# NTSB LAX73IL041: Cessna 421, N421MC, Las Vegas, NV, February 19, 1973

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: February 19, 1973
- Place: Las Vegas, NV · LAS VEGAS, NV
- Location: 36.1750° N, 115.1372° W: Placed by OpenAirDocs: center of Las Vegas, NV, within about 7 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.1750&lon=-115.1372&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 8 uninjured
- Status: Completed, report April 20, 1973
- Report: Brief approved by the director
- Safety recommendations: Yes
- NTSB case key (mKey): 79591
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX73IL041
- Page: https://openairdocs.org/ntsb/LAX73IL041

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
5-0007  73/2/19    LAS VEGAS,NEV       CESSNA 421          CR-  0  0  2  NONCOMMERCIAL             COMMERCIAL, FL.INSTR.,
        TIME - 1800                    N421MC              PX-  0  0  6  PLEASURE/PERSONAL TRANSP  AGE 27, 1011 TOTAL HOURS,
                                       DAMAGE-MINOR        OT-  0  0  0                            14 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        CLASSIFIED AS INCIDENT
        DEPARTURE POINT             INTENDED DESTINATION
          SALT LAKE CITY,UT           SANTA MONICA,CALIF
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: POOR/INADEQUATE DESIGN
           POWERPLANT - EXHAUST SYSTEM: EXTERNAL SUPERCHARGER
           MISCELLANEOUS ACTS,CONDITIONS - OIL EXHAUSTION-ENGINE LUBRICATION SYSTEM
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  SUSPECTED MECHANICAL DISCREPANCY
        REMARKS- OIL GAGES INDCD LOW.COMPRESSOR SHAFT SEAL,CAUSED BLOW-BY.
```

## Aircraft

- Registration: [N421MC](https://openairdocs.org/aircraft/N421MC), registered now, S/N 421B0321, built 1972 (OpenAirDocs)
- Reported make and model: CESSNA 421
- Registry model: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (registry code 2076014) (OpenAirDocs)
- Registry engine: [Continental GTSIO-520-C](https://openairdocs.org/engine/continental-gtsio-520-c) (registry code 17035, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- 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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