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| Date: | Tuesday 26 June 1984 |
| Time: | 02:35 LT |
| Type: |  McDonnell Douglas DC-8-54 |
| Owner/operator: | United Airlines |
| Registration: | N8048U |
| MSN: | 45881/276 |
| Engine model: | P&W JT3D-3 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Other fatalities: | 0 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Chicago, IL -
 United States of America
|
| Phase: | Landing |
| Nature: | Unknown |
| Departure airport: | Newark, NJ (KEWR) |
| Chicago, IL (KORD) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING THE LANDING ROLL, THE LEFT MAIN GEAR SWIVEL LINK PIN FAILED ALLOWING THE REAR SET OF TIRES TO BECOME DETACHED FROM THE MAIN STRUT AND DRAG ALONG THE RWY. THE LEFT MAIN GEAR BOGIE WAS LAST OVERHAULED IN 1981. AT THE TIME OF FAILURE, IT HAD 4459 HOURS SINCE OVERHAUL. METALLURGICAL STUDY OF THE SWIVEL PIN REVEALED, 1) INTERGRANULAR CRACKING THRU 40% OF PIN CROSS-SECTION, 2) EVIDENCE OF STRESS CORROSION FROM OVERTORQUING THE NUT ON THREADED END OF PIN, 3) TRACES OF COPPER, SOMETIMES USED BEFORE CHROMIUM PLATING DURING OVERHAUL, FOUND IN CRACK, 4) NO OVERLOAD EVIDENCE IN PREEXISTANT CRACK, AND 5) INDICATIONS THAT FINAL FRACTURE WAS DUE TO OVERLOAD.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB CHI84IA264
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 31-Mar-2024 16:01 | ASN Update Bot | Added |
| 17-Oct-2024 17:20 | ASN | Updated [Cn, Other fatalities, Narrative, ] |
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