# NTSB CHI77FEC47: Bell 47B3, N1575, Lake Orion, MI, September 18, 1977

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: September 18, 1977
- Place: Lake Orion, MI · LAKE ORION, MI
- Location: 42.7842° N, 83.2455° W: Placed by OpenAirDocs: center of Lake Orion, MI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.7842&lon=-83.2455&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor, 1 uninjured
- Status: Completed, report November 21, 1977
- Report: Brief approved by the director
- NTSB case key (mKey): 145292
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI77FEC47
- Page: https://openairdocs.org/ntsb/CHI77FEC47

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3149  77/9/18    LAKE ORION, MI      BELL 47B3           CR-  0  0  1  MISCELLANEOUS             COMMERCIAL, AGE 44, 600
        TIME - 1515                    N1575               PX-  0  0  2  OTHER PUBLIC              TOTAL HOURS, 365 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          LAKE ORION, MI              LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: CONTROLLED                  TAKEOFF: RUNNING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
           PILOT IN COMMAND - MISJUDGED ALTITUDE AND CLEARANCE
```

## Aircraft

- Registration: [N1575](https://openairdocs.org/deregistered/N1575-2018-02-08), registration cancelled 2018-02-08, S/N 57 (OpenAirDocs)
- Reported make and model: BELL 47B3
- Registry model: [Bell 47B3](https://openairdocs.org/model/bell-47b3) (registry code 1180606) (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

## 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 19770918032919A](https://openairdocs.org/incident/19770918032919A), Sep 18, 1977: Bell 47B3, Lake Orion, MI, Substantial damage

## Other investigations on N1575 (4)

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.

- [NTSB DFW06CA055](https://openairdocs.org/ntsb/DFW06CA055), Jan 13, 2006: Bell 47-B3 (N1575), Dennison, TX, substantial damage. Probable cause: The in-flight separation of the stabilizer bar tube.
- [NTSB FTW01LA087](https://openairdocs.org/ntsb/FTW01LA087), Mar 22, 2001: Bell 47G2 (N1575), Ardmore, OK, substantial damage. Probable cause: the loss of tail rotor control during maneuvering resultant from the failure of the tail rotor drive shaft coupling due to a stripped thread which allowed the grease lubricating the shaft to leak…
- [NTSB FTW98LA400](https://openairdocs.org/ntsb/FTW98LA400), Sep 17, 1998: Bell 47-G-2 (N1575), Ardmore, OK, substantial damage. Probable cause: The pilots failure to maintain clearance with terrain and the ensuing loss of control.
- [NTSB CHI70FDW10](https://openairdocs.org/ntsb/CHI70FDW10), Mar 27, 1970: Bell 47G (N1575), Port Huron, MI, substantial damage

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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