# NTSB CHI71IC024: Boeing 727, N7424U, Milwaukee, WI, October 1, 1970

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: October 1, 1970
- Place: Milwaukee, WI · MILWAUKEE, WI
- Location: 43.0389° N, 87.9065° W: Placed by OpenAirDocs: center of Milwaukee, WI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.0389&lon=-87.9065&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 44 uninjured
- Status: Completed, report May 19, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 158804
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI71IC024
- Page: https://openairdocs.org/ntsb/CHI71IC024

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0072   70/10/1 NR.MILWAUKEE,WIS      BOEING 727          CR-  0  0  6  SCHED DOM PASSG SRV       CERTIFICATE UNKNOWN, AGE
        TIME - 0710                    N7424U              PX-  0  0 38                            UNK/NR, UNK/NR TOTAL
                                       DAMAGE-NONE         OT-  0  0  0                            HOURS, UNK/NR IN TYPE,
                                                                                                   UNK/NR INSTRUMENT RATED.
        CLASSIFIED AS INCIDENT
        OPERATOR - UNITED AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          MINNEAPOLIS,MINN            CLEVELAND,OHIO
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           MISCELLANEOUS                                            IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           COPILOT - INCAPACITATION
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
        REMARKS- CO-PLT ILLNESS DIAGNOSED AS SEVERE ACUTE VIRAL GASTROENTEITIS. LND AT CHICAGO OHARE INTL ARPT.
```

## Aircraft

- Registration: [N7424U](https://openairdocs.org/deregistered/N7424U-1996-03-13), registration cancelled 1996-03-13, S/N M4511 (OpenAirDocs)
- Reported make and model: BOEING 727
- Registry model: [Boeing CH47-414](https://openairdocs.org/model/boeing-ch47-414) (registry code 1385060) (OpenAirDocs)
- Category: Airplane
- Engines: turbo fan
- Damage: No damage

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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