# NTSB CHI69F0088: Hiller UH-12D, N10321, Muskegon, MI, June 28, 1968

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 28, 1968
- Place: Muskegon, MI · MUSKEGON, MI
- Location: 43.2265° N, 86.2572° W: Placed by OpenAirDocs: center of Muskegon, MI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.2265&lon=-86.2572&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report September 6, 1968
- Report: Brief approved by the director
- NTSB case key (mKey): 109932
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI69F0088
- Page: https://openairdocs.org/ntsb/CHI69F0088

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2101  68/6/28    MUSKEGON,MICH       HILLER UH-12D       CR-  0  0  1  MISCELLANEOUS             COMMERCIAL, FL.INSTR.,
        TIME - 1045                    N10321              PX-  0  0  0  TEST                      AGE 42, 2586 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            0 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - MUSKEGON COUNTY
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           HARD LANDING                                             LANDING: POWER-ON LANDING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - ATTEMPTED OPERATION BEYOND EXPERIENCE/ABILITY LEVEL
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        FACTOR(S)
           PILOT IN COMMAND - ATTEMPTED OPERATION W/KNOWN DEFICIENCIES IN EQUIPMENT
           ROTORCRAFT - ROTOR ASSEMBLIES: MAIN ROTOR BLADES
           MISCELLANEOUS ACTS,CONDITIONS - VIBRATION,EXCESSIVE
        REMARKS- TOTAL ROTORCRAFT TIME 3HRS.VIBRATION DUE TO HEAVY BLADE FROM BEING IN STORAGE.
```

## Aircraft

- Registration: N10321 (not matched to a registry record)
- Reported make and model: HILLER UH-12D
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Muskegon County

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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