MD-11
Maintenance Airframe; Maintenance Powerplant
Maintenance Technician 28
Workload; Situational Awareness; Communication Breakdown; Distraction
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Company Policy; Human Factors; Incorrect / Not Installed / Unavailable Part; Staffing
Opened the # 1 engine left-hand engine cowl and thrust reverser (T/R) on an MD-11 aircraft at Gate XXX for hanger crew to Remove and Replace (R/R) the # 1 Engine Integrated Drive Generator (IDG). Did not pull and collar the circuit breakers called out in the Aircraft Maintenance Manual (AMM) 71-10-00-2-1. Was working other gates and also right after cowling was opened; hanger mechanics showed up and I gave them a turnover and forgot to pull and collar circuit breakers. I was working other gates that night; things were hectic and [I] was going back and forth to other aircraft. I did miss pulling and collaring the circuit breakers. I think if one is assigned to work an Out of Service (OTS) aircraft; you should be relieved of all other gates. We normally work with a shortage of manpower.
Reporter stated even though he has twenty-eight years experience as a Mechanic; he was distracted by his workload and just did not pull and collar the # 1 Engine IDG Circuit Breaker. No other event or incident occurred.
A Line Mechanic reports he did not pull and collar Circuit Breakers that were called out in their MD-11 Aircraft Maintenance Manual (AMM) Chapter 71-10-00-2 for replacement of the # 1 Engine Integrated Drive Generator (IDG). He had been working multiple gates and the Out of Service (OTS) MD-11 aircraft.