# NTSB CHI80FEP31: Tomcat MARK5A, N19JM, Stockbridge, WI, May 23, 1980

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: May 23, 1980
- Place: Stockbridge, WI · STOCKBRIDGE, WI
- Location: 44.0684° N, 88.3097° W: Placed by OpenAirDocs: center of Stockbridge, WI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.0684&lon=-88.3097&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed, report February 18, 1981
- Report: Brief approved by the director
- NTSB case key (mKey): 130609
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI80FEP31
- Page: https://openairdocs.org/ntsb/CHI80FEP31

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3453  80/5/23    STOCKBRIDGE,WI      TOMCAT MARK5A       CR-  0  1  0  COMMERCIAL                COMMERCIAL, AGE 45, 3095
        TIME - 1110                    N19JM               PX-  0  0  0  ASSOC CROP CTL ACTIVITY   TOTAL HOURS, 788 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          STOCKBRIDGE,WI              LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      IN FLIGHT: EN ROUTE TO TREAT CROP
           HARD LANDING                                             LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: TAIL ROTOR DRIVE SHAFT ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
                                  LATERAL CONTROL PROBLEM
                                  DIRECTIONAL CONTROL PROBLEM
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL - 2284                       KIND OF OPERATION - SPRAYING CROPS
          KIND OF CROP - PEAS                                      TYPE OF CHEMICAL USED - LIQUID CHEMICAL-NONTOXIC
          PILOT' S SEAT BELT -FASTENED-PROPERLY                    GLOVES - NOT USED
          GOGGLES - NOT USED                                       CRASH HELMET - AVAILABLE USED
          COCKPIT CRASHPAD - INSTALLED                             CRASH BAR - INSTALLED
          TANK/HOPPER-LOCATION - SIDES                             TERRAIN-TYPE -LEVEL,FLAT
          ELEVATION-AREA BEING TREATED-FEET -  500                 SWATH RUN-HOW FLOWN - WIND CALM
        REMARKS- TAIL ROTOR DRIVE SHAFT,P/N 476441729,FAILED 29IN FM END OF SPLINE THAT DRIVES T/R.
```

## Aircraft

- Registration: N19JM (not matched to a registry record)
- Reported make and model: TOMCAT MARK5A
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## FAA reports on this event (1)

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

- [Accident 19800523014739A](https://openairdocs.org/incident/19800523014739A), May 23, 1980: Bell OH13HMK5A, Stockbridge, WI, Substantial damage. Tail rotor drive shaft broke. Resulted in uncontrolled helicopter rotation to ground impact.

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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