# NTSB FTW77FPG68: Grumman G-164, N4638, Keo, AR, July 21, 1977

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 21, 1977
- Place: Keo, AR · KEO, AR
- Location: 34.6106° N, 92.0136° W: Placed by OpenAirDocs: center of Keo, AR, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=34.6106&lon=-92.0136&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report August 9, 1977
- Report: Brief approved by the director
- NTSB case key (mKey): 146493
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW77FPG68
- Page: https://openairdocs.org/ntsb/FTW77FPG68

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1433  77/7/21    KEO,AR              GRUMMAN G-164       CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 32, 4901
        TIME - 1300                    N4638               PX-  0  0  0  AERIAL APPLICATION        TOTAL HOURS, 2500 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          KEO,AR                      LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: PROCEDURE TURNAROUND
           COLLIDED WITH: FENCE,FENCEPOSTS                          LANDING: ROLL
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: CYLINDER ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        FACTOR(S)
           TERRAIN - HIGH OBSTRUCTIONS
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL - 4886                       KIND OF OPERATION - SPRAYING CROPS
          KIND OF CROP - COTTON                                    TYPE OF CHEMICAL USED - LIQUID CHEMICAL-TOXIC
          PILOT' S SEAT BELT -UNKNOWN/NOT REPORTED                 GLOVES - NOT USED
          GOGGLES - NOT USED                                       CRASH HELMET - AVAILABLE USED
          COCKPIT CRASHPAD - NOT INSTALLED                         CRASH BAR - NOT INSTALLED
          TANK/HOPPER-LOCATION - FORWARD OF PILOT                  TERRAIN-TYPE -LEVEL,FLAT
          ELEVATION-AREA BEING TREATED-FEET -  250                 SWATH RUN-HOW FLOWN - CROSSWIND
          PROCEDURE TURNAROUND - THIRD 1/3 TURN
        REMARKS- NR 8 CYL FAILED.
```

## Aircraft

- Registration: [N4638](https://openairdocs.org/deregistered/N4638-2015-05-13), registration cancelled 2015-05-13, S/N 1071, built 1973 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164
- Registry model: [Grumman G-164A](https://openairdocs.org/model/grumman-g-164a) (registry code 3952704) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- 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 19770721019729A](https://openairdocs.org/incident/19770721019729A), Jul 21, 1977: Grumav G164A, Keo, AR, Substantial damage. Nr 8 cyl failed.

## Other investigations on N4638 (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 CEN12LA491](https://openairdocs.org/ntsb/CEN12LA491), Jul 20, 2012: Grumman G-164A (N4638), Fergus Falls, MN, substantial damage. Probable cause: A total loss of engine power due to a cracked No. 2 cylinder head.
- [NTSB DEN84LA206](https://openairdocs.org/ntsb/DEN84LA206), Jul 1, 1984: Grumman G-164A (N4638), Wyndmere, ND, 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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