B777-200
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Human Factors; Manuals
XA:30 - Aircraft blocked in. XA:45 - commence aircraft arrival walk around. XA:55 - found #4 tire showing cord on shoulder and continued walk around. XB:05 - Went to cockpit and did routine check. Checked AMM (Aircraft Maintenance Manual) to get reference to OIL #4 tire. Read AMM 32-XX-XX-X and discussed with Maintenance Control. Found that there was no information saying that tire must be replaced before flight if first layer cord found on shoulder. Assumed that tire can be placed under OIL. XC:54 - aircraft departed. No Maintenance delay.Perhaps a bold statement on the AMM stating that Cord on shoulder not allowed and must be replaced before flight.
Technician reported misunderstanding reference for placing a main tire on MEL and dispatching the aircraft.