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An aircraft mechanic realizes after aircraft had departed; that he had replaced both nose gear tires with a mis-match set of tires (bias and radial ply).
| Attributes | |
| ACN | 759080 |
| Time | |
| Date | 200710 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 759080 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other other : 1 |
| Resolutory Action | other |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : briefing contributing factor : schedule pressure performance deficiency : installation performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : training |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Chart Or Publication Company |
| Primary Problem | Maintenance Human Performance |
Narrative:
My work partner and myself had finished one of our aircraft for the night. We went to help out on someone else's aircraft. We each pulled a tire off the tire cart and began changing the nose tires. We were finishing up with the tires when the persons assigned to the aircraft showed up. We started informing them what still needed to be done to the aircraft while we continued finishing the tires. I had been thinking to check the other tire for bins markings but during the turnover with the other crew I missed it. Normally; whenever I change nose tires; I do both tires so I know what goes on. However my work partner was new to the company and asked if he could change one. I said that would be fine; but with the untimely arrival and distrs; it was missed that we had mismatched (radial and bias) tires installed. It is in my opinion that there is no question there should be a different part number differentiating between the 2 tires. This would stop a great number; if not all; of these occurrences.
Original NASA ASRS Text
Title: AN ACFT MECHANIC REALIZES AFTER ACFT HAD DEPARTED; THAT HE HAD REPLACED BOTH NOSE GEAR TIRES WITH A MIS-MATCH SET OF TIRES (BIAS AND RADIAL PLY).
Narrative: MY WORK PARTNER AND MYSELF HAD FINISHED ONE OF OUR ACFT FOR THE NIGHT. WE WENT TO HELP OUT ON SOMEONE ELSE'S ACFT. WE EACH PULLED A TIRE OFF THE TIRE CART AND BEGAN CHANGING THE NOSE TIRES. WE WERE FINISHING UP WITH THE TIRES WHEN THE PERSONS ASSIGNED TO THE ACFT SHOWED UP. WE STARTED INFORMING THEM WHAT STILL NEEDED TO BE DONE TO THE ACFT WHILE WE CONTINUED FINISHING THE TIRES. I HAD BEEN THINKING TO CHK THE OTHER TIRE FOR BINS MARKINGS BUT DURING THE TURNOVER WITH THE OTHER CREW I MISSED IT. NORMALLY; WHENEVER I CHANGE NOSE TIRES; I DO BOTH TIRES SO I KNOW WHAT GOES ON. HOWEVER MY WORK PARTNER WAS NEW TO THE COMPANY AND ASKED IF HE COULD CHANGE ONE. I SAID THAT WOULD BE FINE; BUT WITH THE UNTIMELY ARR AND DISTRS; IT WAS MISSED THAT WE HAD MISMATCHED (RADIAL AND BIAS) TIRES INSTALLED. IT IS IN MY OPINION THAT THERE IS NO QUESTION THERE SHOULD BE A DIFFERENT PART NUMBER DIFFERENTIATING BTWN THE 2 TIRES. THIS WOULD STOP A GREAT NUMBER; IF NOT ALL; OF THESE OCCURRENCES.
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.