# NTSB DCA69A0001: Convair 580, N4634S, Milwaukee, WI, August 4, 1968

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: August 4, 1968
- 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: Fatal
- Injuries: 3 fatal, 1 serious, 11 uninjured
- Status: Completed, report September 4, 1969
- Report: Brief approved by the director
- Safety recommendations: Yes
- NTSB case key (mKey): 79632
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DCA69A0001
- Page: https://openairdocs.org/ntsb/DCA69A0001

## NTSB brief (aircraft 2)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0011   68/8/4    MILWAUKEE,WIS       CESSNA 150          CR-  1  0  0  NONCOMMERCIAL             PRIVATE, AGE 19, 184
        TIME - 0848                    N8742S              PX-  2  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 3 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  1 11                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           PERSONNEL - MISCELLANEOUS-PERSONNEL: PILOT OF OTHER AIRCRAFT
         SPECIAL DATA
          SEGMENTS OF AVIATION INVOLVED - SMALL US GEN.AV.-US AIR CARRIER
          CONTROLLING AGENCY - NO CONTROL                          RADAR CTL/SURVEILLANCE - NOT UNDER RADAR CONTACT
          TRAFFIC ADVISORY ISSUED - NONE                           CONTROLLED/UNCONTROLLED AIRPORT - CONTROLLED AIRPORT
          CONTROL ZONE/AREA - NO                                   CONVERGENCE ANGLE-DEGREES -  42
          EVASIVE ACTION TAKEN - NO
        REMARKS- N4634S STRUCK N8742S IN FLIGHT.
```

## NTSB brief (aircraft 1)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0011   68/8/4    MILWAUKEE,WIS       CONVAIR 580         CR-  0  1  3  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 0848                    N4634S              PX-  0  0  8                            42, 12163 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  3  0  0                            364 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        OPERATOR - NORTH CENTRAL AIRLINES,INC.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  IN FLIGHT: DESCENDING
        PROBABLE CAUSE(S)
           COPILOT - IMPROPER IN-FLIGHT DECISIONS OR PLANNING
           PILOT IN COMMAND - INADEQUATE SUPERVISION OF FLIGHT
           WEATHER - OBSTRUCTIONS TO VISION
           MISCELLANEOUS ACTS,CONDITIONS - WINDSHIELD,DIRTY,FOGGY,ETC.-RESTRICTED VISION
           MISCELLANEOUS - FOREIGN MATERIAL AFFECTING NORMAL OPERATIONS
           MISCELLANEOUS ACTS,CONDITIONS - SUNGLARE
        WEATHER BRIEFING - COMPANY DISPATCH
        WEATHER FORECAST - UNKNOWN/NOT REPORTED
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          BROKEN                                                   UNKNOWN/NOT REPORTED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          4 MILES OR LESS                                          NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TYPE OF WEATHER CONDITIONS
          HAZE                                                     VFR
        TYPE OF FLIGHT PLAN
          IFR
         SPECIAL DATA
          SEGMENTS OF AVIATION INVOLVED - SMALL US GEN.AV.-US AIR CARRIER
          CONTROLLING AGENCY - APPROACH CONTROL LANDING            RADAR CTL/SURVEILLANCE - UNDER RADAR CONTACT
          TRAFFIC ADVISORY ISSUED - BY APPROACH CONTROL            CONTROLLED/UNCONTROLLED AIRPORT - CONTROLLED AIRPORT
          CONTROL ZONE/AREA - NO                                   CONVERGENCE ANGLE-DEGREES -  42
          EVASIVE ACTION TAKEN - NO
        REMARKS- INSECT SMEARS AND METRO CONDS REDUCED VISUAL DETECT CPTY.RARAD ISSUED,CRW DID NOT REQ AVOID VECT.
```

## Aircraft 1

- Registration: N4634S (not matched to a registry record)
- Reported make and model: CONVAIR 580
- Category: Airplane
- Engines: turbo prop
- Damage: Substantial damage

## Aircraft 2

- Registration: [N8742S](https://openairdocs.org/deregistered/N8742S-2019-08-05), registration cancelled 2019-08-05, S/N 15062042, built 1965 (OpenAirDocs)
- Reported make and model: CESSNA 150
- Registry model: [Cessna 150F](https://openairdocs.org/model/cessna-150f) (registry code 2071814) (OpenAirDocs)
- Registry engine: [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series) (registry code 17020, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.