# NTSB OAK7MDJA03: Murrayair MA-1, N306MA, Keaau, HI, December 16, 1976

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: December 16, 1976
- Place: Keaau, HI · KEAAU, HI
- Location: 19.6235° N, 155.0482° W: Placed by OpenAirDocs: center of Keaau, HI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=19.6235&lon=-155.0482&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report March 29, 1977
- Report: Brief approved by the director
- NTSB case key (mKey): 156555
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK7MDJA03
- Page: https://openairdocs.org/ntsb/OAK7MDJA03

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3941  76/12/16   KEAAU,HI            MURRAYAIR MA-1      CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 58,
        TIME - 1437                    N306MA              PX-  0  0  0  ASSOC CROP CTL ACTIVITY   UNK/NR TOTAL HOURS, 19000
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            IN TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          KURTISTOWN,HI.              LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: RETURN TO STRIP
           COLLIDED WITH: CROP                                      LANDING: ROLL
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: BLOWER,IMPELLER ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        FACTOR(S)
           TERRAIN - HIGH VEGETATION
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL - 9999                       KIND OF OPERATION - FERTILIZING (DUST)
          KIND OF CROP - OTHER                                     TYPE OF CHEMICAL USED - DRY CHEMICAL-NONTOXIC
          PILOT' S SEAT BELT -FASTENED-PROPERLY                    GLOVES - NOT USED
          GOGGLES - NOT USED                                       CRASH HELMET - AVAILABLE USED
          CRASH BAR - INSTALLED                                    TANK/HOPPER-LOCATION - FORWARD OF PILOT
        REMARKS- IMPELLER SHAFT BALL BEARING ASSEMBLIES DISINTEGRATED CAUSING EXCESSIVE PLAY OF IMPELLER SHAFT.
```

## Aircraft

- Registration: [N306MA](https://openairdocs.org/deregistered/N306MA-2013-04-15), registration cancelled 2013-04-15, S/N 006, built 1973 (OpenAirDocs)
- Reported make and model: MURRAYAIR MA-1
- Registry model: [Murrayair MA-1](https://openairdocs.org/model/murrayair-ma-1) (registry code 6070102) (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 19761216042409A](https://openairdocs.org/incident/19761216042409A), Dec 16, 1976: Emair MA1, Keaau, HI, Substantial damage. Impeller shaft ball bearing assemblies disintegrated causing excessive play of impeller shaft.

## Other investigations on N306MA (3)

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 LAX87DJA01](https://openairdocs.org/ntsb/LAX87DJA01), Oct 28, 1986: Murrayair MA-1 (N306MA), Hilo, HI, destroyed
- [NTSB OAK79DJA06](https://openairdocs.org/ntsb/OAK79DJA06), Jan 10, 1979: Emair MA-1 (N306MA), Keaau, HI, substantial damage
- [NTSB OAK76DJA07](https://openairdocs.org/ntsb/OAK76DJA07), Dec 8, 1975: Murrayair MA-1 (N306MA), Hilo, HI, 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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