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The horizontal situation indicator (commonly called the HSI) is an aircraft flight instrument normally mounted below the artificial horizon in place of a conventional heading indicator. It combines a heading indicator with a VHF omnidirectional range-instrument landing system (VOR-ILS) display.[1] This reduces pilot workload by lessening the number of elements in the pilot's instrument scan to the six basic flight instruments. Among other advantages, the HSI offers freedom from the confusion of reverse sensing on an instrument landing system localizer back course approach. As long as the needle is set to the localizer front course, the instrument will indicate whether to fly left or right, in either direction of travel.
On the HSI, the aircraft is represented by a schematic figure in the centre of the instrument – the VOR-ILS display is shown in relation to this figure. The heading indicator is usually slaved to a remote compass and the HSI is frequently interconnected with an autopilot capable of following the heading select bug and of executing an ILS approach by following the localizer and glide slope.[1]
On a conventional VOR indicator, left–right and to–from must be interpreted in the context of the selected course. When an HSI is tuned to a VOR station, left and right always mean left and right and TO/FROM is indicated by a simple triangular arrowhead pointing to the VOR. If the arrowhead points to the same side as the course selector arrow, it means TO, and if it points behind to the side opposite the course selector, it means FROM. The HSI illustrated here is a type designed for smaller airplanes and is the size of a standard 3 ¼-inch instrument. Airline and jet aircraft HSIs are larger and may include more display elements.
The most modern HSI displays are electronic and often integrated with electronic flight instrument systems into so-called "glass cockpit" systems.
See also
- Acronyms and abbreviations in avionics
- Flight instruments
Notes
- Instrument Flying Handbook 2012 (FAA-H-8083-15B). United States Department of Transportation, Federal Aviation Administration, Airman Testing Standards Branch. 2012. pp. 5–23, 7–38.
На других языках
- [en] Horizontal situation indicator
[it] Indicatore della situazione orizzontale
L'indicatore della situazione orizzontale, o Horizontal Situation Indicator (HSI) è un indicatore della rotta adottato in quasi tutti gli aeromobili, sia civili che militari. Questo indicatore sfrutta i segnali radio VHF/FM e la bussola magnetica, nonché le informazioni provenienti dalle stazioni VOR, LOC, GS ed MB, per informare il pilota della direzione di rotta, dell'orientamento, della distanza dal punto d'arrivo e di vari altri dati.[ru] Плановый навигационный прибор
Плановый навигационный прибор (ПНП, англ. Horizontal Situation Indicator) — комбинированный пилотажно-навигационный прибор, показывающий основную навигационную информацию: текущий курс, отклонение от заданного курса, пеленг на радионавигационную станцию или иной радиомаяк и расстояние до этой станции, а также другие (в зависимости от исполнения) параметры, касающиеся положения летательного аппарата относительно земной поверхности в горизонтальной плоскости.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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