# fsVarsAircraftVarSet<no value>

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Deprecated. Use `fsVarsAVarSet` instead.

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The **fsVarsAircraftVarSet** function can be used to set the value of a specific SimVar.

 

##### Syntax

``` wasm
FsVarError fsVarsAircraftVarSet(
    FsSimVarId simvarId,
    FsUnitId unitId,
    FsVarParamArray param,
    double value
);
```

 

##### Parameters

{{< table-wrapper >}}

| Parameters | Description                                                                                                                                               |
|------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| `simvarId` | The ID of a simvar (found using `fsVarsGetAircraftVarId`).                                                                                                |
| `unitId`   | The ID of an unit (found using [fsVarsGetUnitId](fsvarsgetunitid/)).                                                                                   |
| `param`    | The parameter which might be mandatory to access the simvar (in case of an indexed simvar for instance). Elements in param can be FsCrc, String or index. |
| `value`    | The new value of the simvar.                                                                                                                              |

{{< /table-wrapper >}}


 

##### Return Values

The function returns a `FsVarError`, 0 means there is no error.

 

##### Example

``` wasm
FsUnitId unitId = fsVarsGetUnitId("DEGREES");
FsSimVarId simvarId = fsVarsGetAircraftVarId("ATTITUDE INDICATOR PITCH DEGREES");
FsVarParamArray param = FsCreateParamArray("i", 0);
double newValue = 123;
if (fsVarsAircraftVarSet(simvarId, unitId, param, newValue) == FS_VAR_ERROR_NONE)
{
    // valid
}
else
{
    // error
}
```