# NTSB ANC76AA011: Hughes 369HS, N717ST, Deadhorse, AK, July 21, 1975

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: July 21, 1975
- Place: Deadhorse, AK · DEADHORSE, AK
- Location: 70.2056° N, 148.5117° W: Placed by OpenAirDocs: center of Deadhorse, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=70.2056&lon=-148.5117&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 4 uninjured
- Status: Completed, report November 21, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 150571
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC76AA011
- Page: https://openairdocs.org/ntsb/ANC76AA011

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3164  75/7/21  NR.DEADHORSE,AK       HUGHES 369HS        CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 30, 2531
        TIME - 2230                    N717ST              PX-  0  0  4  AIR TAXI-PASSG            TOTAL HOURS, 699 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         DEADHORSE,AK                 KAVIK RIVER
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           ROLL OVER                                                LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: OTHER
           MISCELLANEOUS ACTS,CONDITIONS - FUEL CONTAMINATION-EXCLUSIVE OF WATER IN FUEL
           PILOT IN COMMAND - MISJUDGED SPEED AND ALTITUDE
        FACTOR(S)
           POWERPLANT - FUEL SYSTEM: FILTERS,STRAINERS,SCREENS
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- IMPROPER PROC FOR REFUELING FM DRUMS.
```

## Aircraft

- Registration: [N717ST](https://openairdocs.org/deregistered/N717ST-2015-08-04), registration cancelled 2015-08-04, S/N 350717S, built 1971 (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 400HP](https://openairdocs.org/engine/allison-250-ser-400hp) (registry code 03013, turbo-shaft) (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 19750721034789A](https://openairdocs.org/incident/19750721034789A), Jul 21, 1975: Hughes 369HS, Deadhorse, AK, Substantial damage. Improper proc for refueling fm drums.

## Other investigations on N717ST (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 LAX00LA103](https://openairdocs.org/ntsb/LAX00LA103), Feb 14, 2000: Hughes 369HS (N717ST), Pacific Ocean (Pacific Ocean), destroyed. Probable cause: An unknown mechanical malfunction that resulted in a precautionary landing at sea and the subsequent sinking of the helicopter by an ocean swell.

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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