I had an HSI in an aircraft I flew recently that had a bit of friction between the indicator and the compass cards and changes like that would see the indicator "catch" the compass card introducing error doing it repeatedly while flying with a single HSI would compound the error significantly I also dont like to change it when trying to do single VOR operations and establishing on the localizer since having to change back and forth between VOR tracked radial to LOC tracked approach course requires a fair bit of attention. So in the case of my local airport, I like to set OBS to 240 for heading 245 while my Instructor wants 245 for runway 240. Plus my runway numbers not the actual heading. I like to set the OBS like I said, I recognize its a good practice to have but I dont mind when its not perfect, especially during the initial turn to final. I've flown the back course with the HSI set to the "correct" heading and just flew it with reverse sensing didnt really think about flipping it 180 and having it sense correctly. NOTE: This is not a best practice question but one of base/actual functionality.Ĭlick to expand.Good point. So will the CDI needle be accurate for a Localizer approach regardless of the selected OBS as I believe or are my instructors correct in stating that the OBS must be set to the runway heading for the CDI to offer the correct course information? I plan to test my theory the next time I go up but its been a question that's been eating at me all afternoon and I dont fly again until Tuesday so here I am. So while I know its a good practice to set the OBS to be in agreement with your actual heading, especially when flying instruments, I dont believe the information my instructors have given is correct. Its also therefore my contention that it is impossible to reverse sense a localizer when flying TO it (I know many in the Localizers in the US broadcast in both directions such that flying through the localize will give you reverse sensing but flying to the airport gives you a non-precision approach to the opposite runway using the Localizer backtrack) It's my contention that if the Runway heading is 270 and I set my OBS to anything other than 270, my CDI needle will still be accurate as it disregards the OBS and only tracks the 270 course to the runway. It is also contrary to my own experience: I've flown the localizer before albeit not in instrument conditions/under the hood and using an HSI instead of a VOR/CDI and I know I didnt change the OBS and I am fairly certain the OBS heading was not set to the runway though the Localizer worked just fine. This is contrary to my own interpretation of how the localizer works: That being a directed signal that is always broadcasting the same "message" unlike a VOR that broadcasts one signal a "message" for "north" and a second "message" for "bearing" that moves at a constant rate from heading 0 to 360 which the nav radio interprets the time between the "north" signal and "bearing" signal to calculate the correct radial you are following. They've both told my my OBS has to be set to the runway heading for the localizer. That being said, I've had 2 instructors now both tell me the same thing that I believe to be incorrect regarding a localizer approach. 141 gives me access to a full-time instructor so I dont have conflicts with my instructor's day job.īeing new to IFR, I'm obviously looking to my instructors for instruction and know my own knowledge may be incorrect. So I've finally started my instrument training and I've decided to go 141 for it because I want to be thorough but get through it "quick" which is to say I dont want to spend days/weeks between flights coordinating with my instructor for availability.
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