# NTSB CHI71AC073: Amer Avco AA-1, N5963L, Mazomanie, WI, April 6, 1971

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: April 6, 1971
- Place: Mazomanie, WI · MAZOMANIE, WI
- Location: 43.1724° N, 89.7953° W: Placed by OpenAirDocs: center of Mazomanie, WI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.1724&lon=-89.7953&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed, report August 19, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 132851
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI71AC073
- Page: https://openairdocs.org/ntsb/CHI71AC073

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0077   71/4/6    MAZOMANIE,WIS       AMER AVCO AA-1      CR-  2  0  0  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 0947                    N5963L              PX-  0  0  0  DUAL                      AGE 27, 700 TOTAL HOURS,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            135 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          WAUNAKEE,WIS                LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           STALL: SPIN                                              IN FLIGHT: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO OBTAIN/MAINTAIN FLYING SPEED
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        REMARKS- LVL FLT,ABT 500FT,ACFT NOSE DWN APRX 45DEG ENTERED R SPIRAL DIVE WITH LOSS OF DIRECTIONAL CTL.
```

## Aircraft

- Registration: [N5963L](https://openairdocs.org/deregistered/N5963L-1971-05-26), registration cancelled 1971-05-26, S/N AA1-0263, built 1969 (OpenAirDocs)
- Reported make and model: AMER AVCO AA-1
- Registry model: [American AA-1](https://openairdocs.org/model/american-aa-1) (registry code 0630610) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

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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