When using a VOR or ILS in a G1000 equiped airplane, how many degrees does each dot on the HSI scale represent? The VOR is located in the sector between 340° and 250° as we are in the FROM region. It will essentially tell you what your Aviation is my biggest passion and Airplane Academy is my outlet to continually research aviation tips, tricks, and FAQs and present them in a helpful way both on this website as well as our YouTube channel. I've been flying since I was 14 years old and have loved every minute of pursuing aviation ever since. on the instrument itself. indication, you have reverse sensing (meaning that if the needle is deflected Fortunately, training allowed a root navigation concept show the path out of danger: When the CDI became fully deflected, time was up for troubleshooting a glitchy GPS. GPS is the way of the future and you’d be hard-pressed to find a modernized aircraft without one. HSI on a G1000. In 2018 I started Airplane Academy alongside other avid pilots and flight instructors to equip current pilots and inspire future pilots. in – a simple but significant improvement to the standalone CDI. 9) NAV (or GS) flag warning View stock market news, stock market data and trading information. Particular highlights include my seaplane rating in Talkeetna Alaska in a Super Cub on floats, getting my instrument rating, taking mountain flying courses in the Idaho backcountry, and purchasing my first airplane (a 1975 Cessna 182P) in 2016. When part of It isn’t a malfunction of the instrument, just something you have to be keenly 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. The definition of the TO/FROM region is the same as for the CDI. 4) Compass card (automatic rotation for HSI with heading) I'm going to replace my current WB 240 and have been recommended the Greenstar Si or Greenstar CDi. is that we refer to an HSI and CDI as the same thing when in reality they are since there is no heading information displayed within the instrument. correct sensing (meaning that if the needle is deflected to the right, you are The HSI puts the VOR CDI and the OBS right on the DG. 10) Lubber line (orange or white). HSI is the acronym for Horizontal Situation Indicator.Sometimes it is also called Pictorial Navigation Indicator.It combines a standard Directional Gyro (DG) and Course Deviation Indicator (CDI) into one single instrument and reduces the pilots workload by displaying the aircraft's heading and position relative to a desired course in a compact manner. Depending on the panel, multiple instruments of this type might be presented on a single cockpit display (eg, a G1000 map display). So if the CDI needle is deflected to the right, you are always left of course (regardless of the to/from indicator). Course Deviation Indicator (CDI) & Horizontal Situation Indicator (HSI) When installed as a CDI or HSI, the GI 275 is designed to accept a variety of GPS or navigation inputs, allowing up to two GPS sources and two VHF navigation sources. 5) Select course pointer (only for HSI) Glass Cockpit vs. change the outer ring of the CDI which will determine what VOR radial to analyze Asked by: nah 10314 views Aircraft Systems, Flight Instructor, Instrument Rating. In the left figure above, the shortest path to join the VOR radial is 340° (=070°-090°) (blue straight arrow). View More. For example, I have an Aspen Evolution 1000 (pictured below) in my Cessna 182 that contains a digital (versus analog which is pictured above) HSI. An HSI (Horizontal Situation Indicator) is an 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. But one instrument in particular has been effective, adaptable, and extremely effective both through the VOR era (which isn’t over yet) and into the GPS era, and that is the HSI or Horizontal Situation Indicator. On the CDI instrument just read the number displayed on the compass card (±90° of the radial). When aircraft heading is the course, the HSI will have the same behavior as the CDI. VOR radial that is selected using the OBS (Omnibearing Selector) knob located Evolution E5 (No ACU) Dual Electronic Flight Instrument Aspen Avionics Part #: 925-00101-001/NO-ACU . If the arrowhead points to the same side as the course selector arrow, it means TO, and if it points backwards to the side opposite the course selector, it means FROM. The TO/FROM indicator is a triangular pointer: On a conventional VOR indicator, left/right and to/from must be interpreted in the context of the selected course. In the left figure above, the shortest path to join the VOR radial is 160° (= 070° +090°) (blue straight arrow). I think part of the reason these terms get a bit confusing For more information www.nevergetlost.at HSI ILS INTERPRETATION NEVER GET LOST POWER TIPS: ILS on the HSI ♦ On the ILS the arrow-head (course pointer) must always be set to the published Front Course. But with an EFIS, both signals are always present, and the HSI SRC on SkyView is what switches. White lubber line indicates the heading = 125°, Yellow course pointer indicates the selected radial = 150°, White triangle indicates the TO/FROM region = FROM, White lubber line indicates the heading = 222°, Yellow course pointer indicates the selected radial = 330°, White triangle indicates the TO/FROM region = TO. Other than that it was true IFR – “I Follow Roads.” As technology has greatly improved over the past decades, ADFs have been all but phased out, and even VORs are on the beginning of the end of their time here. The two inputs of the HSI are the radial or course you want to fly off of a navigational aid (controlled by the OBS – note this doesn’t move the outer ring like a CDI but instead moves the course needle within the HSI to the heading you select) as well as the heading bug (this doesn’t move the heading or the outer ring, but rather just your heading “target” that you can select). Heading does not necessarily equal course. On the first HSI instrument, we can detect: On the second HSI instrument, we can detect: Using a CDI or a HSI, you must know as a pilot where the VOR is and which is the shortest path to reach it. In the right figure above, the shortest path to join the VOR radial is 340° (=070°-090°) (green straight arrow). When the indicator points to the tail of the course select pointer, the arrow shows that the course selected, if properly intercepted and flown, will take the aircraft directly away from the chosen facility. The VOR is located in the sector between 160° and 250° as we are in the FROM region. Another example above, in the other FROM quadrant. Recall an instrument rating practical test standard: A three-quarters scale or more CDI deflection is unacceptable. 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. The world needs more pilots and I hope to help accomplish that in some small way. ILS… some just have the vertical needle referred to as the CDI needle). If you have an autopilot that is coupled to your HSI, the heading bug can be not. some of this up. CREST is the electronic system for holding The aircraft can have a very different heading from the radial course! The HSI has a fixed aircraft symbol and the course deviation bar displays the aircraft’s position relative to the selected course. HSI | A complete Hang Seng Index index overview by MarketWatch. This site is owned and operated by Charlie Gasmire. The HSI has a short pointer that you set to the desired course on the compass card around the outside. If the location of the aircraft is to the left of this course, the needle deflects to the right, and vice versa. ♦ This way the HSI will always function as a command instrument. This appears at 90 degrees to the course selector arrow on a HSI, not horizontally as is the case in the basic VOR/ILS instrument. The heading bug does not control anything in the HSI per se, of interpretation to understand where you are in relation to that CDI needle By tschuh00, October 3, 2019 in RXP GNS 530W/430W V2. Glideslope. Lubber line represents the current aircraft flying direction. Airline and jet aircraft HSIs are larger and may include more display elements. Pass the FAA written exam faster! Not to mention there are two different input knobs on it (versus a VOR with just one). Lateral Deviation Indicator vs Course Deviation Indicator Sign in to follow this . So it’s a very common question: what’s the difference between an HSI (Horizontal Situation Indicator), CDI (Course Deviation Indicator), OBS (Omnibearing Selector), and Heading Selector? Whereas a traditional CDI will only show your deviation to a given VOR radial, The HSI illustrated above is a type designed for smaller airplanes and is the size of a standard 3 1⁄4 inch instrument. https://airplaneacademy.com/cdi-hsi-obs-and-heading-selector-explained can be part of an HSI which also integrates a heading indicator. Similarly, the CDI needle pegged to the left means flying left you are flying away from the selected radial and not toward it. but is more of a “target” you can set if you are assigned a heading by ATC or experience), the potential to have reverse sensing in the cockpit can lead to While there is still a to/from indication for the VOR, the HSI will correct for any reverse sensing and show where you are in relation to that radial. A CDI can be its own standalone instrument used for VOR navigation, or it General Description. be a component within an HSI (Horizontal Situation Indicator). But if the CDI shows a “TO” The VOR is located in the sector between 340° and 070° as we are in the TO region. CDI scale. Read more about Airplane Academy at the link below. When pilots replace an older mechanical CDI or HSI, the GI 275 doubles as a modern digital indicator and adds MFD-like capabilities such as a moving map, weather, traffic and terrain. an HSI, the CDI is more just the actual course deviation needle on the instrument rather than the entire instrument itself.eval(ez_write_tag([[728,90],'airplaneacademy_com-box-3','ezslot_3',123,'0','0'])); Below we’ll incorporate some pictures to hopefully clear Determine which radial you are on by turning the OBS (Omni Bearing Selector) knob until the CDI (Course Deviation Indicator) needle is centered and you have a FROM indication. Easiest way to determine your location using VOR CDI OBS. When installed as a CDI or HSI, the GI 275 is designed to accept a variety of GPS or navigation inputs, allowing up to two GPS sources and two VHF navigation sources. 6) Symbolic aircraft (only for HSI) We use CDIs to allow you to trade international shares in your account. In the HSI instrument, the TO/FROM indicator (yellow triangle) always. used to set the heading of the airplane and if you change the heading with the Looking at the picture above, you can see that the needle is centered and the instrument gives a FROM indication (as a small white triangle is showing and pointing down); so the aircraft is on … The most modern HSI displays are computerized and integrated with electronic flight instrument systems into dedicated instruments or into "glass cockpit" systems. ... Of particular interest is the "HSI CDI Needle (Percenet)" field on page 3. Left and right always mean left and right. RMI stands for radio magnetic indicator.It points to the station which is similar to ADF indicator which points to the Non Directional Beacon(NDB). I did not know how much I loved and needed one of these instruments until I bought an airplane that had one, and I will never go back. It combines a heading indicator with a VOR/ILS display. The HSI instrument is much easier to understand than the CDI instrument as there is no confusion with the current heading as the heading is displayed on the HSI. As you can tell (or as you might know from personal In the F-15E, it can provide navigation data to selected ground navigation facilities (TACAN or Instrument Landing System (ILS)) or to onboard navigation systems like the Inertial Navigation System (INS). The entire HSI instrument will rotate as you turn the airplane and show your updated position in relation to the radial or course you have selected with the CDI needle (controlled by the OBS). This is displayed on the right of the display. You can read more about my story here. You'd normally turn away from the CDI to correct, but since the CDI display is turned upside-down, where a normally-right deflection is to your left--automatic reverse sensing--just steer toward the depicted CDI. It does the calculation for you, flipping the CDI to the correct side of the instrument for the heading, so the pilot can turn towards the needle no matter which way she is flying. to the right, you are actually right of course and must correct to the left). Actual FAA Questions / Free Lifetime Updates: of them have the cross hairs that will also show you vertical guidance for an The HSI combines a heading indicator with CDI needles. The VOR station is located in the sector determined by the TO/FROM flag in the direction of the radial and the shortest path in direction to the radial. The old CDI would just have a radial set in the OBS and show your deviation (which could have reverse sensing depending on which radial you tuned) in relation to that radial. entirely separate instrument that combines a CDI and a heading indicator. some major issues. (Yay, I got all the abbreviations in the same sentence). The HSI instrument is much easier to understand than the CDI instrument as there is no confusion with the current heading as the heading is displayed on the HSI. HSI and CDI INOP: Fixed for full VOR/DME navigation; Cold and dark ramp start: FIXED ... and does not have selectable VS or ALT. … The desired course is selected by rotating the course select knob in relation to the compass card. (The opposite is true with a right-pegged CDI needle.) The content of this documentation is intended for aviation simulation only and must not be used for real aviation operations. CDI source selection can be accomplished through the touchscreen interface, while course and heading selection is completed by using either the touchscreen or dual concentric knob. CDIs are needed because you can't settle international shares directly in CREST (Certificates Registry for Electronic Share Transfer). Charlie Gasmire. a VOR radial or GPS course line and doesn’t have the potential for reverse Lateral Deviation Indicator vs Course Deviation Indicator. When pilots replace an older mechanical CDI, the GI 275 doubles as a modern digital indicator and adds MFD-like capabilities such as a moving map, weather, traffic and terrain. left of course and must correct to the right). Use. The shortest path can be determined by the direction from the centre of the instrument towards the course deviation bar. This documentation is copyrighted as part of the intellectual property of the International Virtual Aviation Organisation. The bearing pointers simply point to the selected navaid or waypoint programmed into the navigation equipment. The HSI is an improvement on the standalone CDI instrument in that it takes into consideration your actual heading. Functions like a normal fixed CDI; OBS knob selects the radial by turning the actual course pointer and CDI needle; Glide slope Pay attention that the reading is in function of the radial course and not the heading of the aircraft. When configured properly, you can fly the LOC BC approach with normal sensing, and fly "to the needle" like you do in all other navigation. Propeller driven aircraft require designers to choose early in the design process to use a pusher configuration or a puller configuration. 8) Heading select bug (only for HSI) Each layout has its advantages and... Hi, I'm Charlie. your current heading, only the VOR radial you have tuned with the OBS. The VOR is located in the sector between 160° and 070° as we are in the TO region. The CDI button is used when you have an external mechanical HSI or CDI. HSI . That’s where the HSI (Horizontal Situation Indicator) comes The BRG softkeys display GPS and VOR/LOC (NAV) choices based on installed navigation equipment. link to This Is Why Clouds Are Often Turbulent, link to Pusher vs. Puller Propeller Aircraft Compared, course you want to fly off of a navigational aid (controlled by the OBS – note this doesn’t move the outer ring like a CDI but instead moves the course needle within the HSI to the heading you select). can either be its own standalone instrument (used for VOR navigation) or it can Steam Gauges: 7 Factors Compared; CDI, HSI, OBS, and Heading Selector Explained; Heading, Track, Bearing, and Course Explained; What’s the Difference Between True and Magnetic Heading?