# NTSB UNK64X1268: Hiller OH5A, N81007, Mammoth Lakes, CA, April 11, 1964

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: April 11, 1964
- Place: Mammoth Lakes, CA · MAMMOTH LAKES, CA
- Location: 37.6244° N, 118.9884° W: Placed by OpenAirDocs: center of Mammoth Lakes, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.6244&lon=-118.9884&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 1 uninjured
- Status: Completed, report January 8, 1964
- Report: Brief approved by the director
- NTSB case key (mKey): 184855
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=UNK64X1268
- Page: https://openairdocs.org/ntsb/UNK64X1268

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0114  64/4/11    MAMMOTH LAKES CAL   HILLER OH5A         CR-  0  1  1  MISCELLANEOUS             COMMERCIAL, FL.INSTR.,
        TIME - 0800                    N81007              PX-  0  0  0  TEST                      AGE 41, 7000 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            300 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - LONG VALLEY
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
           GEAR COLLAPSED                                           LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SIMULATED CONDITIONS
```

## Aircraft

- Registration: [N81007](https://openairdocs.org/deregistered/N81007-1970-06-29), registration cancelled 1970-06-29, S/N 3 (OpenAirDocs)
- Reported make and model: HILLER OH5A
- Registry model: [Hiller OH-5A](https://openairdocs.org/model/hiller-oh-5a) (registry code 4360302) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Long Valley

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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