# NTSB IAD76FKW17: Bell 47H1, N13172, Nashville, TN, May 20, 1975

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: May 20, 1975
- Place: Nashville, TN · NASHVILLE, TN
- Location: 36.1659° N, 86.7844° W: Placed by OpenAirDocs: center of Nashville, TN, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.1659&lon=-86.7844&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious
- Status: Completed, report October 28, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 149087
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=IAD76FKW17
- Page: https://openairdocs.org/ntsb/IAD76FKW17

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2734  75/5/20  NR.NASHVILLE,TN       BELL 47H1           CR-  0  2  0  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1115                    N13172              PX-  0  0  0  DUAL                      AGE 28, 3242 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            405 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - CONELIA FORT
        DEPARTURE POINT             INTENDED DESTINATION
         NASHVILLE,TN                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      LANDING: POWER-ON LANDING
           COLLISION WITH GROUND/WATER: CONTROLLED                  LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           ROTORCRAFT - ROTOR ASSEMBLIES: OTHER
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        EMERGENCY CIRCUMSTANCES - FORCED LANDING ON AIRPORT/SEAPLANE BASE/HELIPT.
                                  DIRECTIONAL CONTROL PROBLEM
        REMARKS- TAIL ROTOR HUB BOLT P/N 47-641-052-3 FAILED.BOLT HAD RETIREMENT LIFE 600 HR FAILED AT 499.8 HR.
```

## Aircraft

- Registration: [N13172](https://openairdocs.org/deregistered/N13172-2012-06-21), registration cancelled 2012-06-21, S/N 1348, built 1955 (OpenAirDocs)
- Reported make and model: BELL 47H1
- Registry model: [Bell 47H-1](https://openairdocs.org/model/bell-47h-1) (registry code 1181011) (OpenAirDocs)
- Registry engine: [Franklin 6V4 series](https://openairdocs.org/engine/franklin-6v4-series) (registry code 27033, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Conelia Fort

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19750520011259A](https://openairdocs.org/incident/19750520011259A), May 20, 1975: Bell 47H1, Nashville, TN, Substantial damage. Tail rotor hub bolt p/n 47-641-052-3 failed. Bolt had retirement life 600 hr failed at 499.8 hr.

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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