# NTSB SEA74DYA17: Bell 47G-3B, N8588F, Twin Falls, ID, December 17, 1973

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: December 17, 1973
- Place: Twin Falls, ID · TWIN FALLS, ID
- Location: 42.5641° N, 114.4609° W: Placed by OpenAirDocs: center of Twin Falls, ID, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.5641&lon=-114.4609&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report February 13, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 187426
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA74DYA17
- Page: https://openairdocs.org/ntsb/SEA74DYA17

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4035  73/12/17   TWIN FALLS,ID       BELL 47G-3B         CR-  0  0  2  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1055                    N8588F              PX-  0  0  0  DUAL                      AGE 42, 4416 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            1776 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - TWIN FALLS CITY
        DEPARTURE POINT             INTENDED DESTINATION
          TWIN FALLS,ID               LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           DUAL STUDENT - FAILED TO MAINTAIN ADEQUATE ROTOR R.P.M.
           DUAL STUDENT - IMPROPER OPERATION OF FLIGHT CONTROLS
           PILOT IN COMMAND - INADEQUATE SUPERVISION OF FLIGHT
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SIMULATED CONDITIONS
        REMARKS- STUD PRCTCNG PWR OFF AUTOROT. INSTR LVL HELO AFTCYCLIC,DID NOT CK RTR RPM. SURF SFT DRT,GRSS.
```

## Aircraft

- Registration: N8588F (not matched to a registry record)
- Reported make and model: BELL 47G-3B
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Twin Falls City

## 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 19731217038399A](https://openairdocs.org/incident/19731217038399A), Dec 17, 1973: Bell 47G3B1, Twin Falls, ID, Substantial damage. Stud prctcng pwr off autorot. Instr lvl helo aftcyclic,did not ck rtr RPM. Surf sft drt,grss.

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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