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Localizer front/back course and reverse sensing
During my instrument training, I learned that I would have "normal"
CDI sensing whether flying in the localizer front course or out the back course. However, At our local International airport (Sacramento, CA), one of the runways (16R/34L) has an ILS on both 16R and 34L, although the ILS for 34L is currently out of service. While flying the ILS approach to runway 16R, I was to continue straight out after a touch and go, so I planned to follow the localizer. The D.E. with me said that I would have reverse sensing while flying out the back course. What!?! That's not what I learned. While flying out, I noticed that the needle displaced further while he was 'correcting' in what I felt was the wrong direction. This seemed to make my point, but he then said that I was getting 'correct' sensing due to the fact that that particular runway has an ILS on both ends, both on the same frequency. OK, this gave me pause - I had never noticed that before. In looking at the ILS 16R and ILS 34L approach charts, they both are on frequency 111.1 - although they have different Identifier codes. How does this work? I thought the Localizer antennas operated in both directions, ahead of the antenna and behind as well. When they both use the same frequency, are they omni-directional? Assuming they are omni-directional, does that mean you will receive both signals while overflying the runway? Given that the ILS for 34L was out of service, there is no doubt that I should get normal sensing while flying out the back course, however both my CFII and the Designated Examiner had this reversed. How can a lowly student be correct and his CFII and Designated Examiner be wrong? -- Mark Hansen, PP-ASEL, Instrument Airplane Sacramento, CA |
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