# NTSB NYC71FHA07: Knudson C JR, N10061, Layton, NJ, July 26, 1970

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 26, 1970
- Place: Layton, NJ · LAYTON, NJ
- Location: 41.2185° N, 74.8235° W: Placed by OpenAirDocs: center of Layton, NJ, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.2185&lon=-74.8235&mi=10
- Phase of flight: [Unknown](https://openairdocs.org/ntsb-phases/990) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report September 23, 1970
- Report: Brief approved by the director
- NTSB case key (mKey): 115868
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC71FHA07
- Page: https://openairdocs.org/ntsb/NYC71FHA07

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0920  70/7/26    LAYTON,NJ           KNUDSON C JR        CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 33, 84 TOTAL
        TIME - 1730                    N10061              PX-  0  0  0  PLEASURE/PERSONAL TRANSP  HOURS, UNK/NR IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          LAYTON,NJ                   LAYTON,NJ
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      UNKNOWN/NOT REPORTED
           HARD LANDING                                             UNKNOWN/NOT REPORTED
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: TAIL ROTOR DRIVE SHAFT ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        REMARKS- JACKSHAFT FROM OUTPUT OF TRANSMISSION TO T/R DRIVG SHAFT FAILED.PLT SUFFERED AMNESIA.NO WITNESSES.
```

## Aircraft

- Registration: [N10061](https://openairdocs.org/deregistered/N10061-1971-11-30), registration cancelled 1971-11-30, S/N 1 (OpenAirDocs)
- Reported make and model: KNUDSON C JR
- Registry model: [Knudsen Commuter JR HI-A](https://openairdocs.org/model/knudsen-commuter-jr-hi-a) (registry code 05602UZ) (OpenAirDocs)
- Category: Helicopter, amateur-built
- 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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