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#1
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Why is ADF required on ILS approach?
Wait! He can use a GPS in place of the ADF on that approach. Isn't that
correct? Rich Raine www.eraine.com "Brien K. Meehan" wrote in message ... "Gig Giacona" wrote in message ... And the ILS plate is marked ADF required? Why is that? ... because you need to know where the LOM/IAF called LADOS is. It's an IAF, so there's no previous fix from which you can start timing to find LADOS. DME is not required, so you can't assume you can use it to find LADOS - yes, even though it's clearly marked 5.2NM on the plate. If you want to get into ELD without an ADF, you'll have to use one of the other 3 approaches. Those aren't terrible options. |
#2
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Gig,
the initial approach fix (IAF) is defined by the NDB. how would you find this point without an ADF? You'd get around that with radar vectors, but you couldn't fly the full procedure without the NDB. And the missed approach is a hold on the NDB. Same problem. BUT: An approach certified GPS with the NDB in it's database can replace for the ADF. -- Thomas Borchert (EDDH) |
#3
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On Tue, 8 Jul 2003 14:18:55 -0500, "Gig Giacona"
wrote: I've not been flying in a while and don't have an IR. But I plan to get one as soon after I finish building my plane. I was looking at this approach plate for my home field http://www.myairplane.com/databases/...l/ELD_ir22.pdf or http://tinyurl.com/gcjc And the ILS plate is marked ADF required? Why is that? PPSEL R-H My Zodiac 601XL www.peoamerica.net/N601WR Two reasons -- the (one and only) IAF is defined by the LOM, and that is also the missed approach fix. An ILS approach still has the missed approach as a integral segment. |
#4
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"Brien K. Meehan" wrote in message ... It's an IAF, so there's no previous fix from which you can start timing to find LADOS. DME is not required, so you can't assume you can use it to find LADOS - yes, even though it's clearly marked 5.2NM on the plate. If you want to get into ELD without an ADF, you'll have to use one of the other 3 approaches. Those aren't terrible options. You're ignoring the feeder route from ELD to LADOS. |
#5
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"Thomas Borchert" wrote in message ... or an approach certified GPS with LADOS as a waypoint, right? The GPS does not need approach certification. |
#6
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Thomas Borchert wrote: Wait! He can use a GPS in place of the ADF on that approach. Isn't that correct? I think so. But: Does the GPS need to be certified? If so (and I think so), does it need to be approach certified or is enroute sufficient? Certified, enroute/terminal suffices Sydney |
#7
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Brien K. Meehan wrote in message ... "Gig Giacona" wrote in message ... And the ILS plate is marked ADF required? Why is that? ... because you need to know where the LOM/IAF called LADOS is. It's an IAF, so there's no previous fix from which you can start timing to find LADOS. DME is not required, so you can't assume you can use it to find LADOS - yes, even though it's clearly marked 5.2NM on the plate. 6.5 DME |
#8
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Let's see if I have this straight and please forgive any ignorance on my
part. When I got my PP-SEL in ELD '79-'80 there was no ILS or NDB approach at ELD just VOR. All the pilots bitched including the Lear and Citation pilots and their bosses and ELD gets an ILS. But it gets put in requireing ADF that even then was on the way out. This is the silliest thing I have ever heard of. "Thomas Borchert" wrote in message ... Gig, the initial approach fix (IAF) is defined by the NDB. how would you find this point without an ADF? You'd get around that with radar vectors, but you couldn't fly the full procedure without the NDB. And the missed approach is a hold on the NDB. Same problem. BUT: An approach certified GPS with the NDB in it's database can replace for the ADF. -- Thomas Borchert (EDDH) |
#9
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"Dave Butler" wrote in message ... Oh, right, sorry. I lost sight of the original premise, an ILS with ADF REQUIRED. So what I should have said was: "I think the alternate missed approach instructions still don't relieve the pilot of the requirement for carrying an ADF as explicitly stated on the approach chart." You're viewing the note "ADF REQUIRED" as having legal authority. I view it as just a reminder that ADF is needed to fly the full approach, the missed approach segment in this case. This isn't the first time this matter has been discussed in this forum. As I recall from previous discussions, nobody was able to present any definitive documentation in support of either view. But logic tends to support the view that these notes are just reminders to the pilot. Take a look at most LOC BC approaches and you'll find a similar note that says "BACK COURSE". Is that a legal requirement that a back course receiver must be aboard to fly the approach, or is it just a reminder of reverse sensing? |
#10
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"Gig Giacona" wrote in message ... Let's see if I have this straight and please forgive any ignorance on my part. When I got my PP-SEL in ELD '79-'80 there was no ILS or NDB approach at ELD just VOR. All the pilots bitched including the Lear and Citation pilots and their bosses and ELD gets an ILS. But it gets put in requireing ADF that even then was on the way out. This is the silliest thing I have ever heard of. New NDBs are still being commissioned in the US. Stan |
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