Two line mechanics report they had inadvertently installed lockout pins on the #1 engine thrust reve...

Attributes
ACN	1023291
Time
Date	201207
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Fan Reverser
Person 1
Function	Technician
Qualification	Maintenance Powerplant Maintenance Airframe
Person 2
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural FAR Deviation - Procedural Published Material / Policy

Narrative:

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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.