If you are cleared for a RNAV approach and lose the vertical guidance I'm not going to even think about trying to get the G/S from the ILS.you have not been cleared for that approach. I don't know about but I am doing a missed approach. Quoting bueb0g ( Reply 6): The G/S should be more accurate than the aircraft's internal/ GPS vertical guidance anyway so you might want a backup, esp if there's high ground and low viz. I agree 1000% and would not even hesitate to do the ILS especially if the weather were close to minimums.that's a "no brainer". Quoting bueb0g ( Reply 6): However, if the ILS were active and usable I'd expect any crew would default to using that rather than flying a GPS approach. Quoting bueb0g ( Reply 6): Just because you're on the megenta line doesn't mean you're necessarily on course, it just means the a/c thinks you are.Īctually, if you have GPS updating, you will be right where you are supposed to be (Excluding non WGS-84 areas). Personally, I know pilots who when practicing visual or raw data approaches and thus have their ILS indications and FD turned off, will have the other pilot's PFD turned into the ILS and have the diamonds showing, so the PM can more effectively monitor the flightpath and make sure the PF, who is flying a visual approach, doesn't get too far off the preferred centreline and GS. Of course again, in that situation, it makes much more sense to fly an ILS approach and use GPS guidance and DME checks as the backup.īut still, the point remains that you can have a GPS approach with the ILS diamonds on the PFD. The G/S should be more accurate than the aircraft's internal/ GPS vertical guidance anyway so you might want a backup, esp if there's high ground and low viz. Quoting mmo ( Reply 5): Also, the vertical guidance might not match up with the g/s transmitter. However, if the ILS were active and usable I'd expect any crew would default to using that rather than flying a GPS approach. Just because you're on the megenta line doesn't mean you're necessarily on course, it just means the a/c thinks you are. Just like the way you do a DME check during a low viz ILS approach to make sure that your indications are indeed accurate, you may well want to have tuned the ILS to assure the accuracy of your GPS navigation. Well it's obviously not necessary but I know pilots who prefer to have a backup. Quoting mmo ( Reply 5): Why would you want the additional guidance? As long as it's on the magenta line you are where you should be.
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