# NTSB SEA81DYA27: Aerospatle SA316B, N84850, Driggs, ID, August 30, 1981

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 30, 1981
- Place: Driggs, ID · DRIGGS, ID
- Location: 43.7298° N, 111.1050° W: Placed by OpenAirDocs: center of Driggs, ID, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.7298&lon=-111.1050&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report October 9, 1981
- Report: Brief approved by the director
- NTSB case key (mKey): 124045
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA81DYA27
- Page: https://openairdocs.org/ntsb/SEA81DYA27

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2664  81/8/30  NR.DRIGGS,ID          AEROSPATLE SA316B   CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 36, 4560
        TIME - 1410                    N84850              PX-  0  0  0  AIR TAXI-CARGO            TOTAL HOURS, 920 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          DRIGGS,ID                  DRIGGS,ID
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      IN FLIGHT: HOVERING
           COLLISION WITH GROUND/WATER: UNCONTROLLED                LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPER MAINTENANCE (MAINTENANCE PERSONNEL)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: TAIL ROTOR DRIVE SHAFT ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - LACK OF LUBRICATION-SPECIFIC PART,NOT SYSTEM
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- TEETH OF SPLINED COUPLING GEAR,PN 3130-567-12-005,WORN EXCESSIVELY.
```

## Aircraft

- Registration: [N84850](https://openairdocs.org/deregistered/N84850-1988-11-17), registration cancelled 1988-11-17, S/N 2229 (OpenAirDocs)
- Reported make and model: AEROSPATLE SA316B
- Registry model: [Aerospatiale SA315B](https://openairdocs.org/model/aerospatiale-sa315b) (registry code 8680615) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- 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 19810830053519A](https://openairdocs.org/incident/19810830053519A), Aug 30, 1981: Aerosp SA316B, Driggs, ID, Substantial damage. Helicopter crashed after loss of antitorque control. Investigation revealed failed coupling in tail boom.

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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