B757-200
Maintenance Powerplant; Maintenance Airframe
Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
General Flight Cancelled / Delayed; General Maintenance Action
Human Factors
I was assigned to remove and replace a fuel flow governor on aircraft's #2 engine. I was the Mechanic and another Mechanic was [performing] the RII (Required Inspection Item). I [later] became aware that the Mechanic who performed the RII was not certified on B-757 aircraft. I notified my Supervisor and aircraft Maintenance Control immediately and the aircraft was taken out of service.
B757 Airline Mechanic reported a procedural violation regarding a non qualified technician performing maintenance on aircraft.