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A B767-200 incurred a maintenance delay due to #4 main tire replacement caused by maintenance manual confusion over flat spot service limits.
| Attributes | |
| ACN | 532117 |
| Time | |
| Date | 200111 |
| Day | Wed |
| 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 | B767-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 532117 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : company policies non adherence : far non adherence : published procedure |
| Independent Detector | other other : person 1 |
| Resolutory Action | other |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : schedule pressure contributing factor : work cards performance deficiency : installation |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Company Aircraft Chart Or Publication |
| Primary Problem | Chart Or Publication |
Narrative:
On nov/wed/01 I was assigned to assist another technician (#2) on his aircraft nose #xyz. Among the many items on the airplane was a flat spot on the #4 tire. I was given manual reference on the tire svcability with a flat spot. It stated that a flat spot is permissible if it doesn't extend into the ply and the tire is balanced. Although the first criteria was met, my partner and I were unsure how to check the tire balance with a visual inspection. Supervisor #1 told me the tire was within limits but was unwilling to sign for its svcability in the logbook. While supervisor #1 made phone calls, supervisor #2 told technician #2 and I to change the tire because the plane was going to ZZZ1. When technician #2 and I sought relief to take lunch, supervisor #2 accused me of changing a 'questionable' tire, even though he instructed me to change the tire. Throughout this entire episode, I was intimidated by management to dispatch the airplane despite our concerns on the tire balance.
Original NASA ASRS Text
Title: A B767-200 INCURRED A MAINT DELAY DUE TO #4 MAIN TIRE REPLACEMENT CAUSED BY MAINT MANUAL CONFUSION OVER FLAT SPOT SVC LIMITS.
Narrative: ON NOV/WED/01 I WAS ASSIGNED TO ASSIST ANOTHER TECHNICIAN (#2) ON HIS ACFT NOSE #XYZ. AMONG THE MANY ITEMS ON THE AIRPLANE WAS A FLAT SPOT ON THE #4 TIRE. I WAS GIVEN MANUAL REF ON THE TIRE SVCABILITY WITH A FLAT SPOT. IT STATED THAT A FLAT SPOT IS PERMISSIBLE IF IT DOESN'T EXTEND INTO THE PLY AND THE TIRE IS BALANCED. ALTHOUGH THE FIRST CRITERIA WAS MET, MY PARTNER AND I WERE UNSURE HOW TO CHK THE TIRE BAL WITH A VISUAL INSPECTION. SUPVR #1 TOLD ME THE TIRE WAS WITHIN LIMITS BUT WAS UNWILLING TO SIGN FOR ITS SVCABILITY IN THE LOGBOOK. WHILE SUPVR #1 MADE PHONE CALLS, SUPVR #2 TOLD TECHNICIAN #2 AND I TO CHANGE THE TIRE BECAUSE THE PLANE WAS GOING TO ZZZ1. WHEN TECHNICIAN #2 AND I SOUGHT RELIEF TO TAKE LUNCH, SUPVR #2 ACCUSED ME OF CHANGING A 'QUESTIONABLE' TIRE, EVEN THOUGH HE INSTRUCTED ME TO CHANGE THE TIRE. THROUGHOUT THIS ENTIRE EPISODE, I WAS INTIMIDATED BY MGMNT TO DISPATCH THE AIRPLANE DESPITE OUR CONCERNS ON THE TIRE BAL.
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.