A Maintenance Hatch can be located at some points on a vessel, and are small unobtrusive hatches that have been placed in bulkheads to allow repair or service personnel access to machinery or equipment.
- It is considered a kind of Ship Equipment.
Maintenance Hatches: Maintenance hatches are kept closed except when actually in use; they are generally ignored by crew members and unnoticed by passengers. Maintenance hatches are not powered. They most often lock with a service key. On most commercial vessels, all maintenance hatch locks are opened by the same key; most officers and senior crew personnel are issued this key. On military ships, these hatches are more often separately keyed, with keys to any given hatch issued only to properly authorized personnel. 
|Deck Plan Symbols|
|Late Key Diagram||Early Key Diagram|
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