# NTSB CHI78FEC45: Grum Amer AA1-B, N1SU, Milford, MI, August 4, 1978

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: August 4, 1978
- Place: Milford, MI · MILFORD, MI
- Location: 42.5885° N, 83.6016° W: Placed by OpenAirDocs: center of Milford, MI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.5885&lon=-83.6016&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed, report October 4, 1978
- Report: Brief approved by the director
- NTSB case key (mKey): 140027
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI78FEC45
- Page: https://openairdocs.org/ntsb/CHI78FEC45

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2297   78/8/4  NR.MILFORD,MI         GRUM AMER AA1-B     CR-  0  1  0  NONCOMMERCIAL             PRIVATE, AGE 50, 426
        TIME - 1105                    N1SU                PX-  0  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 8 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          NEW HUDSON,MI               LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           STALL: SPIN                                              IN FLIGHT: ACROBATICS
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO OBTAIN/MAINTAIN FLYING SPEED
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        FACTOR(S)
           PILOT IN COMMAND - ATTEMPTED OPERATION BEYOND EXPERIENCE/ABILITY LEVEL
        REMARKS- ENTERED FLAT SPIN FROM A SPLIT-S MANEUVER.
```

## Aircraft

- Registration: [N1SU](https://openairdocs.org/deregistered/N1SU-1979-05-31), registration cancelled 1979-05-31, S/N AA1B-0004, built 1972 (OpenAirDocs)
- Reported make and model: GRUM AMER AA1-B
- Registry model: [American AA-1B](https://openairdocs.org/model/american-aa-1b) (registry code 0630820) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

## 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 19780804025669A](https://openairdocs.org/incident/19780804025669A), Aug 4, 1978: Grumav AA1B, Milford, MI, Destroyed. Entered flat spin from a split-s maneuver.

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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