# NTSB SEA79DYM37: Aero Comdr S2R, N4999X, Helix, OR, May 25, 1979

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: May 25, 1979
- Place: Helix, OR · HELIX, OR
- Location: 45.8507° N, 118.6591° W: Placed by OpenAirDocs: center of Helix, OR, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=45.8507&lon=-118.6591&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report July 30, 1979
- Report: Brief approved by the director
- NTSB case key (mKey): 135700
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA79DYM37
- Page: https://openairdocs.org/ntsb/SEA79DYM37

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1206  79/5/25  NR.HELIX,OR           AERO COMDR S2R      CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 58, 10400
        TIME - 1045                    N4999X              PX-  0  0  0  AERIAL APPLICATION        TOTAL HOURS, 1418 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          PENDLETON,OR                LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: PULLUP FROM SWATH RUN
           GEAR COLLAPSED                                           LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: CYLINDER ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        FACTOR(S)
           TERRAIN - ROUGH/UNEVEN
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL - UNKNOWN/NOT REPORTED       KIND OF OPERATION - SPRAYING CROPS
          KIND OF CROP - GRAIN FIELDS                              TYPE OF CHEMICAL USED - LIQUID CHEMICAL-NONTOXIC
          PILOT' S SEAT BELT -UNKNOWN/NOT REPORTED                 GLOVES - NOT USED
          GOGGLES - USED                                           CRASH HELMET - AVAILABLE USED
          COCKPIT CRASHPAD - INSTALLED                             CRASH BAR - INSTALLED
          TANK/HOPPER-LOCATION - FORWARD OF PILOT                  TERRAIN-TYPE -ROLLING
          ELEVATION-AREA BEING TREATED-FEET -  1500                SWATH RUN-HOW FLOWN - WIND CALM
        REMARKS- NR 2 CYL HEAD ROCKER BOSS FAILED.
```

## Aircraft

- Registration: [N4999X](https://openairdocs.org/aircraft/N4999X), registered now, S/N 2136R, built 1975 (OpenAirDocs)
- Reported make and model: AERO COMDR S2R
- Registry model: [Rockwell International S-2R](https://openairdocs.org/model/rockwell-international-s-2r) (registry code 7630202) (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 19790525014069A](https://openairdocs.org/incident/19790525014069A), May 25, 1979: Ayres S2R, Helix, OR, Substantial damage. Engine lost power during spray run. Sprayed oil on windscreen. Found cracked rocker box. Crashed in farm field. .

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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