A Line Mechanic reports he moved the #2 engine Nacelle (NAC) Anti-Ice valve to the 'Open' position to defer the NAC valve for flight; in the process he failed to remove the circuit breaker collar and reset the circuit breaker.

Narrative

September 2011; Flight arrived at XA:30a.m. During debriefing between myself and the crew; I was advised of a situation with the #2 engine Nacelle (NAC) valve. They had also made the following Logbook entry: #2 engine NAC valve did not open when Anti-Ice was selected. In completing the Through Flight Check on the turn (outbound) airplane; I requested Mechanic Y; who worked with me on this plane; to research the MEL with regard to the #2 engine NAC valve. Thereafter; I opened and collared the Circuit Breaker (C/B) for the #2 engine NAC valve. Mechanic Y confirmed the valve could be deferred; and at that point I opened the Circuit Breaker for the #2 engine NAC valve. Then; Mechanic Y and I opened the cowling on the #2 engine. I placed the valve in the 'Open' position and Mechanic Y went into the cockpit and verified that the cockpit indicators showed the valve was in the 'Open' position. We closed the cowling and Mechanic Y returned to the office. I reread the MEL; reopened the cowling and; according to my understanding of the instructions; secured the valve open with safety wire. This plane was a through flight. The prior flight was delayed; we were dealing with an unexpected tail swap on Flight; and in addition; the crew was returning at this time to prepare for the next flight. In my haste to complete my task; I apparently neglected to remove the C/B collar and reset the circuit breaker. I have worked exclusively on jet airplanes since 1978. At no time have I ever received any verbal or written warnings from an employer or the FAA regarding any aspect of my job performance. In fact; I appreciate my job; take great pride in the quality of my work; my work ethic; and the time I have worked for this Air Carrier.