What is an OBS in aviation?

Asked By: Dayra Mojaiskov | Last Updated: 24th January, 2020
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If the location of the aircraft is to the left of course, the needle deflects to the right, and vice versa. The OBS (Omni Bearing Selector) knob is on the CDI, it is not its own instrument. The knob allows the selection (via the outer ring) of the radial (course) you wish to track from a VOR ground station.

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Just so, what is an HSI in aviation?

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.

Beside above, what does the CDI button do? The CDI key (C) is used to toggle which navigation source (GPS or VLOC) provides output to an external HSI or CDI. The OBS key (O) is used to select manual or automatic sequencing of waypoints.

Considering this, what is an Omni Bearing Selector?

OMNI BEARING SELECTORS (OBS) The Omni Bearing Selector (OBS) is an integral part of the VOR navigation system. With its attendant VOR converter it allows a pilot to select and determine the radial that he is on and provides an accurate error signal that is proportional to the offset from the intended track.

How does a HSI work?

The horizontal situation indicator (HSI) was designed to eliminate some of the work of using very-high-frequency omnidirectional range (VOR) navigation and instrument landing systems (ILS). The HSI works by combining a VOR/DME receiver and an electrically-slaved heading indicator.

35 Related Question Answers Found

What does slaved HSI mean?

The Horizontal Situation Indicator (HSI) instrument display combines continuously slaved aircraft heading information and VOR/LOC/GPS/GS displays in one unit.

What does ECAM stand for?

electronic centralised aircraft monitoring

What does ADI stand for in aviation?

Attitude Direction Indicator

What does the MFD display?

A multifunction display (MFD) is a small-screen (CRT or LCD) surrounded by multiple soft keys (configurable buttons) that can be used to display information to the user in numerous configurable ways.

What is a ADF in aviation?

Automatic direction finding (ADF) is an electronic aid to navigation that identifies the relative bearing of an aircraft from a radio beacon transmitting in the MF or LF bandwidth, such as an Non-Directional Beacon or commercial radio broadcast station.

What is VOR in aviation?

Very High Frequency (VHF) Omni-Directional Range (VOR) is a type of short-range radio navigation system for aircraft, enabling aircraft with a receiving unit to determine its position and stay on course by receiving radio signals transmitted by a network of fixed ground radio beacons.

What are the different types of VOR?

There are three types of VOR navigational stations: VOR (just the VOR), VOR-DME (VOR plus distance measuring equipment), and vortac (VOR plus the military's tactical air navigation system). Each VOR station can further be classified according to its range - terminal, low altitude, or high altitude.

Do pilots still use VOR?

Pilots fly certain radials to or from VORs as a primary way of navigating. Airways often are designed to and from VOR facilities for ease of use. As of 2018, pilots still use VORs as a primary navigational aid, but as more and more aircraft are equipped with GPS receivers, VORs most likely will be retired from use.

Are VOR radials true or magnetic?

VOR stations in areas of magnetic compass unreliability are oriented with respect to True North. However, it doesn't really matter anyway because your own compass would be unreliable as well when flying in the vicinity of such a VOR. After all, when navigating using a VOR, you don't fly a heading, you fly a radial.

How do you find the distance between VOR radials?

The distance from the station is computed by multiplying TAS or GS (in miles per minute) by the previously determined time in minutes. For example, if the aircraft is 7.5 minutes from station, flying at a TAS of 120 knots or 2 NM per minute, the distance from station is 15 NM (7.5 × 2 = 15).

How do you fly a radial?

Flying an intercept
  1. Start on a known radial—Make sure the course deviation indicator is centered and showing either to or from the station correctly.
  2. Select the desired radial— Turn the omni-bearing selector (OBS) to the desired radial of intercept.
  3. Decide on the intercept—Now comes the hard part.

What is reverse sensing VOR?

Reverse sensing occurs when the current heading is on the bottom half of the VOR. Used wth permission from allaboutairplanes.wordpress.com. Taking this theory to the HSI where the currently flown heading is always on the top half and you can never have reverse sensing.

What is the difference between bearing and course?

Heading is the direction the airplane is pointed, whereas track is the actual direction of the airplane tracking across the ground. Bearing is the angle between any two points, whereas course is your intended path of travel to your destination.

What is OBS mode g1000?

When OBS mode is active, the G1000 allows the pilot to set a desired course to/from a waypoint using the CRS/BARO Knob and HSI (much like a VOR). The most common application for using the OBS Softkey is the missed approach.

How do you use a course deviation indicator?

A course deviation indicator (CDI) is an avionics instrument used in aircraft navigation to determine an aircraft's lateral position in relation to a course to or from a radio navigation beacon. If the location of the aircraft is to the left of this course, the needle deflects to the right, and vice versa.

How many VOR stations are in the US?

The FAA currently owns and operates 957 VORs in the continental United States. An additional 100 nonfederal VORs are in operation around the country, but are not part of the effort to create a minimum operational network. The minimum operational network program will leave two-thirds of the federal network in place.

What is the full scale deflection of a CDI when tuned to a localizer?

As every runway is of different length, and the localizer antennae is at the far end of the runway, the LLZ beams are now of different angular spread for each runway. jr, Please disregard the above post. On the standard CDI, full scale deflection is indeed 2.5 degrees in ILS mode.