B757-200
Maintenance Airframe; Maintenance Powerplant
Time Pressure
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural MEL / CDL; Deviation / Discrepancy - Procedural Published Material / Policy
General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; MEL; Human Factors; Incorrect / Not Installed / Unavailable Part
Aircraft X deferred the Number 3 Comm inoperative for dispatch purposes. Number 1 Comm was inoperative could not defer the Number 1 so swapped out Number 1 with Number 3 position transceivers. So Number 1 operational for Dispatch. Found out Day 7 that part Number's are not interchangeable. But when I referenced the IPC 23-XX-XX-X item Number XXXX it seemed to be. IPC can be very ambiguous. Not definitive to say the least. I was also not notified of this Maintenance discrepancy of the exact nature of the discrepancy. I was notified on Day 0; but the Maintenance Supervisor would not tell me the exact reason. I ask on Day 1 and then on Day 2 with no response.
Technician reported installing wrong effectivity part during MEL procedures for inoperative Number 1 VHF Comm.