Bell Helicopter Textron Undifferentiated or Other Model
Maintenance Powerplant; Maintenance Airframe
Training / Qualification; Workload; Distraction; Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance
Aircraft Aircraft Damaged; General Maintenance Action
Aircraft; Human Factors
Bell 407 helicopter was inducted to the ZZZ Repair Station for two cracks located on the Right-hand (RH) fuselage. After removal of the paint and filler material it was determined there was no actual structural damage in either locations. The Maintenance Manual (M/M) states that the action taken for this is to polish out and seal with Resin C-363. I mixed up the resin and applied the resin to the bare spots and then applied a heat lamp to this area to speed up the process without referring to the Manual. I was also working with Purchasing Department at the time with some duplicate Maintenance Tracking issues. I checked the resin every few minutes and the last time I looked; the paint was starting to discolor. I removed heat and began the damage evaluation of the area; this is still ongoing at this time. This event occurred from not performing the correct process per the Maintenance Manual (M/M) and using the wrong type of equipment.
A Maintenance Supervisor reports he did not follow the correct process in the Aircraft Maintenance Manual (AMM) when he attempted to repair two fuselage cracks on a Bell 407 helicopter.