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| Russian | English |
| крышка смотрового люка | bulkhead inspection hatch cover (Yeldar Azanbayev) |
| смотровая дверца для ручного доступа | Hand Access Door (HVAC discipline, Russian translation to be confirmed, e.g. Access doors are generally sized by considering either "hand access" to valves, wires and pipes or "person access" through a wall or ceiling.  mifab.com Aiduza) |
| смотровое окно | sight glass (Yeldar Azanbayev) |
| смотровое окно | peep-sight glass (Yeldar Azanbayev) |