# NTSB UNK65X0867: Pil-Porter PC-6A, N1421Z, Hughes, AK, November 28, 1964

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: November 28, 1964
- Place: Hughes, AK · HUGHES, AK
- Location: 66.0452° N, 154.2376° W: Placed by OpenAirDocs: center of Hughes, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=66.0452&lon=-154.2376&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 5 uninjured
- Status: Completed, report March 29, 1965
- Report: Brief approved by the director
- NTSB case key (mKey): 180616
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=UNK65X0867
- Page: https://openairdocs.org/ntsb/UNK65X0867

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0065  64/11/28 NR.HUGHES ALAS        PIL-PORTER PC-6A    CR-  0  0  1  SCHED DOM PASSG SRV       COMMERCIAL, AGE 36, 5663
        TIME - 1055                    N1421Z              PX-  0  0  4                            TOTAL HOURS, 263 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        OPERATOR - WIEN ALASKA AIRLINES,INC.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GEAR COLLAPSED                                           LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           AIRFRAME - LANDING GEAR: MAIN GEAR-SHOCK ABSORBING ASSY,STRUTS,ATTACHMENTS,ETC.
           MISCELLANEOUS ACTS,CONDITIONS - FROZEN, MOISTURE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
           WEATHER - TURBULENCE IN FLIGHT,CLEAR AIR
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        WEATHER FORECAST - FORECAST SUBSTANTIALLY CORRECT
        EMERGENCY CIRCUMSTANCES - FORCED LANDING ON AIRPORT/SEAPLANE BASE/HELIPT.
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  WIND VELOCITY-KNOTS
          NONE                                                     CALM
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      VFR
        REMARKS- SUDDEN INFLIGHT RELEASE OF STRUT WHICH WAS FROZEN IN COMPRESSED POSITION-WATER GOT IN STRUT TUBE
```

## Aircraft

- Registration: [N1421Z](https://openairdocs.org/deregistered/N1421Z-1991-12-16), registration cancelled 1991-12-16, S/N 561 (OpenAirDocs)
- Reported make and model: PIL-PORTER PC-6A
- Registry model: [Pilatus PC-6/A](https://openairdocs.org/model/pilatus-pc-6-a) (registry code 7090202) (OpenAirDocs)
- Category: Airplane
- Engines: turbo prop
- Damage: Substantial damage

## Other investigations on N1421Z (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 ANC66A0047](https://openairdocs.org/ntsb/ANC66A0047-171457), May 30, 1966: Pilatus PC6AH2 (N1421Z), Rampart, 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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