# NTSB UNK64X3432: Navion B, N4235K, Thermol, CA, August 16, 1964

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 16, 1964
- Place: Thermol, CA · THERMOL, CA
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report October 28, 1964
- Report: Brief approved by the director
- NTSB case key (mKey): 182490
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=UNK64X3432
- Page: https://openairdocs.org/ntsb/UNK64X3432

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2511  64/8/16    THERMOL CALIF       NAVION B            CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 45, 238
        TIME - 1740                    N4235K              PX-  0  0  3  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 105 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - THERMOL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE                                  TAKEOFF: INITIAL CLIMB
           HARD LANDING                                             LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           POWERPLANT - PROPELLER AND ACCESSORIES: HYDRAULIC PITCH CONTROL MECHANISM
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           MISCELLANEOUS ACTS,CONDITIONS - WINDSHIELD,DIRTY,FOGGY,ETC.-RESTRICTED VISION
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- PROPELLER PITCH CONTROL DIAPHRAM FAILED, OIL COVERED WINDSHIELD.
```

## Aircraft

- Registration: [N4235K](https://openairdocs.org/deregistered/N4235K-2012-06-14), registration cancelled 2012-06-14, S/N NAV-4-1235, built 1948 (OpenAirDocs)
- Reported make and model: NAVION B
- Registry model: [Ryan NAVION](https://openairdocs.org/model/ryan-navion) (registry code 6150160) (OpenAirDocs)
- Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed
- Airport: Thermol

## Other investigations on N4235K (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 LAX80DUG22](https://openairdocs.org/ntsb/LAX80DUG22), Mar 2, 1980: Ryan Navion (N4235K), Wrightwood, CA, 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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