# NTSB CHI74FEP41: Amer Avco AA-1B, N9621L, Waunakee, WI, April 15, 1974

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: April 15, 1974
- Place: Waunakee, WI · WAUNAKEE, WI
- Location: 43.1816° N, 89.4416° W: Placed by OpenAirDocs: center of Waunakee, WI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.1816&lon=-89.4416&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report May 21, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 186289
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI74FEP41
- Page: https://openairdocs.org/ntsb/CHI74FEP41

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0884  74/4/15    WAUNAKEE,WIS        AMER AVCO AA-1B     CR-  0  0  2  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1800                    N9621L              PX-  0  0  0  TRAINING                  AGE 30, 215 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            67 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - WAUNAKEE
        DEPARTURE POINT             INTENDED DESTINATION
          WAUNAKEE,WIS                LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           UNDERSHOOT                                               LANDING: FINAL APPROACH
           COLLIDED WITH: AUTOMOBILE                                LANDING: FINAL APPROACH
        PROBABLE CAUSE(S)
           DUAL STUDENT - MISJUDGED DISTANCE AND ALTITUDE
           PILOT IN COMMAND - INADEQUATE SUPERVISION OF FLIGHT
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OBJECTS OR OBSTRUCTIONS
           PERSONNEL - MISCELLANEOUS-PERSONNEL: DRIVER OF VEHICLE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SUNGLARE
        REMARKS- DARK GREEN AUTO,GRASS BACKGROUND.ACFT T/D ON GRASS AREA BFR RWY.NO ROAD WARNING SIGN.
```

## Aircraft

- Registration: [N9621L](https://openairdocs.org/aircraft/N9621L), registered now, S/N AA1B-0121 (OpenAirDocs)
- Reported make and model: AMER AVCO AA-1B
- Registry model: [Grumman American Avn. AA-1B](https://openairdocs.org/model/grumman-american-avn-aa-1b) (registry code 3960103) (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: Waunakee

## 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 19740415009639A](https://openairdocs.org/incident/19740415009639A), Apr 15, 1974: Grumav AA1B, Waunakee, WI, Substantial damage, 1 fatal. Dark green auto,grass background. Acft t/d on grass area bfr rwy. No road warning sign.

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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