# NTSB CHI75DEP24: Boeing A75, N55898, Lone Rock, WI, September 8, 1974

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: September 8, 1974
- Place: Lone Rock, WI · LONE ROCK, WI
- Location: 43.1857° N, 90.2013° W: Placed by OpenAirDocs: center of Lone Rock, WI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.1857&lon=-90.2013&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report December 10, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 138742
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI75DEP24
- Page: https://openairdocs.org/ntsb/CHI75DEP24

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3469   74/9/8    LONE ROCK,WIS       BOEING A75          CR-  0  0  1  COMMERCIAL                COMMERCIAL, FL.INSTR.,
        TIME - 0900                    N55898              PX-  0  0  0  AERIAL APPLICATION        AGE 35, 2400 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            60 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - TRI-COUNTY
        DEPARTURE POINT             INTENDED DESTINATION
          LONE ROCK,WIS               LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLIDED WITH: CROP                                      IN FLIGHT: SWATH RUN
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - DIVERTED ATTENTION FROM OPERATION OF AIRCRAFT
           PILOT IN COMMAND - MISJUDGED CLEARANCE
        FACTOR(S)
           TERRAIN - HIGH VEGETATION
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL -   60                       KIND OF OPERATION - FERTILIZING (LIQUID)
          KIND OF CROP - POTATOES                                  TYPE OF CHEMICAL USED - LIQUID CHEMICAL-NONTOXIC
          PILOT' S SEAT BELT -FASTENED-PROPERLY                    GLOVES - USED
          GOGGLES - USED                                           CRASH HELMET - AVAILABLE USED
          COCKPIT CRASHPAD - NOT INSTALLED                         CRASH BAR - INSTALLED
          TANK/HOPPER-LOCATION - FORWARD OF PILOT                  TERRAIN-TYPE -LEVEL,FLAT
          ELEVATION-AREA BEING TREATED-FEET -  700                 SWATH RUN-HOW FLOWN - WIND CALM
        REMARKS- PLT LOOKING BACK AT SPRAY BOOM.
```

## Aircraft

- Registration: [N55898](https://openairdocs.org/deregistered/N55898-2012-08-27), registration cancelled 2012-08-27, S/N 75-424, built 1940 (OpenAirDocs)
- Reported make and model: BOEING A75
- Registry model: [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17) (registry code 1380134) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Tri-County

## 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 19740908034859A](https://openairdocs.org/incident/19740908034859A), Sep 8, 1974: Boeing A75N1, Lone Rock, WI, Substantial damage. Plt looking back at spray boom.

## Other investigations on N55898 (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 CHI76DEP06](https://openairdocs.org/ntsb/CHI76DEP06), Jul 22, 1975: Stearman A75N1 (N55898), Alma Center, WI, substantial 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.

---
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.