# NTSB CHI72AC008: Boeing 747, N4713U, Chicago, IL, July 23, 1971

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: July 23, 1971
- Place: Chicago, IL · CHICAGO, IL
- Location: 41.8500° N, 87.6501° W: Placed by OpenAirDocs: center of Chicago, IL, within about 9 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.8500&lon=-87.6501&mi=10
- Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 4 minor, 194 uninjured
- Status: Completed, report January 3, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 161218
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI72AC008
- Page: https://openairdocs.org/ntsb/CHI72AC008

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0017  71/7/23    CHICAGO,ILL         BOEING 747          CR-  0  0 15  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 1305                    N4713U              PX-  0  1183                            57, 25956 TOTAL HOURS,
                                       DAMAGE-MINOR        OT-  0  0  0                            172 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - OHARE INTL
        OPERATOR - UNITED AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          LOS ANGELES,CALIF           CHICAGO,ILL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            TAXI: FROM LANDING
           FIRE OR EXPLOSION: ON GROUND                             TAXI: FROM LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - THRUST REVERSER: OTHER
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           MISCELLANEOUS ACTS,CONDITIONS - OVERHEATED
           PILOT IN COMMAND - FAILED TO FOLLOW APPROVED PROCEDURES,DIRECTIVES,ETC.
           MISCELLANEOUS ACTS,CONDITIONS - FIRE IN ENGINE
        REMARKS- NR 2 ENG STAYED IN REVERSE.OHEATED NR 1 AND 2 ENGS.CREW FAILED TO DETECT.PAX INJ DURING EVAC.
```

## Aircraft

- Registration: N4713U (not matched to a registry record)
- Reported make and model: BOEING 747
- Category: Airplane
- Engines: turbo fan
- Damage: Minor damage
- Airport: Ohare Intl

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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