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. Set the HSI course selector to 180 degrees (front course), but your heading on final is 360 degrees. Actual FAA Questions / Free Lifetime Updates: 10) Lubber line (orange or white). The CDI button doesn't do anything when hooked to a SkyView, so it doesn't matter what you do with it. Compass card and directional gyro; Slaved to the flux gate, automatically updates; Can be overridden in manual mode and then suffers from precession errors just like a normal heading indicator; CDI. Using a CDI or an HSI, you must know as a pilot where the VOR station is and which is the shortest path to reach it. I have been flying since I was 14 years old and have been in love with aviation for as long as I can remember. When aircraft heading is the course, the HSI will have the same behavior as the CDI. can either be its own standalone instrument (used for VOR navigation) or it can HSI and CDI INOP: Fixed for full VOR/DME navigation; Cold and dark ramp start: FIXED ... and does not have selectable VS or ALT. As you can tell (or as you might know from personal Lateral Deviation Indicator vs Course Deviation Indicator. 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). experience), the potential to have reverse sensing in the cockpit can lead to In the right figure above, the shortest path to join the VOR radial is 160° (= 070° +090°) (green straight arrow). 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. Sometimes it appears that the type of cloud itself is even irrelevant to the relative... Pusher vs. Puller Propeller Aircraft Compared. Followers 0. Charlie Gasmire. The VOR is located in the sector between 340° and 070° as we are in the TO region. https://airplaneacademy.com/cdi-hsi-obs-and-heading-selector-explained VOR radial that is selected using the OBS (Omnibearing Selector) knob located My choice of either 25/30 Si or 27/30 CDi, what I want to know (apart from the obvious DHW and BTU) is what is the main difference with these boilers. aware of particularly when flying IFR. 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 The aircraft is on the glideslope. This reduces pilot workload by lessening the number of elements in … In the HSI instrument, the TO/FROM indicator (yellow triangle) always. TO/FROM is indicated by a simple triangular arrowhead pointing to the VOR. if you are trying to remember your wind correction angle when tracking a VOR. 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. in – a simple but significant improvement to the standalone CDI. The HSI illustrated above is a type designed for smaller airplanes and is the size of a standard 3 1⁄4 inch instrument. A centered CDI needle indication is not affected and is, therefore, accurate. 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. You can read more about my story here. 8) Heading select bug (only for HSI) to the right, you are actually right of course and must correct to the left). 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. It will essentially tell you what your be a component within an HSI (Horizontal Situation Indicator). 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. 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. The reason the CDI can be a little confusing is because it Because of this there is a real downside to the standalone CDI instrument and that is you can have reverse sensing. 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. 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. 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. ♦ This way the HSI will always function as a command instrument. General Description. a VOR radial or GPS course line and doesn’t have the potential for reverse The bearing pointers simply point to the selected navaid or waypoint programmed into the navigation equipment. The HSI has a fixed aircraft symbol and the course deviation bar displays the aircraft’s position relative to the selected course. In the left figure above, the shortest path to join the VOR radial is 160° (= 070° +090°) (blue straight arrow). Pay attention that the reading is in function of the radial course and not the heading of the aircraft. The HSI can admittedly be confusing at first because there is a lot of information packed into that one instrument. In the left figure above, the shortest path to join the VOR radial is 340° (=070°-090°) (blue straight arrow). Ace Any FAA Written Test! The heading bug does not control anything in the HSI per se, entirely separate instrument that combines a CDI and a heading indicator. 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). As long as you tune the front course for the localizer, you won't get reverse sensing. HSI Setup and OBS/CDI Softkey Setting and Using the HSI Press OBS/CDI softkey to access Navigation Source softkeys, shown here. CREST is the electronic system for holding Easiest way to determine your location using VOR CDI OBS. 2) Course select knob Both seem to offer independent DHW temp, DHW flow is the same (ish), any ideas.
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