| Segment specification | MTD |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To identify a maintenance operation and its responsible parties. |
| 覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧 |
| 010 |
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7495 | Object type code qualifier | M | 1 | an..3 | |||
| 020 |
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4513 | Maintenance operation code | C | 1 | an..3 | |||
| 030 |
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3005 | Maintenance operation operator code | C | 1 | an..3 | |||
| 040 |
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3009 | Maintenance operation payer code | C | 1 | an..3 |
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