# NTSB CHI80DEP59: Grum-Amer AA-1B, N89816, Wilmot, WI, September 20, 1980

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: September 20, 1980
- Place: Wilmot, WI · WILMOT, WI
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report December 15, 1980
- Report: Brief approved by the director
- NTSB case key (mKey): 128638
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI80DEP59
- Page: https://openairdocs.org/ntsb/CHI80DEP59

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2907  80/9/20    WILMOT,WI           GRUM-AMER AA-1B     CR-  0  0  1  INSTRUCTIONAL             STUDENT, AGE 40, 79 TOTAL
        TIME - 1230                    N89816              PX-  0  0  0  SOLO                      HOURS, 19 IN TYPE, NOT
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        NAME OF AIRPORT - WESTOSHA
        DEPARTURE POINT             INTENDED DESTINATION
          CHICAGO,IL                  WILMOT,WI
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           HARD LANDING                                             LANDING: LEVEL OFF/TOUCHDOWN
           GROUND-WATER LOOP-SWERVE                                 LANDING: ROLL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER LEVEL OFF
           PILOT IN COMMAND - IMPROPER RECOVERY FROM BOUNCED LANDING
        FACTOR(S)
           AIRPORTS/AIRWAYS/FACILITIES - AIRPORT CONDITIONS: SOFT SHOULDERS
        REMARKS- ACFT PORPOISED
```

## Aircraft

- Registration: N89816 (not matched to a registry record)
- Reported make and model: GRUM-AMER AA-1B
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Westosha

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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