# NTSB CHI74DEP45: Amer Avco AA1-A, N9394L, Brodhead, WI, April 27, 1974

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: April 27, 1974
- Place: Brodhead, WI · BRODHEAD, WI
- Location: 42.6168° N, 89.3756° W: Placed by OpenAirDocs: center of Brodhead, WI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.6168&lon=-89.3756&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report July 31, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 124762
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI74DEP45
- Page: https://openairdocs.org/ntsb/CHI74DEP45

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1733  74/4/27    BRODHEAD,WIS        AMER AVCO AA1-A     CR-  0  0  2  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 0930                    N9394L              PX-  0  0  0  DUAL                      AGE 22, 560 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            200 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - BRODHEAD
        DEPARTURE POINT             INTENDED DESTINATION
          JANESVILLE,WIS              LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           UNDERSHOOT                                               LANDING: FINAL APPROACH
           COLLIDED WITH: FENCE,FENCEPOSTS                          LANDING: FINAL APPROACH
        PROBABLE CAUSE(S)
           DUAL STUDENT - MISJUDGED DISTANCE AND ALTITUDE
           PILOT IN COMMAND - INADEQUATE SUPERVISION OF FLIGHT
```

## Aircraft

- Registration: [N9394L](https://openairdocs.org/deregistered/N9394L-2004-03-15), registration cancelled 2004-03-15, S/N AA1A-0094, built 1971 (OpenAirDocs)
- Reported make and model: AMER AVCO AA1-A
- Registry model: [American AA-1A](https://openairdocs.org/model/american-aa-1a) (registry code 0630710) (OpenAirDocs)
- Registry engine: [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series) (registry code 41505, 4 cycle) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Brodhead

## Other investigations on N9394L (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 IAD01LA002](https://openairdocs.org/ntsb/IAD01LA002), Oct 11, 2000: American AA-1A (N9394L), Philadelphia, PA, substantial damage. Probable cause: A hole in the #4 piston for undetermined reasons which resulted in engine oil starvation and engine stoppage.

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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