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A learjet 31A was discovered during a brake change to have the main wheel assemblies put together incorrectly.
| Attributes | |
| ACN | 643379 |
| Time | |
| Date | 200501 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air taxi |
| Make Model Name | Learjet 31 |
| Flight Phase | ground : parked |
| Person 1 | |
| Affiliation | company : air taxi |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 8 |
| ASRS Report | 643379 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | oversight : coordinator |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure non adherence : company policies |
| Independent Detector | other other : 3 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : work cards contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : training performance deficiency : unqualified personnel performance deficiency : non compliance with legal requirements performance deficiency : installation |
| Supplementary | |
| Problem Areas | Chart Or Publication Maintenance Human Performance Environmental Factor Company Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
I assembled 4 main wheel assemblies for installation on a learjet 31A per the maintenance manual. Tires were installed on the aircraft on dec/fri/04 without incident by myself and signed off by my director of maintenance. On jan/fri/05 while the flight crew was doing a walkaround; they found #3 brake worn to limits and #4 brake leaking. The maintenance controller that removed the tires noticed that the tires were offset by 1 hole. Upon further inspection; the contractor found another wheel half on the other side offset 1 hole as well. All 4 tires were disassembled; non destructive tested; and assembled per maintenance manual; and installed on the aircraft. This was the first time assembling wheel assemblies for a learjet 1A. When I got hired by the employer just over 3 months ago; they stated that I would be sent to approved aircraft schools. I contribute this to my lack of asking if everything looked ok; but also to the lack of training and supervision. Callback conversation with reporter revealed the following information: the reporter stated the problem was the location of the inflation valve stem as it related to the blowout disks or fuse plugs. No training was received or any help given on this tire and wheel assembly job.
Original NASA ASRS Text
Title: A LEARJET 31A WAS DISCOVERED DURING A BRAKE CHANGE TO HAVE THE MAIN WHEEL ASSEMBLIES PUT TOGETHER INCORRECTLY.
Narrative: I ASSEMBLED 4 MAIN WHEEL ASSEMBLIES FOR INSTALLATION ON A LEARJET 31A PER THE MAINT MANUAL. TIRES WERE INSTALLED ON THE ACFT ON DEC/FRI/04 WITHOUT INCIDENT BY MYSELF AND SIGNED OFF BY MY DIRECTOR OF MAINT. ON JAN/FRI/05 WHILE THE FLT CREW WAS DOING A WALKAROUND; THEY FOUND #3 BRAKE WORN TO LIMITS AND #4 BRAKE LEAKING. THE MAINT CTLR THAT REMOVED THE TIRES NOTICED THAT THE TIRES WERE OFFSET BY 1 HOLE. UPON FURTHER INSPECTION; THE CONTRACTOR FOUND ANOTHER WHEEL HALF ON THE OTHER SIDE OFFSET 1 HOLE AS WELL. ALL 4 TIRES WERE DISASSEMBLED; NON DESTRUCTIVE TESTED; AND ASSEMBLED PER MAINT MANUAL; AND INSTALLED ON THE ACFT. THIS WAS THE FIRST TIME ASSEMBLING WHEEL ASSEMBLIES FOR A LEARJET 1A. WHEN I GOT HIRED BY THE EMPLOYER JUST OVER 3 MONTHS AGO; THEY STATED THAT I WOULD BE SENT TO APPROVED ACFT SCHOOLS. I CONTRIBUTE THIS TO MY LACK OF ASKING IF EVERYTHING LOOKED OK; BUT ALSO TO THE LACK OF TRAINING AND SUPERVISION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE PROB WAS THE LOCATION OF THE INFLATION VALVE STEM AS IT RELATED TO THE BLOWOUT DISKS OR FUSE PLUGS. NO TRAINING WAS RECEIVED OR ANY HELP GIVEN ON THIS TIRE AND WHEEL ASSEMBLY JOB.
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.