# NTSB DIA68D0123: Sierradyne S-1, N12K, Langley Afb, VA, November 24, 1967

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: November 24, 1967
- Place: Langley Afb, VA · LANGLEY AFB, VA
- Location: 37.0828° N, 76.3620° W: Placed by OpenAirDocs: center of Langley Air Force Base, VA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.0828&lon=-76.3620&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report January 18, 1968
- Report: Brief approved by the director
- NTSB case key (mKey): 112953
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DIA68D0123
- Page: https://openairdocs.org/ntsb/DIA68D0123

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4206  67/11/24   LANGLEY AFB,VA      SIERRADYNE S-1      CR-  0  0  1  MISCELLANEOUS             COMMERCIAL, AGE 44, 3300
        TIME - 1617                    N12K                PX-  0  0  0  DEMONSTRATION             TOTAL HOURS, 1 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        NAME OF AIRPORT - LANGLEY AFB
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GROUND-WATER LOOP-SWERVE                                 LANDING: ROLL
           GEAR COLLAPSED                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF BRAKES AND/OR FLIGHT CONTROLS
        FACTOR(S)
           PILOT IN COMMAND - LACK OF FAMILIARITY WITH AIRCRAFT
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
```

## Aircraft

- Registration: [N12K](https://openairdocs.org/deregistered/N12K-2014-09-03), registration cancelled 2014-09-03, S/N 1, built 1953 (OpenAirDocs)
- Reported make and model: SIERRADYNE S-1
- Registry model: [Sierra S-1](https://openairdocs.org/model/sierra-s-1) (registry code 056010S) (OpenAirDocs)
- Registry engine: [Continental C85 series](https://openairdocs.org/engine/continental-c85-series) (registry code 17008, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Langley Afb

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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