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C182 during a 100 hour check was found to have corrosion and a crack on the right main gear axle fitting.
| Attributes | |
| ACN | 676330 |
| 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 | general aviation : personal |
| Make Model Name | Skylane 182/RG Turbo Skylane/RG |
| Operating Under FAR Part | Part 91 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | other |
| Function | maintenance : lead technician |
| Qualification | technician : airframe technician : inspection authority technician : powerplant |
| Experience | maintenance lead technician : 20 maintenance technician : 9 |
| ASRS Report | 676330 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other other : 1 |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During a 100 hour inspection; noticed some surface corrosion on the main landing gear axle fitting where the aluminum cast fitting mates over the tubular steel landing gear leg. Scraped away bubbled paint to see if it could be cleaned up and treated. Contemplated removing axle fitting to check for corrosion between surfaces but found no procedure in maintenance manual and most likely destructive to the casting to do so. Cleaned off chipped paint in another area at the open end of the landing gear tube/casting area and discovered a 1 inch crack emanating from that end upward. After removing the damaged axle fitting from the gear leg; two fields of corrosion were evident in the casting. One in the area of the crack and one at the underside of the landing gear tube/casting interface. Assembly with a barrier product and application of a fay sealant at dissimilar metal surfaces would aid in reducing ingress of moisture between these parts which caused the corrosion and subsequent cracking. Aircraft approximately 10000 hours operated in coastal environment.
Original NASA ASRS Text
Title: C182 DURING A 100 HR CHK WAS FOUND TO HAVE CORROSION AND A CRACK ON THE R MAIN GEAR AXLE FITTING.
Narrative: DURING A 100 HR INSPECTION; NOTICED SOME SURFACE CORROSION ON THE MAIN LNDG GEAR AXLE FITTING WHERE THE ALUMINUM CAST FITTING MATES OVER THE TUBULAR STEEL LNDG GEAR LEG. SCRAPED AWAY BUBBLED PAINT TO SEE IF IT COULD BE CLEANED UP AND TREATED. CONTEMPLATED REMOVING AXLE FITTING TO CHK FOR CORROSION BTWN SURFACES BUT FOUND NO PROC IN MAINT MANUAL AND MOST LIKELY DESTRUCTIVE TO THE CASTING TO DO SO. CLEANED OFF CHIPPED PAINT IN ANOTHER AREA AT THE OPEN END OF THE LNDG GEAR TUBE/CASTING AREA AND DISCOVERED A 1 INCH CRACK EMANATING FROM THAT END UPWARD. AFTER REMOVING THE DAMAGED AXLE FITTING FROM THE GEAR LEG; TWO FIELDS OF CORROSION WERE EVIDENT IN THE CASTING. ONE IN THE AREA OF THE CRACK AND ONE AT THE UNDERSIDE OF THE LNDG GEAR TUBE/CASTING INTERFACE. ASSEMBLY WITH A BARRIER PRODUCT AND APPLICATION OF A FAY SEALANT AT DISSIMILAR METAL SURFACES WOULD AID IN REDUCING INGRESS OF MOISTURE BTWN THESE PARTS WHICH CAUSED THE CORROSION AND SUBSEQUENT CRACKING. ACFT APPROX 10000 HRS OPERATED IN COASTAL ENVIRONMENT.
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.