# NTSB ANC71IA015: Grumman G-21A, N4773C, Juneau, AK, August 30, 1970

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: August 30, 1970
- Place: Juneau, AK · JUNEAU, AK
- Location: 58.3019° N, 134.4197° W: Placed by OpenAirDocs: center of Juneau, AK, within about 29 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=58.3019&lon=-134.4197&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 6 uninjured
- Status: Completed, report February 11, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 158797
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC71IA015
- Page: https://openairdocs.org/ntsb/ANC71IA015

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0052  70/8/30  NR.JUNEAU,ALAS        GRUMMAN G-21A       CR-  0  0  1  SCHED DOM PASSG SRV       CERTIFICATE UNKNOWN, AGE
        TIME - 1530                    N4773C              PX-  0  0  5                            41, 13500 TOTAL HOURS,
                                       DAMAGE-MINOR        OT-  0  0  0                            800 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        CLASSIFIED AS INCIDENT
        OPERATOR - ALASKA AIRLINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          KETCHIKAN,ALAS              JUNEAU,ALAS
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: PROPELLER                       IN FLIGHT: NORMAL CRUISE
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           POWERPLANT - PROPELLER AND ACCESSORIES: BLADES
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
           MISCELLANEOUS ACTS,CONDITIONS - CORRODED/CORROSION
           MISCELLANEOUS ACTS,CONDITIONS - VIBRATION,EXCESSIVE
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON WATER
                                  UNUSUAL NOISE
                                  PROP/ENGINE VIBRATION
        REMARKS- 3 FT OF LT PROP BLADE SEPARATED. CAUSED FURTHER DMG TO L ENG. MACHINE TOOL MARKS,CORROSION FOUND.
```

## Aircraft

- Registration: N4773C (not matched to a registry record)
- Reported make and model: GRUMMAN G-21A
- Category: Airplane
- Engines: turbo prop
- Damage: Minor 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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