# NTSB SEA78DYP44: Hiller Acft UH-12E, N99575, Mesa, WA, July 21, 1978

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 21, 1978
- Place: Mesa, WA · MESA, WA
- Location: 46.5735° N, 119.0013° W: Placed by OpenAirDocs: center of Mesa, WA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=46.5735&lon=-119.0013&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report November 7, 1978
- Report: Brief approved by the director
- NTSB case key (mKey): 140222
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA78DYP44
- Page: https://openairdocs.org/ntsb/SEA78DYP44

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2844  78/7/21    MESA,WA             HILLER ACFT UH-12E  CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 53, 12500
        TIME - 1100                    N99575              PX-  0  0  0  AERIAL APPLICATION        TOTAL HOURS, 550 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          MESA,WA                     LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: SWATH RUN
           HARD LANDING                                             LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPERLY SERVICED AIRCRAFT (OWNER-PILOT)
           MISCELLANEOUS - FOREIGN MATERIAL AFFECTING NORMAL OPERATIONS
           MISCELLANEOUS ACTS,CONDITIONS - FUEL STARVATION
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL -  850                       KIND OF OPERATION - SPRAYING CROPS
          KIND OF CROP - POTATOES                                  TYPE OF CHEMICAL USED - LIQUID CHEMICAL-TOXIC
          PILOT' S SEAT BELT -FASTENED-PROPERLY                    GLOVES - NOT USED
          GOGGLES - NOT USED                                       CRASH HELMET - AVAILABLE USED
          TANK/HOPPER-LOCATION - AFT OF PILOT                      TERRAIN-TYPE -LEVEL,FLAT
          ELEVATION-AREA BEING TREATED-FEET -  1220                SWATH RUN-HOW FLOWN - CROSSWIND
        REMARKS- DIRT IN REFUELING TANKS. T/R SEVERED TAIL BOOM.
```

## Aircraft

- Registration: [N99575](https://openairdocs.org/deregistered/N99575-2018-01-17), registration cancelled 2018-01-17, S/N 63-12859 (OpenAirDocs)
- Reported make and model: HILLER ACFT UH-12E
- Registry model: [Hiller OH-23G](https://openairdocs.org/model/hiller-oh-23g) (registry code 4360121) (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 19780721031029A](https://openairdocs.org/incident/19780721031029A), Jul 21, 1978: Hiller OH23G, Mesa, WA, Substantial damage. Dirt in refueling tanks. T/r severed tail boom.

## Other investigations on N99575 (1)

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 SEA81FYM25](https://openairdocs.org/ntsb/SEA81FYM25), May 29, 1981: Hiller Acft UH-12E (N99575), Milton-Freewtr, 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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