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Mechanic reports on replacing the #4 main landing gear tire on a B737-900ER aircraft with a B737-900 standard type tire.
| Attributes | |
| ACN | 784233 |
| Time | |
| Date | 200804 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-900 |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance technician : 17 |
| ASRS Report | 784233 |
| Events | |
| Anomaly | maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| 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 : installation performance deficiency : non compliance with legal requirements performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Chart Or Publication Company |
| Primary Problem | Maintenance Human Performance |
Narrative:
Mistakenly installed a B737-900 main landing gear wheel/tire assembly on a B737-900ER aircraft. Talked with management about lack of B737-900ER aircraft confign markings/stenciling on aircraft landing gear doors and in service tires. Non B737-900ER #4 main landing gear wheel/tire assembly has been removed and replaced with a B737-900ER wheel/tire assembly. Callback conversation with reporter revealed the following information: reporter stated there are two extra plies on the B737-900ER main landing gear tires. Also; the wheel halves are different to carry the extra aircraft weight. His carrier intends to apply markings or placards on the main landing gear doors indicating the -900ER tire requirements. They have a mix of -900's and -900ER's and this has created some confusion at times. New B737-900ER's from boeing do not have any stenciling on the tires indicating the aircraft is a -900ER. They had been using the serial number on the tire for identification; not the part number on the wheel half.
Original NASA ASRS Text
Title: MECHANIC REPORTS ON REPLACING THE #4 MAIN LANDING GEAR TIRE ON A B737-900ER ACFT WITH A B737-900 STANDARD TYPE TIRE.
Narrative: MISTAKENLY INSTALLED A B737-900 MAIN LNDG GEAR WHEEL/TIRE ASSEMBLY ON A B737-900ER ACFT. TALKED WITH MGMNT ABOUT LACK OF B737-900ER ACFT CONFIGN MARKINGS/STENCILING ON ACFT LNDG GEAR DOORS AND IN SVC TIRES. NON B737-900ER #4 MAIN LNDG GEAR WHEEL/TIRE ASSEMBLY HAS BEEN REMOVED AND REPLACED WITH A B737-900ER WHEEL/TIRE ASSEMBLY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THERE ARE TWO EXTRA PLIES ON THE B737-900ER MAIN LANDING GEAR TIRES. ALSO; THE WHEEL HALVES ARE DIFFERENT TO CARRY THE EXTRA ACFT WEIGHT. HIS CARRIER INTENDS TO APPLY MARKINGS OR PLACARDS ON THE MAIN LANDING GEAR DOORS INDICATING THE -900ER TIRE REQUIREMENTS. THEY HAVE A MIX OF -900'S AND -900ER'S AND THIS HAS CREATED SOME CONFUSION AT TIMES. NEW B737-900ER'S FROM BOEING DO NOT HAVE ANY STENCILING ON THE TIRES INDICATING THE ACFT IS A -900ER. THEY HAD BEEN USING THE SERIAL NUMBER ON THE TIRE FOR IDENTIFICATION; NOT THE PART NUMBER ON THE WHEEL HALF.
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.