# NTSB CHI79FA047: Douglas DC-9, N941N, Mosinee, WI, April 21, 1979

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: April 21, 1979
- Place: Mosinee, WI · MOSINEE, WI
- Location: 44.7918° N, 89.6843° W: Placed by OpenAirDocs: center of Mosinee, WI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.7918&lon=-89.6843&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 41 uninjured
- Status: Completed, report May 7, 1980
- Report: Brief approved by the director
- NTSB case key (mKey): 136500
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI79FA047
- Page: https://openairdocs.org/ntsb/CHI79FA047

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0020  79/4/21    MOSINEE,WI          DOUGLAS DC-9        CR-  0  0  4  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 0132                    N941N               PX-  0  0 37                            50, 19838 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            2530 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - CENTRAL WISCONSIN
        OPERATOR - NORTH CENTRAL AIRLINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          MILWAUKEE,WI                MOSINEE,WI
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           DRAGGED WINGTIP,POD,OR FLOAT                             LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           COPILOT - IMPROPER OPERATION OF FLIGHT CONTROLS
           PILOT IN COMMAND - INADEQUATE SUPERVISION OF FLIGHT
        FACTOR(S)
           WEATHER - UNFAVORABLE WIND CONDITIONS
           MISCELLANEOUS ACTS,CONDITIONS - NOT ALIGNED WITH RUNWAY/INTENDED LANDING AREA
        WEATHER BRIEFING - COMPANY DISPATCH
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          OVERCAST                                                  500
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  RELATIVE BEARING OF WIND
          NONE                                                     LEFT QUARTERING TAIL WIND 203-247 DEGREES
        TEMPERATURE-F                                            WIND DIRECTION-DEGREES
           45                                                      295
        WIND VELOCITY-KNOTS                                      TYPE OF WEATHER CONDITIONS
           10                                                      IFR
        TYPE OF FLIGHT PLAN
          IFR
        REMARKS- WND GUSTING APRX 15KTS.
```

## Aircraft

- Registration: [N941N](https://openairdocs.org/deregistered/N941N-2009-07-29), registration cancelled 2009-07-29, S/N 47450, built 1969 (OpenAirDocs)
- Reported make and model: DOUGLAS DC-9
- Registry model: [Mcdonnell Douglas DC-9-32](https://openairdocs.org/model/mcdonnell-douglas-dc-9-32) (registry code 302206C) (OpenAirDocs)
- Registry engine: [Pratt & Whitney JT8D-5](https://openairdocs.org/engine/pratt-whitney-jt8d-5) (registry code 52046, turbo-jet) (OpenAirDocs)
- Category: Airplane
- Engines: turbo jet
- Damage: Substantial damage
- Airport: Central Wisconsin

## Other investigations on N941N (1)

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.

- [NTSB CHI02FA289](https://openairdocs.org/ntsb/CHI02FA289), Sep 22, 2002: McDonnell Douglas DC-9-32 (N941N), Minneapolis, MN, substantial damage. Probable cause: The fatigue failure of the main landing gear strut due to inclusions in the material, residual stresses, and dissolved hydrogen content.

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.