Mechanic changing a #1 main tire on a B737ER; fails to notice the two letter designator 'er' on the removed tire; was a special type required for this particular airplane. Correct tire was installed approximately twenty days later.

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Attributes
ACN	808390
Time
Date	200809
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
Experience	maintenance technician : 9.5
ASRS Report	808390
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : manuals contributing factor : briefing performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

Bulletin about aircraft (737ER) was posted on the website. I read it the same day it came out. I had never changed a tire on this particular airplane. I got my work assignment on the night of sep/xa/08. I was working overtime that night. The assignment was to perform a service check on this plane (737ER). Found that #1 tire needed to be replaced. Several months had past by and did not realize about the bulletin on the website. I looked through the maintenance manual and for some reason I did not come across it. I finished my assignment without knowing that this particular tire for this particular plane had the 2 letters ('er') at the end. I have svced this plane in the past for other reasons but this was my first time changing a tire on this particular plane. It was brought up to my attention on the night of oct/xa/08; that this had been reported on the discrepancy detailed report. I looked it up on the website and read the report; noticing that this was corrected by another maintenance mechanic. Tire was replaced on oct/xa/08 at another station.

Original NASA ASRS Text

Title: MECHANIC CHANGING A #1 MAIN TIRE ON A B737ER; FAILS TO NOTICE THE TWO LETTER DESIGNATOR 'ER' ON THE REMOVED TIRE; WAS A SPECIAL TYPE REQUIRED FOR THIS PARTICULAR AIRPLANE. CORRECT TIRE WAS INSTALLED APPROXIMATELY TWENTY DAYS LATER.

Narrative: BULLETIN ABOUT ACFT (737ER) WAS POSTED ON THE WEBSITE. I READ IT THE SAME DAY IT CAME OUT. I HAD NEVER CHANGED A TIRE ON THIS PARTICULAR AIRPLANE. I GOT MY WORK ASSIGNMENT ON THE NIGHT OF SEP/XA/08. I WAS WORKING OVERTIME THAT NIGHT. THE ASSIGNMENT WAS TO PERFORM A SVC CHK ON THIS PLANE (737ER). FOUND THAT #1 TIRE NEEDED TO BE REPLACED. SEVERAL MONTHS HAD PAST BY AND DID NOT REALIZE ABOUT THE BULLETIN ON THE WEBSITE. I LOOKED THROUGH THE MAINT MANUAL AND FOR SOME REASON I DID NOT COME ACROSS IT. I FINISHED MY ASSIGNMENT WITHOUT KNOWING THAT THIS PARTICULAR TIRE FOR THIS PARTICULAR PLANE HAD THE 2 LETTERS ('ER') AT THE END. I HAVE SVCED THIS PLANE IN THE PAST FOR OTHER REASONS BUT THIS WAS MY FIRST TIME CHANGING A TIRE ON THIS PARTICULAR PLANE. IT WAS BROUGHT UP TO MY ATTN ON THE NIGHT OF OCT/XA/08; THAT THIS HAD BEEN RPTED ON THE DISCREPANCY DETAILED RPT. I LOOKED IT UP ON THE WEBSITE AND READ THE RPT; NOTICING THAT THIS WAS CORRECTED BY ANOTHER MAINT MECH. TIRE WAS REPLACED ON OCT/XA/08 AT ANOTHER STATION.

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.