# NTSB MIA81FA101: Cessna P206A, N4621F, Marathon, FL, July 28, 1981

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 28, 1981
- Place: Marathon, FL · MARATHON, FL
- Location: 24.7323° N, 81.0251° W: Placed by OpenAirDocs: center of Marathon, FL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=24.7323&lon=-81.0251&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report November 9, 1981
- Report: Brief approved by the director
- NTSB case key (mKey): 124511
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA81FA101
- Page: https://openairdocs.org/ntsb/MIA81FA101

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2183  81/7/28    MARATHON,FL         CESSNA P206A        CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 58, 10000
        TIME - 1600                    N4621F              PX-  0  0  2  OTHER                     TOTAL HOURS, 300 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        NAME OF AIRPORT - MARATHON
        DEPARTURE POINT             INTENDED DESTINATION
          MARATHON,FL                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: PROPELLER                       TAKEOFF: RUN
        PROBABLE CAUSE(S)
           POWERPLANT - PROPELLER AND ACCESSORIES: HUBS
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
        FACTOR(S)
           POWERPLANT - ENGINE STRUCTURE: CRANKSHAFT
           MISCELLANEOUS ACTS,CONDITIONS - EXCESSIVE-WEAR/PLAY
        REMARKS- CHARTER SIGHTSEEING FLT.MCCAULEY HUB MODEL E2A34C74,SEPARATED.DYN DAMPENER,P/N 352117,BYND LIMITS.
```

## Aircraft

- Registration: [N4621F](https://openairdocs.org/deregistered/N4621F-2021-04-03), registration cancelled 2021-04-03, S/N P206-0221 (OpenAirDocs)
- Reported make and model: CESSNA P206A
- Registry model: [Cessna P206A](https://openairdocs.org/model/cessna-p206a) (registry code 2073308) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Marathon

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19810728050609A](https://openairdocs.org/incident/19810728050609A), Jul 28, 1981: Cessna P206A, Marathon, FL, Substantial damage. Lost prop blade on takeoff. Aborted.blade broke at prop hubdue to fatigue crack. Crankshaft counterweight imbalance.

## Other investigations on N4621F (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 MIA71DLD05](https://openairdocs.org/ntsb/MIA71DLD05), Jul 29, 1970: Cessna P206A (N4621F), Ocala, FL, 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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.