft trim problem. A rudder LVDT was changed at shift change and turned over to the next crew. The Mechanic did not sign for the installation. I checked the Mechanic's work and printed his name and signed my name per the General Manual. I informed the oncoming crew that it required rig and operational checkouts. The next crew checked the LVDT and found it bad. They replaced the first LVDT with a new one. Rigged and Operations Checked the new one and signed the item off as serviceable. The logbook reflects this work. The problem is it was an RII and the RII block was not signed off. The logbook page does not show the RII block being signed off. Supplemental information from ACN 822523: I received an email informing me that I reviewed and released Aircraft X's logbook and failed to notice a missed RII inspection that was required for a rudder LVDT replacement that happened in December 2008. Supplemental information from ACN 822524: We were working a LVDT change from a logbook write-up of excessive rudder trim. We were continuing a task started on dayshift. Inspection did inspect the rig but we neglected to have him sign the RII block in the logbook page. We were working under the direct supervision of a Lead Technician. I signed the logbook as a summary of the work performed by the Mechanics under my supervision that day.