Narrative:

On the night of apr/thu/07; I installed 2 each nose wheels on aircraft X. I found out later that I had installed a mismatched pair; one bias tire and one radial tire. The problem was corrected -- it was noted by a pilot. I had been aware of this as an issue and also had been notified by our company through our safety program. In addition; although both nose wheels have the same part number; the tires are marked identifying them as bias or not. I believe my own complacency was the cause of this event; I should have been more diligent and double checked my own work; even on this routine task; which I do most every day. Now and in the future; I will do this. One suggestion to prevent this in the future is to segregate the wheels into separate rows or areas; even though they have the same part numbers; as it is now the wheels are lined up on the floor; in our stock area; in rows and are randomly mixed together. You can't identify them by just looking at the row of wheels without physically separating them.

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Original NASA ASRS Text

Title: A B737-700 ACFT TWO EACH NOSE TIRE REPLACEMENT WERE FOUND TO BE A MISMATCH OF ONE BIAS TIRE AND ONE RADIAL TIRE.

Narrative: ON THE NIGHT OF APR/THU/07; I INSTALLED 2 EACH NOSE WHEELS ON ACFT X. I FOUND OUT LATER THAT I HAD INSTALLED A MISMATCHED PAIR; ONE BIAS TIRE AND ONE RADIAL TIRE. THE PROB WAS CORRECTED -- IT WAS NOTED BY A PLT. I HAD BEEN AWARE OF THIS AS AN ISSUE AND ALSO HAD BEEN NOTIFIED BY OUR COMPANY THROUGH OUR SAFETY PROGRAM. IN ADDITION; ALTHOUGH BOTH NOSE WHEELS HAVE THE SAME PART NUMBER; THE TIRES ARE MARKED IDENTIFYING THEM AS BIAS OR NOT. I BELIEVE MY OWN COMPLACENCY WAS THE CAUSE OF THIS EVENT; I SHOULD HAVE BEEN MORE DILIGENT AND DOUBLE CHKED MY OWN WORK; EVEN ON THIS ROUTINE TASK; WHICH I DO MOST EVERY DAY. NOW AND IN THE FUTURE; I WILL DO THIS. ONE SUGGESTION TO PREVENT THIS IN THE FUTURE IS TO SEGREGATE THE WHEELS INTO SEPARATE ROWS OR AREAS; EVEN THOUGH THEY HAVE THE SAME PART NUMBERS; AS IT IS NOW THE WHEELS ARE LINED UP ON THE FLOOR; IN OUR STOCK AREA; IN ROWS AND ARE RANDOMLY MIXED TOGETHER. YOU CAN'T IDENTIFY THEM BY JUST LOOKING AT THE ROW OF WHEELS WITHOUT PHYSICALLY SEPARATING THEM.

Data retrieved from NASA's ASRS site as of January 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.