Narrative:

I was given task to replace aircraft X #3 tire change; which is a B737-900 type aircraft. I put on a B737-900 tire but the tire was not rated for this B737-900 which is a higher gross weight tire. The tire I put on was stenciled use on B737 type 700-800-900. I failed to realize the tire was not rated for our new B737 type of aircraft. I feel the problem can be resolved by stenciling on the tire 'not for use on this type aircraft.' this mistake has been made many times over and I am trying to educate all technicians of this issue. Callback conversation with reporter revealed the following information: reporter stated they have different series of B737-900 aircraft that require tire/wheel assemblies that can carry heavier fuel loads. But the tire/wheel assemblies for their lower gross weight -900's are being installed on the heavier gross series -900's. Reporter stated the tires are the same; but the tire wheel halves for the heavier rated -900's are beefier and stronger. That strength is achieved by using a longer heat treatment curing process. Reporter stated the aircraft he had inadvertently installed the lower rated tire/wheel assembly on; had made fifty-five landings in twelve days.

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Original NASA ASRS Text

Title: A LEAD MECHANIC REPORTS ON HIS MISTAKE; AND THE SAME CONTINUING PROBLEM OTHER MECHANICS HAVE HAD INSTALLING AN INCORRECT TIRE/WHEEL ASSEMBLY ON DIFFERENT SERIES OF THEIR B737-900 AIRCRAFT.

Narrative: I WAS GIVEN TASK TO REPLACE ACFT X #3 TIRE CHANGE; WHICH IS A B737-900 TYPE ACFT. I PUT ON A B737-900 TIRE BUT THE TIRE WAS NOT RATED FOR THIS B737-900 WHICH IS A HIGHER GROSS WT TIRE. THE TIRE I PUT ON WAS STENCILED USE ON B737 TYPE 700-800-900. I FAILED TO REALIZE THE TIRE WAS NOT RATED FOR OUR NEW B737 TYPE OF ACFT. I FEEL THE PROB CAN BE RESOLVED BY STENCILING ON THE TIRE 'NOT FOR USE ON THIS TYPE ACFT.' THIS MISTAKE HAS BEEN MADE MANY TIMES OVER AND I AM TRYING TO EDUCATE ALL TECHNICIANS OF THIS ISSUE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THEY HAVE DIFFERENT SERIES OF B737-900 AIRCRAFT THAT REQUIRE TIRE/WHEEL ASSEMBLIES THAT CAN CARRY HEAVIER FUEL LOADS. BUT THE TIRE/WHEEL ASSEMBLIES FOR THEIR LOWER GROSS WEIGHT -900'S ARE BEING INSTALLED ON THE HEAVIER GROSS SERIES -900'S. REPORTER STATED THE TIRES ARE THE SAME; BUT THE TIRE WHEEL HALVES FOR THE HEAVIER RATED -900'S ARE BEEFIER AND STRONGER. THAT STRENGTH IS ACHIEVED BY USING A LONGER HEAT TREATMENT CURING PROCESS. REPORTER STATED THE AIRCRAFT HE HAD INADVERTENTLY INSTALLED THE LOWER RATED TIRE/WHEEL ASSEMBLY ON; HAD MADE FIFTY-FIVE LANDINGS IN TWELVE DAYS.

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.