# NTSB ANC71FAG84: Pilatus PC-6, N4911, Iliamna, AK, May 4, 1971

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: May 4, 1971
- Place: Iliamna, AK · ILIAMNA, AK
- Location: 59.7568° N, 154.9111° W: Placed by OpenAirDocs: center of Iliamna, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=59.7568&lon=-154.9111&mi=10
- Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report January 6, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 161265
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC71FAG84
- Page: https://openairdocs.org/ntsb/ANC71FAG84

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1481   71/5/4    ILIAMNA,ALAS        PILATUS PC-6        CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, AGE 45, 16200
        TIME - 1145                    N4911               PX-  0  0  2  BUSINESS                  TOTAL HOURS, 350 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - ROADHOUSE
        DEPARTURE POINT             INTENDED DESTINATION
          ANCHORAGE,ALAS              ILIAMNA,ALAS
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           FIRE OR EXPLOSION: ON GROUND                             STATIC: IDLING ENGINE(S)
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
           POWERPLANT - FUEL SYSTEM: LINES AND FITTINGS
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY SECURED
        REMARKS- FLXBL HOSE ATCHD TO BOOST PUMP DISCHRG TUBE BY CLAMP,NORM EMPLOYS FITTINGS.SHARP EDGES,FLARED END.
```

## Aircraft

- Registration: [N4911](https://openairdocs.org/deregistered/N4911-1999-09-14), registration cancelled 1999-09-14, S/N 543, built 1964 (OpenAirDocs)
- Reported make and model: PILATUS PC-6
- Registry model: [Pilatus PC-6/350](https://openairdocs.org/model/pilatus-pc-6-350) (registry code 7090114) (OpenAirDocs)
- Registry engine: [Lycoming IGO-540-B1A](https://openairdocs.org/engine/lycoming-igo-540-b1a) (registry code 41538, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Roadhouse

## Other investigations on N4911 (2)

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 ANC97LA158](https://openairdocs.org/ntsb/ANC97LA158), Sep 30, 1997: Pilatus PC-6-350 (N4911), Palmer, AK, substantial damage. Probable cause: An underspeed of the propeller system.
- [NTSB ANC69A0057](https://openairdocs.org/ntsb/ANC69A0057), May 20, 1969: Pilatus PC-6 (N4911), Dead Horse, 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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