# NTSB ANC75AA069: Hughes 369HS, N9139F, Petersburg, AK, March 23, 1975

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: March 23, 1975
- Place: Petersburg, AK · PETERSBURG, AK
- Location: 56.8113° N, 132.9513° W: Placed by OpenAirDocs: center of Petersburg, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=56.8113&lon=-132.9513&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 3 fatal, 1 serious
- Status: Completed, report March 4, 1976
- Report: Brief approved by the director
- NTSB case key (mKey): 148079
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC75AA069
- Page: https://openairdocs.org/ntsb/ANC75AA069

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3934  75/3/23  NR.PETERSBURG,AK      HUGHES 369HS        CR-  1  0  0  NONCOMMERCIAL             PRIVATE, AGE 50, 3500
        TIME - 1430                    N9139F              PX-  2  1  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 1000 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          JUNEAU,AK                   KETCHIKAN,AK                 COFFMAN COVE,AK
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: CLIMB TO CRUISE
           COLLISION WITH GROUND/WATER: UNCONTROLLED                LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - MISCELLANEOUS: POWERPLANT FAILURE FOR UNDETERMINED REASONS
           PILOT IN COMMAND - FAILED TO MAINTAIN ADEQUATE ROTOR R.P.M.
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPER EMERGENCY PROCEDURES
        FACTOR(S)
           PILOT IN COMMAND - LACK OF FAMILIARITY WITH AIRCRAFT
           WEATHER - SNOW
           MISCELLANEOUS ACTS,CONDITIONS - AIRCRAFT CAME TO REST IN WATER
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        WEATHER BRIEFING - UNKNOWN/NOT REPORTED
        WEATHER FORECAST - UNKNOWN/NOT REPORTED
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON WATER
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          OVERCAST                                                 UNKNOWN/NOT REPORTED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          2 MILES OR LESS                                          SNOW
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TYPE OF WEATHER CONDITIONS
          UNKNOWN/NOT REPORTED                                     VFR
        TYPE OF FLIGHT PLAN
          NONE
        REMARKS- REPTD THAT PLT HADNT MADE AUTOROTATION IN HELI FOR LAST 2 YRS.
```

## Aircraft

- Registration: [N9139F](https://openairdocs.org/deregistered/N9139F-1977-07-14), registration cancelled 1977-07-14, S/N 230449S (OpenAirDocs)
- Reported make and model: HUGHES 369HS
- Registry model: [Hughes 369HS](https://openairdocs.org/model/hughes-369hs) (registry code 4470728) (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 19750323040639A](https://openairdocs.org/incident/19750323040639A), Mar 23, 1975: Hughes 369HS, Petersburg, AK, Destroyed, 2 fatal. Reptd that plt hadnt made autorotation in heli for last 2 yrs.

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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