ASN Wikibase Occurrence # 358726
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| Date: | Tuesday 4 July 1995 |
| Time: | 11:03 LT |
| Type: |  Boeing 727-257 |
| Owner/operator: | Northwest Airlines |
| Registration: | N712RC |
| MSN: | 22020/1592 |
| Year of manufacture: | 1980 |
| Engine model: | P&W JT-8-17R |
| Fatalities: | Fatalities: 0 / Occupants: 53 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Las Vegas, NV -
 United States of America
|
| Phase: | Landing |
| Nature: | Unknown |
| Departure airport: | Detroit, MI (KDTW) |
| (KLAS) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
AFTER TOUCHDOWN THE CREW FELT THE AIRCRAFT LURCH TO THE RIGHT. AN INSPECTION REVEALED THAT THE RIGHT MAIN LANDING GEAR OUTER CYLINDER TRUNNION HAD SHEARED AT THE MAIN LANDING GEAR BEAM TRUNNION SUPPORT. THE OPERATOR REPORTED TWO SIMILAR PRIOR INCIDENTS. THE FAILED TRUNNION AND THE TWO FROM THE PRIOR OCCURRENCES WERE SENT TO BOEING FOR DETAILED METALLURGICAL ANALYSIS. ACCORDING TO THE LAB REPORT, ALL THREE TRUNNIONS FAILED AS A RESULT OF A FATIGUE FRACTURE AND STRESS CORROSION WHICH INITIATED IN THE BLENDOUT TRANSITION RADIUS BETWEEN THE MACHINED DOWN TRUNNION JOURNAL AND THE CYLINDER. THE RADIUS WAS FOUND TO BE BELOW THE SPECIFIED MINIMUM AND NICKEL PLATING EXTENDED INTO THE AREA IN EXCESS OF THE LENGTH PERMITTED BY THE OVERHAUL MANUAL. SEVERE THROUGH-THICKNESS CRACKING IN THE CHROME PLATING WAS ALSO FOUND IN ALL THREE TRUNNIONS. ACCORDING TO THE OPERATOR, BOEING 727 LANDING GEAR OVERHAUL REWORK IS PERFORMED IN-HOUSE.
Probable Cause: A shear failure of the right main landing gear outer cylinder trunnion due to fatigue and stress corrosion, and the operator's inadequate and improper overhaul procedures.
Accident investigation:
 |
|
Sources:
NTSB LAX95IA246
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 17:33 | ASN Update Bot | Added |
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