A B737-700 was dispatched in non compliance with 1 incorrect nose tire installed.

Attributes
ACN	600083
Time
Date	200311
Day	Tue
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
ASRS Report	600083
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : manuals contributing factor : schedule pressure performance deficiency : installation performance deficiency : logbook entry performance deficiency : scheduled maintenance performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

On nov/tue/03, I was working on aircraft. I was doing a check and decided that the nose tires needed to be replaced, so I went to retrieve a set of lines so that I could begin to replace the tires per the maintenance manual. I needed to try to finish quickly because somebody else needed the nose jack. When I was down, I began to fill out my tags and my paperwork. I finished my check and proceeded to shut the aircraft down for the night. As far as I knew, I had completed my job correctly. On nov/sat/03, at XA30, I received a copy of aircraft history which showed the tire change made by me on nov/tue/03. I also received a copy of the log page dated nov/sat/03, which stated that on that day on a through flight, the first officer noticed unfamiliar tread on the nose tires. The mechanic proceeded to change the nose tires on the aircraft. As a result, what was found out was that one of the nose tires was a 300/500 tire and the other tire was 700 nose tire. I cannot believe this happened and how I was not able to catch this before the aircraft left my station. I am only grateful that there were no serious consequences and that the problem was corrected. I believe that, in my hurry to help other fellow mechanics that night, I neglected to pay close attention to my parts tags, paperwork and part numbers. The lesson I have learned is that this could have been avoided had I paid more attention and double-checked my paperwork, part numbers and equipment.

Original NASA ASRS Text

Title: A B737-700 WAS DISPATCHED IN NON COMPLIANCE WITH 1 INCORRECT NOSE TIRE INSTALLED.

Narrative: ON NOV/TUE/03, I WAS WORKING ON ACFT. I WAS DOING A CHK AND DECIDED THAT THE NOSE TIRES NEEDED TO BE REPLACED, SO I WENT TO RETRIEVE A SET OF LINES SO THAT I COULD BEGIN TO REPLACE THE TIRES PER THE MAINT MANUAL. I NEEDED TO TRY TO FINISH QUICKLY BECAUSE SOMEBODY ELSE NEEDED THE NOSE JACK. WHEN I WAS DOWN, I BEGAN TO FILL OUT MY TAGS AND MY PAPERWORK. I FINISHED MY CHK AND PROCEEDED TO SHUT THE ACFT DOWN FOR THE NIGHT. AS FAR AS I KNEW, I HAD COMPLETED MY JOB CORRECTLY. ON NOV/SAT/03, AT XA30, I RECEIVED A COPY OF ACFT HISTORY WHICH SHOWED THE TIRE CHANGE MADE BY ME ON NOV/TUE/03. I ALSO RECEIVED A COPY OF THE LOG PAGE DATED NOV/SAT/03, WHICH STATED THAT ON THAT DAY ON A THROUGH FLT, THE FO NOTICED UNFAMILIAR TREAD ON THE NOSE TIRES. THE MECH PROCEEDED TO CHANGE THE NOSE TIRES ON THE ACFT. AS A RESULT, WHAT WAS FOUND OUT WAS THAT ONE OF THE NOSE TIRES WAS A 300/500 TIRE AND THE OTHER TIRE WAS 700 NOSE TIRE. I CANNOT BELIEVE THIS HAPPENED AND HOW I WAS NOT ABLE TO CATCH THIS BEFORE THE ACFT LEFT MY STATION. I AM ONLY GRATEFUL THAT THERE WERE NO SERIOUS CONSEQUENCES AND THAT THE PROB WAS CORRECTED. I BELIEVE THAT, IN MY HURRY TO HELP OTHER FELLOW MECHS THAT NIGHT, I NEGLECTED TO PAY CLOSE ATTN TO MY PARTS TAGS, PAPERWORK AND PART NUMBERS. THE LESSON I HAVE LEARNED IS THAT THIS COULD HAVE BEEN AVOIDED HAD I PAID MORE ATTN AND DOUBLE-CHKED MY PAPERWORK, PART NUMBERS AND EQUIP.

Data retrieved from NASA's ASRS site as of July 2007 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.