# NTSB ANC70AA067: Boeing 720B, N3156, Annette Isl, AK, March 28, 1970

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: March 28, 1970
- Place: Annette Isl, AK · ANNETTE ISL, AK
- Location: 55.1350° N, 131.3558° W: Placed by OpenAirDocs: center of Annette Island, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=55.1350&lon=-131.3558&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 27 uninjured
- Status: Completed, report June 8, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 138586
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC70AA067
- Page: https://openairdocs.org/ntsb/ANC70AA067

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0055  70/3/28  NR.ANNETTE ISL,ALAS   BOEING 720B         CR-  0  0  7  SCHED DOM PASSG SRV       CERTIFICATE UNKNOWN, AGE
        TIME - 1810                    N3156               PX-  0  0 20                            UNK/NR, UNK/NR TOTAL
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            HOURS, UNK/NR IN TYPE,
                                                                                                   UNK/NR INSTRUMENT RATED.
        OPERATOR - WESTERN AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          ANCHORAGE,ALAS              SEATTLE,WASH
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           FIRE OR EXPLOSION: IN FLIGHT                             IN FLIGHT: CLIMB TO CRUISE
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: CLIMB TO CRUISE
        PROBABLE CAUSE(S)
           POWERPLANT - MISCELLANEOUS: POWERPLANT FAILURE FOR UNDETERMINED REASONS
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING ON AIRPORT/SEAPLANE BASE/HELIPT.
        REMARKS- DUE TO INSUFFICIENT EVIDENCE CAUSE OF SEPARATION OF FAN HUB FRM NR 1 ENG COULD NOT BE DTRMND.
```

## Aircraft

- Registration: [N3156](https://openairdocs.org/deregistered/N3156-1979-03-29), registration cancelled 1979-03-29, S/N 18829 (OpenAirDocs)
- Reported make and model: BOEING 720B
- Registry model: [Boeing 720-047B](https://openairdocs.org/model/boeing-720-047b) (registry code 1383857) (OpenAirDocs)
- Category: Airplane
- Engines: turbo fan
- Damage: Substantial damage

## Other investigations on N3156 (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 UNK66X0161](https://openairdocs.org/ntsb/UNK66X0161), Aug 4, 1966: Boeing 720B (N3156), Los Mochis, Mexico, no 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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