# NTSB SEA74DTI18: Bell 47G3B1, N7936S, Conrad, MT, February 24, 1974

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: February 24, 1974
- Place: Conrad, MT · CONRAD, MT
- Location: 48.1741° N, 111.9466° W: Placed by OpenAirDocs: center of Conrad, MT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=48.1741&lon=-111.9466&mi=10
- Phase of flight: [Emergency descent](https://openairdocs.org/ntsb-phases/600) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report April 3, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 186932
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA74DTI18
- Page: https://openairdocs.org/ntsb/SEA74DTI18

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0363  74/2/24    CONRAD,MONT         BELL 47G3B1         CR-  0  0  1  MISCELLANEOUS             COMMERCIAL, AGE 39, 10170
        TIME - 1530                    N7936S              PX-  0  0  1  TEST                      TOTAL HOURS, 2045 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - CONRAD
        DEPARTURE POINT             INTENDED DESTINATION
          CONRAD,MONT                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: AUTOROTATIVE DESCENT
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPER MAINTENANCE (MAINTENANCE PERSONNEL)
           POWERPLANT - ENGINE CONTROLS: THROTTLE-POWER LEVER ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPER ALIGNMENT/ADJUSTMENT
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SIMULATED CONDITIONS
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- IDLE SPEED ADJUSTED TOO LOW. ENG QUIT DRG PRACTICE AUTOROTATIVE LDG. M/R BLADES STRUCK TAIL BOOM.
```

## Aircraft

- Registration: [N7936S](https://openairdocs.org/aircraft/N7936S), registered now, S/N 6600, built 1967 (OpenAirDocs)
- Reported make and model: BELL 47G3B1
- Registry model: [Bell 47G-3B-1](https://openairdocs.org/model/bell-47g-3b-1) (registry code 1181028) (OpenAirDocs)
- Registry engine: [Lycoming TVO-435-GIA](https://openairdocs.org/engine/lycoming-tvo-435-gia) (registry code 41526, turbo-prop) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Conrad

## 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 19740224003669A](https://openairdocs.org/incident/19740224003669A), Feb 24, 1974: Bell 47G3B1, Conrad, MT, Substantial damage. Idle speed adjusted too low. Eng quit drg practice autorotative ldg. M/r blades struck tail boom.

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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