Current standard: IEEE 1278.1
| Value | Description |
|---|---|
| 0 | Not applicable |
| 1 | Primary hatch is closed |
| 2 | Primary hatch is popped |
| 3 | Primary hatch is popped and a person is visible under hatch |
| 4 | Primary hatch is open |
| 5 | Primary hatch is open and person is visible |
| 6 | Unused |
| 7 | Unused |
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