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NTSB Report
March 3, 1992 · Mcdonnell Douglas DC-10-10 · N1820U
Chicago, IL
Overview
Report Status
Probable Cause
Event Type
Incident
Date
March 3, 1992
Injury Outcomes
No injuries (200 uninjured)
Location
Chicago, IL
Aircraft
Mcdonnell Douglas DC-10-10
Tail Number
N1820U
Operator
United Airlines
Injuries
None
Aircraft Damage
Minor
NTSB Number
CHI92IA101
DURING ROLLOUT, THE CAPTAIN APPLIED BRAKES TO DECELERATE THE AIRPLANE AS IT WAS TURNING TOWARDS THE TAXIWAY. THE AIRPLANE'S LEFT MAIN LANDING GEAR BRAKES, WHICH ARE NORMALLY PROTECTED BY A BRAKE ANTI-SKID SYSTEM, LOCKED THREE OF THE FOUR WHEELS SUFFICIENTLY SO THAT THE TIRES WERE SCRUBBED DOWN AND RUPTURED. THE FOURTH TIRE WAS SCRUBBED DOWN AND DEFLATED. THE CAPTAIN STOPPED THE AIRPLANE PRIOR TO ENTERING THE TAXIWAY. POST-INCIDENT INSPECTION REVEALED CONTAMINATED ELECTRICAL CONNECTORS BETWEEN THE ANTI-SKID MANIFOLDS AND THE ANTI-SKID COMPUTER RESULTING IN THE LOSS OF ANTI-SKID PROTECTION.
NTSB Probable Cause
CONTAMINATED ANTI-SKID BRAKING SYSTEM ELECTRICAL CONNECTORS WHICH RESULTED IN A PARTIAL LOSS OF THE ANTI-SKID SYSTEM AND LOCKING UP OF THE BRAKES ON THE LEFT MAIN GEAR.
Full Narrative
DURING ROLLOUT, THE CAPTAIN APPLIED BRAKES TO DECELERATE THE AIRPLANE AS IT WAS TURNING TOWARDS THE TAXIWAY. THE AIRPLANE'S LEFT MAIN LANDING GEAR BRAKES, WHICH ARE NORMALLY PROTECTED BY A BRAKE ANTI-SKID SYSTEM, LOCKED THREE OF THE FOUR WHEELS SUFFICIENTLY SO THAT THE TIRES WERE SCRUBBED DOWN AND RUPTURED. THE FOURTH TIRE WAS SCRUBBED DOWN AND DEFLATED. THE CAPTAIN STOPPED THE AIRPLANE PRIOR TO ENTERING THE TAXIWAY. POST-INCIDENT INSPECTION REVEALED CONTAMINATED ELECTRICAL CONNECTORS BETWEEN THE ANTI-SKID MANIFOLDS AND THE ANTI-SKID COMPUTER RESULTING IN THE LOSS OF ANTI-SKID PROTECTION.
Flight
Event TypeIncident
Event Time15:50 CST
Nearest AirportO'Hare Intl (0nm)
Runway14R
Runway Length13000 ft
Runway Width200 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMcdonnell Douglas DC-10-10
Tail NumberN1820U
Aircraft CategoryAir
DamageMinor
OperatorUnited Airlines
Operating RulePart 121
Engines3
Engine TypeTurbofan
Engine DetailsGe · CF6 · Turbofan
People & Injuries
Injury SummaryNo injuries (200 uninjured)
Fatal0
Serious0
Minor0
Uninjured200
Total200
Crew 1First Class
Conditions
ConditionsVMC
LightDaylight
Wind270° @ 4 kt
Visibility8 sm
CeilingOvercast 1100 ft
Temperature / Dew Point39 C / 0 C
Altimeter30.00 inHg
Observation Time21:50
Weather SourceWFAC