| Subject | English | German |
| el. | primary control | Primaerregelung |
| mech.eng. | primary control | Hauptsteuerorgan |
| el.gen. | primary control of the speed of generating sets | Primärregelung der Drehzahl von Generatorsätzen |
| automat. | primary control element | primäres Regelelement |
| tech. | primary control surface | Hauptsteuerruder |
| tech. | primary control surface | Hauptsteuerflaeche |
| tech. | primary control unit | Vorsteuerung |
| gen. | primary control unit | Leitzentrale |
| tech. | primary controls | Hauptsteuerorgane |