# NTSB DEN69A0012: Interstate S-1A, N37455, Bitter Creek, WY, September 16, 1968

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: September 16, 1968
- Place: Bitter Creek, WY · BITTER CREEK, WY
- Location: 41.5511° N, 108.5554° W: Placed by OpenAirDocs: center of Bitter Creek, WY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.5511&lon=-108.5554&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal, 2 serious
- Status: Completed, report September 26, 1968
- Report: Brief approved by the director
- NTSB case key (mKey): 108138
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN69A0012
- Page: https://openairdocs.org/ntsb/DEN69A0012

## NTSB brief (aircraft 2)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2443  68/9/16    BITTER CREEK,WYO    INTERSTATE S-1B1    CR-  1  0  0  COMMERCIAL                COMMERCIAL, FL.INSTR.,
        TIME - 1100                    N48100              PX-  0  1  0  OTHER                     AGE 47, 16103 TOTAL
                                       DAMAGE-DESTROYED    OT-  0  1  0                            HOURS, 700 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  IN FLIGHT: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OTHER AIRCRAFT
           PILOT IN COMMAND - DIVERTED ATTENTION FROM OPERATION OF AIRCRAFT
           PERSONNEL - MISCELLANEOUS-PERSONNEL: PILOT OF OTHER AIRCRAFT
           PILOT IN COMMAND - INADEQUATE PREFLIGHT PREPARATION AND/OR PLANNING
         SPECIAL DATA
          SEGMENTS OF AVIATION INVOLVED - SMALL US GEN.AV.-SMALL US GEN.AV.
          CONTROLLING AGENCY - NO CONTROL                          RADAR CTL/SURVEILLANCE - RADAR SERVICE NOT AVAILABLE
          CONTROL ZONE/AREA - NO                                   CONVERGENCE ANGLE-DEGREES -  65
          EVASIVE ACTION TAKEN - UNKNOWN/NOT REPORTED
        REMARKS- N48100 STRUCK LEFT WG,N37455. BOTH PLTS HERDING HORSES.LOW LEVEL FLT,ROLLING TERRAIN.NO RADIO COMM
```

## NTSB brief (aircraft 1)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2443  68/9/16    BITTER CREEK,WYO    INTERSTATE S-1A     CR-  0  1  0  COMMERCIAL                COMMERCIAL, AGE 21, 457
        TIME - 1100                    N37455              PX-  0  0  0  OTHER                     TOTAL HOURS, 300 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  1  1  0                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  IN FLIGHT: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OTHER AIRCRAFT
           PILOT IN COMMAND - DIVERTED ATTENTION FROM OPERATION OF AIRCRAFT
           PERSONNEL - MISCELLANEOUS-PERSONNEL: PILOT OF OTHER AIRCRAFT
           PILOT IN COMMAND - INADEQUATE PREFLIGHT PREPARATION AND/OR PLANNING
         SPECIAL DATA
          SEGMENTS OF AVIATION INVOLVED - SMALL US GEN.AV.-SMALL US GEN.AV.
          CONTROLLING AGENCY - NO CONTROL                          RADAR CTL/SURVEILLANCE - RADAR SERVICE NOT AVAILABLE
          CONTROL ZONE/AREA - NO                                   CONVERGENCE ANGLE-DEGREES -  65
          EVASIVE ACTION TAKEN - UNKNOWN/NOT REPORTED
        REMARKS- N48100 STRUCK LEFT WG,N37455. BOTH PLTS HERDING HORSES.LOW LEVEL FLT,ROLLING TERRAIN.NO RADIO COMM
```

## Aircraft 1

- Registration: [N37455](https://openairdocs.org/deregistered/N37455-1970-12-31), registration cancelled 1970-12-31, S/N 303 (OpenAirDocs)
- Reported make and model: INTERSTATE S-1A
- Registry model: [Interstate S-1A](https://openairdocs.org/model/interstate-s-1a) (registry code 1850202) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

## Aircraft 2

- Registration: [N48100](https://openairdocs.org/deregistered/N48100-2017-04-10), registration cancelled 2017-04-10, S/N 101, built 1943 (OpenAirDocs)
- Reported make and model: INTERSTATE S-1B1
- Registry model: [Interstate S-1B1](https://openairdocs.org/model/interstate-s-1b1) (registry code 1850302) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, 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.

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