 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B737-300 had the left outboard main landing tire and wheel assembly depart the aircraft. Technician that replaced the tire and wheel assembly believes the axle nut locking ring was installed.
| Attributes | |
| ACN | 679443 |
| Time | |
| Date | 200510 |
| 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 | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 679443 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : installation performance deficiency : inspection performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
I was performing a service check on aircraft X and found #1 and #2 tires worn. I replaced both tires and I don't recall having any problems. I know I installed the locking rings. The only thing I can think of that either the bearing failed or the locking ring failed. I looked up the history on the aircraft and it had not been through a C1 check since the procedure came out on replacing the ring during that check. I don't remember how that ring looked; however. I know there have been other occurrences found to be caused by locking ring failure and it seems there should be a better way to safety the main landing gear nut. Even the nose long gear tires have better safeties installed. Or maybe even a go/no-go stripe on the part of the locking ring that must contact the nut to show a sprung and unsafe condition.
Original NASA ASRS Text
Title: B737-300 HAD THE L OUTBOARD MAIN LNDG TIRE AND WHEEL ASSEMBLY DEPART THE ACFT. TECHNICIAN THAT REPLACED THE TIRE AND WHEEL ASSEMBLY BELIEVES THE AXLE NUT LOCKING RING WAS INSTALLED.
Narrative: I WAS PERFORMING A SVC CHK ON ACFT X AND FOUND #1 AND #2 TIRES WORN. I REPLACED BOTH TIRES AND I DON'T RECALL HAVING ANY PROBS. I KNOW I INSTALLED THE LOCKING RINGS. THE ONLY THING I CAN THINK OF THAT EITHER THE BEARING FAILED OR THE LOCKING RING FAILED. I LOOKED UP THE HISTORY ON THE ACFT AND IT HAD NOT BEEN THROUGH A C1 CHK SINCE THE PROC CAME OUT ON REPLACING THE RING DURING THAT CHK. I DON'T REMEMBER HOW THAT RING LOOKED; HOWEVER. I KNOW THERE HAVE BEEN OTHER OCCURRENCES FOUND TO BE CAUSED BY LOCKING RING FAILURE AND IT SEEMS THERE SHOULD BE A BETTER WAY TO SAFETY THE MAIN LNDG GEAR NUT. EVEN THE NOSE LONG GEAR TIRES HAVE BETTER SAFETIES INSTALLED. OR MAYBE EVEN A GO/NO-GO STRIPE ON THE PART OF THE LOCKING RING THAT MUST CONTACT THE NUT TO SHOW A SPRUNG AND UNSAFE CONDITION.
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.