# NTSB ANC72AA049: Hiller Acft FH1100, N431FH, Big Delta, AK, June 18, 1972

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 18, 1972
- Place: Big Delta, AK · BIG DELTA, AK
- Location: 64.1525° N, 145.8422° W: Placed by OpenAirDocs: center of Big Delta, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=64.1525&lon=-145.8422&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report March 21, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 167176
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC72AA049
- Page: https://openairdocs.org/ntsb/ANC72AA049

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3297  72/6/18    BIG DELTA,ALAS      HILLER ACFT FH1100  CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 28, 3215
        TIME - 1700                    N431FH              PX-  0  0  1  ASSOC FIRE CTL ACTIVITY   TOTAL HOURS, 219 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          BIG DELTA,ALAS              LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLIDED WITH: OBJECT                                    IN FLIGHT: HOVERING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OBJECTS OR OBSTRUCTIONS
        FACTOR(S)
           PILOT IN COMMAND - DIVERTED ATTENTION FROM OPERATION OF AIRCRAFT
           TERRAIN - OTHER
           MISCELLANEOUS ACTS,CONDITIONS - AIRCRAFT CAME TO REST IN WATER
        REMARKS- M/R BLADES HIT STUMP WHILE CREW WAS TRYING TO RETRIEVE DUFFEL BAG FROM RIVER.
```

## Aircraft

- Registration: [N431FH](https://openairdocs.org/deregistered/N431FH-1974-02-14), registration cancelled 1974-02-14, S/N 137, built 1969 (OpenAirDocs)
- Reported make and model: HILLER ACFT FH1100
- Registry model: [Fairchild Hiller FH-1100](https://openairdocs.org/model/fairchild-hiller-fh-1100) (registry code 3376502) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- Damage: Destroyed

## Other investigations on N431FH (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 ANC70A0045](https://openairdocs.org/ntsb/ANC70A0045), Nov 30, 1969: Hiller Acft FH1100 (N431FH), Arctic Vil, AK, 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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