Narrative:

I was assigned aircraft to do an overnight check. On the check; I had 3 tires to change -- #3 main and the left and right nose tires. I changed the #3 main tire and mechanic #2 started to change the nose tires. At that time it started raining really hard; so I told mechanic #2 that we would take a break and get some coffee and see if the rain would let up come. When we came back; the rain had let up so we finished installing the nose tires. I installed 1 tire and mechanic #2; the other. I went to get the tire cart. There were 4 main tires and 2 nose tires on the cart and I assumed that they were nose tires. Filled out the parts tags and I signed off the installation. I take full responsibility for the problem. It was my responsibility to check the tags and be sure we installed the proper parts. Supplemental information from acn 815534: I arrived at assigned aircraft to help mechanic #1 change nose tires. Mechanic #1 had already got the nose tires to the aircraft. I changed the #2 and he changed #1 tire. I filled out the parts tag. I did not notice that they were the wrong effectivity.

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Original NASA ASRS Text

Title: AFTER A PAPERWORK AUDIT; TWO MECHANICS ARE INFORMED THE NOSE TIRES THEY INSTALLED ON A B737-700 WERE THE WRONG EFFECTIVITY.

Narrative: I WAS ASSIGNED ACFT TO DO AN OVERNIGHT CHK. ON THE CHK; I HAD 3 TIRES TO CHANGE -- #3 MAIN AND THE L AND R NOSE TIRES. I CHANGED THE #3 MAIN TIRE AND MECH #2 STARTED TO CHANGE THE NOSE TIRES. AT THAT TIME IT STARTED RAINING REALLY HARD; SO I TOLD MECHANIC #2 THAT WE WOULD TAKE A BREAK AND GET SOME COFFEE AND SEE IF THE RAIN WOULD LET UP COME. WHEN WE CAME BACK; THE RAIN HAD LET UP SO WE FINISHED INSTALLING THE NOSE TIRES. I INSTALLED 1 TIRE AND MECH #2; THE OTHER. I WENT TO GET THE TIRE CART. THERE WERE 4 MAIN TIRES AND 2 NOSE TIRES ON THE CART AND I ASSUMED THAT THEY WERE NOSE TIRES. FILLED OUT THE PARTS TAGS AND I SIGNED OFF THE INSTALLATION. I TAKE FULL RESPONSIBILITY FOR THE PROB. IT WAS MY RESPONSIBILITY TO CHK THE TAGS AND BE SURE WE INSTALLED THE PROPER PARTS. SUPPLEMENTAL INFO FROM ACN 815534: I ARRIVED AT ASSIGNED ACFT TO HELP MECH #1 CHANGE NOSE TIRES. MECH #1 HAD ALREADY GOT THE NOSE TIRES TO THE ACFT. I CHANGED THE #2 AND HE CHANGED #1 TIRE. I FILLED OUT THE PARTS TAG. I DID NOT NOTICE THAT THEY WERE THE WRONG EFFECTIVITY.

Data retrieved from NASA's ASRS site as of May 2009 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.