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unit showing four signals: “above slope”, “on slope”, “slightly below” and “below” for the pilot based on the approach angle of the helicopter, mõõteseade, mis näitab nelja signaali: "kalde kohal", "nõlval", "veidi allpool" ja "allpool", mis põhinevad kopteri lähenemisnurgal
helicopter approach path indicator . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/helicopter%20approach%20path%20indicator/1/eng (16.07.2026)