# NTSB CHI75DEV01: Mooney M20, N99WK, Mt Vernon, IL, August 4, 1974

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 4, 1974
- Place: Mt Vernon, IL · MT VERNON, IL
- Location: 38.3142° N, 88.9175° W: Placed by OpenAirDocs: center of Mount Vernon, IL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=38.3142&lon=-88.9175&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report September 13, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 134448
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI75DEV01
- Page: https://openairdocs.org/ntsb/CHI75DEV01

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2469   74/8/4    MT VERNON,ILL       MOONEY M20          CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 21, 150
        TIME - 0130                    N99WK               PX-  0  0  2  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 26 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - MT VERNON OUTLAND
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          SPARTA,ILL                  RETURN                       MT VERNON,ILL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           WHEELS-UP                                                LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO ASSURE THE GEAR WAS DOWN AND LOCKED
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - CHECKLIST-FAILED TO USE
        REMARKS- PLT FAILD TO ENGAGE GR HANDLE IN LOCK POSN.
```

## Aircraft

- Registration: [N99WK](https://openairdocs.org/aircraft/N99WK), registered now, S/N 2396, built 1963 (OpenAirDocs)
- Reported make and model: MOONEY M20
- Registry model: [Mooney M20C](https://openairdocs.org/model/mooney-m20c) (registry code 5870208) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Mt Vernon Outland

## 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 19740804025819A](https://openairdocs.org/incident/19740804025819A), Aug 4, 1974: Mooney M20C, Mt Vernon, IL, Substantial damage. Plt faild to engage gr handle in lock posn.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; 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.