# NTSB SEA72DTA08: Hughes 369HS, N9059F, Mosby, MT, August 18, 1971

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 18, 1971
- Place: Mosby, MT · MOSBY, MT
- Location: 46.9922° N, 107.8837° W: Placed by OpenAirDocs: center of Mosby, MT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=46.9922&lon=-107.8837&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report April 3, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 162738
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA72DTA08
- Page: https://openairdocs.org/ntsb/SEA72DTA08

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3047  71/8/18  NR.MOSBY,MONT         HUGHES 369HS        CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 22, 1134
        TIME - 1630                    N9059F              PX-  0  0  1  ASSOC FIRE CTL ACTIVITY   TOTAL HOURS, ALL IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         MOSBY,MONT                   LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           MISCELLANEOUS ACTS,CONDITIONS - SIMULATED CONDITIONS
           PILOT IN COMMAND - SELECTED UNSUITABLE TERRAIN
           PILOT IN COMMAND - MISJUDGED SPEED AND ALTITUDE
           TERRAIN - OTHER
        REMARKS- ATMTD FULL PRACTICE AUTO ON SLOPING TRRN.M/R BLDS HIT TAIL.
```

## Aircraft

- Registration: [N9059F](https://openairdocs.org/deregistered/N9059F-2013-11-05), registration cancelled 2013-11-05, S/N 600236S, built 1970 (OpenAirDocs)
- Reported make and model: HUGHES 369HS
- Registry model: [Hughes 369HS](https://openairdocs.org/model/hughes-369hs) (registry code 4470728) (OpenAirDocs)
- Registry engine: [Allison 250 SER 317HP](https://openairdocs.org/engine/allison-250-ser-317hp) (registry code 03011, turbo-shaft) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- Damage: 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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