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NTSB Report
June 26, 1984 · Mcdonnell Douglas DC-8-54 · N8048U
Chicago, IL
Overview
Report Status
Preliminary report
Event Type
Incident
Date
June 26, 1984
Injury Outcomes
No injuries (3 uninjured)
Location
Chicago, IL
Aircraft
Mcdonnell Douglas DC-8-54
Tail Number
N8048U
Injuries
None
Aircraft Damage
Minor
NTSB Number
CHI84IA264
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.
Full Narrative
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.
Flight
Event TypeIncident
Event Time02:35 CDT
Nearest AirportO'Hare (0nm N)
Runway14R
Runway Length11600 ft
Runway Width200 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMcdonnell Douglas DC-8-54
Tail NumberN8048U
Aircraft CategoryAir
DamageMinor
Operating RulePart 121
Engines4
Engine TypeTurbofan
Engine DetailsP&W · JT3D-3 · Turbofan · 18000
Seats5
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1First Class
Conditions
ConditionsVMC
LightDark Night
Wind220° @ 5 kt
Visibility15 sm
CeilingBroken clouds 10000 ft
Temperature / Dew Point66 F / 64 F
Altimeter29.00 inHg
Observation Time07:04
Weather SourceWFAC