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ILS Becoming a Localizer Approach

Asked by: 3698 views Instrument Rating

Hi everyone,

I'm getting close to the IFR checkride and have a question on localizer approaches. We're taught during IFR training that if the glideslope fails while on the ILS, the approach reverts to a localizer approach, and we use the appropriate MDA on the chart, in lieu of the ILS DH.

My question is this-what if an approach is printed as an ILS approach only? Consider the ILS Rwy 26 into Astoria, Oregon (http://www.airnav.com/airport/KAST). The upper right hand corner indicates that the approach is "ILS RWY 26" as opposed to "ILS/LOC RWY 26." There is no MDA for a loc approach, no time table, and no indication of where the missed approach point would be (if we couldn't identify it by the DH). If the glideslope fails, we immediately go missed? How would we identify the missed approach point if that happened?


2 Answers

  1. Jim MacKay on Jan 28, 2013

    It appear to be an ILS ONLY. As you probably know the DH is very low for a LOC appch.
    If the glide slope fails I would go missed.
    If the glide slope fails during the approach, descend no further. The OM is 5.5NM to Rwy 26, and DME is required, that in my opinion would be the missed approach point

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  2. Wes Beard on Jan 28, 2013

    Since the approach is ILS only and the GS is required you must go missed and proceed to the MAP before you turn for the missed approach procedure.

    You cannot turn before passing the missed approach point. Period. The question you should be asking now is how do you identify the missed approach point if that requires being on glideslope at the DA?

    The KAST ILS 26 is pretty easy as the procedure is straight ahead and hold at the VOR at the airport. It isn’t always that easy though. See ILS 16R in KRNO

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