Light Transport; Low Wing; 2 Turboprop Eng
Maintenance Airframe; Maintenance Powerplant
Troubleshooting; Time Pressure; Training / Qualification; Confusion
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural MEL / CDL
General Flight Cancelled / Delayed; General Maintenance Action
Procedure; Staffing; MEL; Logbook Entry; Human Factors; Aircraft
I deferred a defect for the VHF Comm broken knobs on the observer audio panel for Aircraft X. I used MEL 23-XX-XX-XX. I incorrectly interpreted this MEL for the observer audio panel when the MEL states that 2 Communications Systems (VHF) are installed. So the assumption is that the observer audio panel is excluded from this and it only applies to the Captain and First Officer. The Aircraft had accomplished one flight from ZZZ to ZZZ1. I had discovered the error a few hours after. The MEL is confusing for my level of experience; and suggest that this MEL be reviewed and changes made to it.
During the deferral process; I was working with [Name] to sign off the discrepancy using an MEL for the audio control panel for the observer side. When talking with [Name]; he said he had deferred the item already in TRAX and called to give me the information and walk me through the sign off. I went with the MEL number that he gave me. After I finished the MEL with him I finished closing he work order on Aircraft X to get it ready for the flight. I did not double check the MEL number he gave me and later he called me to tell me he gave me the wrong MEL number. I fixed it on the paperwork that I had.  I will need to make sure I double check any MEL Maintenance Control gives me to make sure it is the correct one and they we all agree.
Technician reported applying the wrong MEL and the aircraft flew in service.