B737-700
Maintenance Powerplant; Maintenance Airframe
Communication Breakdown; Distraction; Troubleshooting; Situational Awareness
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Chart Or Publication; Human Factors; Incorrect / Not Installed / Unavailable Part; Procedure
After several minutes of troubleshooting; we called Maintenance Control to check the possibility of placing #2 Engine Thrust Reverser on MEL. I was on phone a long time discussing the problem. It took an extended amount of time to get MEL information. I was working with another Mechanic; we shared in the tasks to place #2 Engine Thrust Reverser on MEL. For reasons unknown; we installed lockout pins in #1 Engine. (I) signed the logbook; therefore it was my responsibility to verify all work was done correctly. [Recommend] after completing special procedures it would be best to go back a second time and verify all work was done by another Aircraft Maintenance Technician.
On a B737-700 aircraft; #2 Engine Thrust Reverser would not deploy. After troubleshooting the Thrust Reverser; it was determined that we couldn't fix it on the gate and it should be placed on MEL. I told the other Mechanic to call Maintenance Control and get our MEL information and I would lock-out the Thrust Reverser. I inadvertently walked to #1 Engine and installed the lockout pins. I was focused on running a mental check list on all the items that needed to be done to apply this MEL; since it is an involved MEL; I was trying to make sure we didn't forget any tasks. Unfortunately someone else signed the logbook for my mistake. [Recommend] making Thrust Reverser lockout an RII item.
Two line mechanics report they had inadvertently installed lockout pins on the #1 engine thrust reverser during an MEL deferral for the #2 engine thrust reverser that would not deploy.