# NTSB CHI77FEK33: Bell 47G-2A, N9526, Big Plaines, OH, September 28, 1977

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: September 28, 1977
- Place: Big Plaines, OH · BIG PLAINES, OH
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report November 17, 1977
- Report: Brief approved by the director
- NTSB case key (mKey): 145160
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI77FEK33
- Page: https://openairdocs.org/ntsb/CHI77FEK33

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2634  77/9/28    BIG PLAINES,OH      BELL 47G-2A         CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 31, 3800
        TIME - 1430                    N9526               PX-  0  0  0  AERIAL APPLICATION        TOTAL HOURS, 500 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          CIRCLEVILLE,OH              BIG PLAINES,OH
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: PROCEDURE TURNAROUND
           HARD LANDING                                             LANDING: POWER-ON LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - COOLING SYSTEM: OTHER
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL -  475                       KIND OF OPERATION - DEFOLIATION (LIQUID)
          KIND OF CROP - BEANS                                     TYPE OF CHEMICAL USED - LIQUID CHEMICAL-TOXIC
          PILOT' S SEAT BELT -FASTENED-PROPERLY                    GLOVES - USED
          GOGGLES - USED                                           CRASH HELMET - AVAILABLE USED
          COCKPIT CRASHPAD - NOT INSTALLED                         CRASH BAR - NOT INSTALLED
          TANK/HOPPER-LOCATION - SIDES                             TERRAIN-TYPE -LEVEL,FLAT
          ELEVATION-AREA BEING TREATED-FEET -  700                 SWATH RUN-HOW FLOWN - CROSSWIND
          PROCEDURE TURNAROUND - SECOND 1/3 TURN
        REMARKS- COOLING FAN DAMAGED WHEN RETAINING NUT BACKED OFF.
```

## Aircraft

- Registration: [N9526](https://openairdocs.org/aircraft/N9526), registered now, S/N 1288-16, built 1954 (OpenAirDocs)
- Reported make and model: BELL 47G-2A
- Registry model: [Bell 47G-2A](https://openairdocs.org/model/bell-47g-2a) (registry code 1181012) (OpenAirDocs)
- Registry engine: [Lycoming VO-540 series](https://openairdocs.org/engine/lycoming-vo-540-series) (registry code 41534, reciprocating) (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 19770928028759A](https://openairdocs.org/incident/19770928028759A), Sep 28, 1977: Bell 47G2A, Big Plaines, OH, Substantial damage. Cooling fan damaged when retaining nut backed off.

## Other investigations on N9526 (2)

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 ERA17LA285](https://openairdocs.org/ntsb/ERA17LA285), Aug 20, 2017: Bell 47G (N9526), St Marys, PA, substantial damage. Probable cause: The student pilot's inadequate prefight planning and en route fuel management, which resulted in fuel exhaustion and a total loss of engine power.
- [NTSB CEN09CA517](https://openairdocs.org/ntsb/CEN09CA517), Aug 11, 2009: Bell 47G-2A (N9526), Covert, MI, substantial damage. Probable cause: A loss of engine power due to fuel starvation as a result of blocked fuel vents.

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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