# NTSB SEA77DYP16: Cessna 421A, N421MF, Sandpoint, ID, January 12, 1977

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: January 12, 1977
- Place: Sandpoint, ID · SANDPOINT, ID
- Location: 48.2817° N, 116.5600° W: Placed by OpenAirDocs: center of Sandpoint, ID, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=48.2817&lon=-116.5600&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report February 3, 1977
- Report: Brief approved by the director
- NTSB case key (mKey): 156735
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA77DYP16
- Page: https://openairdocs.org/ntsb/SEA77DYP16

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0067  77/1/12    SANDPOINT,ID        CESSNA 421A         CR-  0  0  1  NONCOMMERCIAL             ATP,FLIGHT INSTR., AGE
        TIME - 0800                    N421MF              PX-  0  0  1  CORP/EXEC                 28, 4378 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            1135 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - CITY-COUNTY ARPT
        DEPARTURE POINT             INTENDED DESTINATION
          SANDPOINT,ID                HELENA,MT
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GROUND-WATER LOOP-SWERVE                                 TAKEOFF: RUN
           COLLIDED WITH: SNOWBANK                                  TAKEOFF: ABORTED
        PROBABLE CAUSE(S)
           AIRFRAME - LANDING GEAR: BRAKING SYSTEM (NORMAL SYSTEM)
           MISCELLANEOUS ACTS,CONDITIONS - BRAKES FROZEN
        FACTOR(S)
           AIRPORTS/AIRWAYS/FACILITIES - AIRPORT CONDITIONS: SNOW ON RUNWAY
           AIRPORTS/AIRWAYS/FACILITIES - AIRPORT CONDITIONS: SNOW WINDROWS
        REMARKS- RT BRAKE LOCKED.ACFT SWERVED RT INTO SNOWBANK.
```

## Aircraft

- Registration: [N421MF](https://openairdocs.org/aircraft/N421MF), registered now, S/N 421C0298 (OpenAirDocs)
- Reported make and model: CESSNA 421A
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (registry code 2076016) (OpenAirDocs)
- Registry engine: [Continental GTSI0-520-F-K](https://openairdocs.org/engine/continental-gtsi0-520-f-k) (registry code 17031, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: City-County Arpt

## 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 19770112000289A](https://openairdocs.org/incident/19770112000289A), Jan 12, 1977: Cessna 421A, Sandpoint, ID, Substantial damage. Rt brake locked. Acft swerved rt into snowbank.

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.