nessuno0505 Posted November 4, 2021 Posted November 4, 2021 Manual says TACAN and ILS are mutually exclusive: using both ADI and HSI they cannot show indications at the same time on the same instruments. Nevertheless, TACAN and ILS button can be selected at the same time, thus resulting in a strange behaviour on HSI and ADI. Is this correct? Shouldn't activating one automatically turn off the other?
ASAP Posted November 4, 2021 Posted November 4, 2021 (edited) The NMSP's behavior is correct. You can only get the needles and course info for one navigation source at a time. If you have the TACAN called up and you press ILS the needle will switch from showing you TACAN info to ILS info. However, a lot of ILS approaches still require the TACAN for DME information on the approach so you would want them both selected. If the DME source is paired with the localizer you'd still leave the TACAN selected and just dial in the paired DME channel in the TACAN. Edited November 4, 2021 by ASAP 2
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