# NTSB SEA79DYP32: Grumman G-164A, N25SK, Lewiston, ID, July 3, 1979

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: July 3, 1979
- Place: Lewiston, ID · LEWISTON, ID
- Location: 46.3931° N, 116.9935° W: Placed by OpenAirDocs: center of Lewiston, ID, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=46.3931&lon=-116.9935&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed, report August 17, 1979
- Report: Brief approved by the director
- NTSB case key (mKey): 135623
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA79DYP32
- Page: https://openairdocs.org/ntsb/SEA79DYP32

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1160   79/7/3  NR.LEWISTON,ID        GRUMMAN G-164A      CR-  0  1  0  COMMERCIAL                COMMERCIAL, AGE 22, 2119
        TIME - 0800                    N25SK               PX-  0  0  0  ASSOC CROP CTL ACTIVITY   TOTAL HOURS, 1400 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         LEWISTON,ID                  LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: CONTROLLED                  IN FLIGHT: EN ROUTE TO TREAT CROP
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER IN-FLIGHT DECISIONS OR PLANNING
           PILOT IN COMMAND - MISJUDGED ALTITUDE
        FACTOR(S)
           TERRAIN - HIGH OBSTRUCTIONS
           WEATHER - DOWNDRAFT,UPDRAFTS
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        WEATHER FORECAST - UNKNOWN/NOT REPORTED
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  WIND DIRECTION-DEGREES
          NONE                                                      90
        WIND VELOCITY-KNOTS                                      TYPE OF WEATHER CONDITIONS
           10                                                      VFR
        TYPE OF FLIGHT PLAN
          NONE
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL -  250                       KIND OF OPERATION - SPRAYING CROPS
          KIND OF CROP - PEAS                                      TYPE OF CHEMICAL USED - LIQUID CHEMICAL-TOXIC
          PILOT' S SEAT BELT -UNKNOWN/NOT REPORTED                 GLOVES - USED
          GOGGLES - NOT USED                                       CRASH HELMET - AVAILABLE USED
          COCKPIT CRASHPAD - INSTALLED                             CRASH BAR - INSTALLED
          TANK/HOPPER-LOCATION - FORWARD OF PILOT                  ELEVATION-AREA BEING TREATED-FEET -  2300
```

## Aircraft

- Registration: [N25SK](https://openairdocs.org/deregistered/N25SK-2000-05-02), registration cancelled 2000-05-02, S/N 1335 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164A
- Registry model: [Grumman G-164A](https://openairdocs.org/model/grumman-g-164a) (registry code 3952704) (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 19790703017209A](https://openairdocs.org/incident/19790703017209A), Jul 3, 1979: Gulstm G164A, Lewiston, ID, Substantial damage. Ag pilot enroute to spray area, hit down draft on rim of canyon. Acft hit ground flipped over. Factor unsafe altitu

## Other investigations on N25SK (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 FTW96LA329](https://openairdocs.org/ntsb/FTW96LA329), Jul 31, 1996: Grumman G-164A (N25SK), Burlington, CO, substantial damage. Probable cause: The total loss of engine power resulting from a cracked cylinder. A factor was the unsuitable terrain for the forced landing.
- [NTSB SEA86LA109](https://openairdocs.org/ntsb/SEA86LA109), Apr 23, 1986: Grumman G164-A (N25SK), Echo, OR, 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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