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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.
The names Electronic Attitude Director Indicator and Electronic Horizontal Situation Indicator are used by some manufacturers. [1] However, a simulated ADI is only the centerpiece of the PFD. Additional information is both superimposed on and arranged around this graphic. Multi-function displays can render a separate navigation display unnecessary.
The attitude indicator (AI), also known as the gyro horizon or artificial horizon, is a flight instrument that informs the pilot of the aircraft orientation relative to Earth's horizon, and gives an immediate indication of the smallest orientation change. The miniature aircraft and horizon bar mimic the relationship of the aircraft relative to ...
These include the Horizontal Situation Indicator (HSI) and Attitude Director Indicator (ADI). The HSI combines the magnetic compass with navigation signals and a Glide slope. The navigation information comes from a VOR/Localizer, or GNSS. The ADI is an Attitude Indicator with computer-driven steering bars, a task reliever during instrument flight.
Electronic Horizontal Situation Indicator EICAS engine-indicating and crew-alerting system: EIS Electronic Instrument System: E-LSA experimental light-sport aircraft: ELAC elevator and aileron computer ELOS Equivalent Level of Safety ELT emergency locator transmitter: EMAS engineered materials arresting system: EMDP electric motor driven pump ENC
The ADC supplies altitude, airspeed and temperature data, heading data from magnetic sources such as flux valves, heading selected on the Horizontal Situation Indicator (HSI) (or Primary flight display (PFD)/multi-function display (MFD)/ electronic horizontal situation indicator (EHSI)), navigation data from Flight Management System (FMS), VHF ...
The Heading Indicator can be combined with information from navigation radios (primarily VOR/ILS) in a similar way, to create the Horizontal Situation Indicator. The HSI, along with the VOR system, has largely replaced use of the RMI, however the HSI's much higher cost keeps the older combination of an RMI and an Omni Bearing Indicator ...
Most cockpit instruments were still analog, but cathode-ray tube (CRT) displays were to be used for the attitude indicator and horizontal situation indicator (HSI). However, the 2707 was cancelled in 1971 after insurmountable technical difficulties and ultimately the end of project funding by the US government.