# NTSB MKC72FER31: Cessna 421, N4018L, Crystal, MN, December 7, 1971

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: December 7, 1971
- Place: Crystal, MN · CRYSTAL, MN
- Location: 45.0373° N, 93.3595° W: Placed by OpenAirDocs: center of Crystal, MN, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=45.0373&lon=-93.3595&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report August 16, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 164811
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC72FER31
- Page: https://openairdocs.org/ntsb/MKC72FER31

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4423   71/12/7   CRYSTAL,MINN        CESSNA 421          CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 43, 5020
        TIME - 1232                    N4018L              PX-  0  0  0  CORP/EXEC                 TOTAL HOURS, 200 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        NAME OF AIRPORT - CRYSTAL
        DEPARTURE POINT             INTENDED DESTINATION
          WICHITA,KANS                CRYSTAL,MINN
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            LANDING: FINAL APPROACH
           HARD LANDING                                             LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           POWERPLANT - FUEL SYSTEM: RAM AIR ASSEMBLY
           MISCELLANEOUS - FOREIGN MATERIAL AFFECTING NORMAL OPERATIONS
           MISCELLANEOUS ACTS,CONDITIONS - AIRFRAME ICE
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        REMARKS- ACFT ICE ACCUMN,LOST PWR L ENG,UN CK DSCNT FINAL T/D SHORT OF RWY.BIRD NEST FOUND IN RAM AIR DUCT.
```

## Aircraft

- Registration: N4018L (not matched to a registry record)
- Reported make and model: CESSNA 421
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Crystal

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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