# NTSB CHI92IA101: McDonnell Douglas DC-10-10, N1820U, Chicago, IL, March 3, 1992

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: March 3, 1992, 15:50 local (21:50 UTC)
- Place: Chicago, IL
- Location: 41.9769° N, 87.9081° W: Placed by OpenAirDocs at CHICAGO O'HARE INTL (ORD), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.9769&lon=-87.9081&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 200 uninjured
- Status: Completed, report December 16, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 15324
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI92IA101
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/15324/pdf
- Page: https://openairdocs.org/ntsb/CHI92IA101

## 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.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Airframe/component/system failure/malfunction, landing - roll
  - landing gear,anti-skid brake system - contamination (cause)
  - landing gear,wheel - locked

## Analysis

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.

## Aircraft

- Registration: N1820U (not matched to a registry record)
- Reported make and model: McDonnell Douglas DC-10-10
- Category: Airplane
- Serial number: 46619
- Engines: GE CF6 turbo fan
- Damage: Minor damage
- Flight: Part 121
- Operator: United Airlines
- Registered owner: United Airlines
- Airworthiness certificate: Standard, Transport
- Last inspection: AAIP, January 2, 2000
- Departed: LAX, LOS ANGLES, CA
- Flight plan: IFR
- Airport: ORD, O'Hare Intl, runway 14R, 13,000 × 200 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; airline transport, flight engineer, flight instructor; airplane ratings: multi-engine land; instrument ratings: airplane; medical: class 1, unknown; seat: left; flight hours: 17,000 total, 5,500 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 4 knots
- Visibility: 8 statute miles
- Lowest ceiling: 1,100 ft overcast
- Temperature: 39 °F
- Altimeter: 30.00 inHg
- Observed at: ORD, 1 nm away

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Incident 19920303009739I](https://openairdocs.org/incident/19920303009739I), Mar 3, 1992: Doug DC1010, Chicago, IL. Three tires on left main landing gear blew out on landing rollout.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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