KOREA AIF question.
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Hello Forum.
In the KOREA AIF, most airfields use IAFs located on radials emanating from that airfield eg Choongwon (page 60) has Honey on radial 095.
Some, however, eg Suwon (page 147) use an AIF emanating from a different airfield. In this case Osan.
As I am not a “real” pilot, so could you explain why this procedure is used.
Would it not be easier to use say, 160 from Suwon?
Finally, if using 070 from IAF Osan, does one have to use Osan TACAN 094X and then switch to 022X for final ILS approach to Suwon?
Thanks,
Bayonet.
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Not a real pilot either, but if you’re talking about these two approaches, the direction of flight out of the IAF already makes it clear why you’d want to use another source than the airfield’s own beacon.
Basically, from the IAF, there’s no direct line towards the field that would line you up with the runway. There is the option to fly direct, pass overhead and do some kind of teardrop pattern but that’s not very efficient. You could do what you say, i.e. create a new IAF that IS referencing the airfield’s own beacon, but it’s far easier to manage a flow and separate traffic when they’re using 2 or 3 nav points, than it is when they each have their own, especially in congested airspaces with multiple airfields close together.
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Hi Eagle Eye
I think understand your point, my fault if I don’t.
Not to be argumentative, but, it’s only the ILS approach I’m referring to.
Why not fly a DME arc using a Suwon radial as in the ILS approach to Choongwon, that’s what I don’t understand.
Also, if using the AIF from Osan, does that require using two TACAN frequencies?Many thanks
Bayonet.
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ILS/VOR/DME equipment is expensive, not every airfield has/maintains it, or has redundant systems, or has the localizer AND the XXX, etc… If the fields are close enough to use the same equipment to effect an approach on both, it’s economically sound to do so.
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Thanks for that MorteSil, that ties in with Eagle Eye’s answer.
Thank you both.
And my question about using two TACAN frequencies?
Bayonet.
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I think understand your point, my fault if I don’t.
Not to be argumentative, but, it’s only the ILS approach I’m referring to.An ILS chart is always a full procedure to get from IAF to the runway, as you must be able to use it without interaction with ATC, and both sides need to know where a pilot is going: a pilot in order to know when he’s approaching the runway, ATC to separate other traffic. As such, they are one and the same.
Why not fly a DME arc using a Suwon radial as in the ILS approach to Choongwon, that’s what I don’t understand.
The main reason I see for Suwon not having a DME arc would be the airspace you need for one, which you don’t have in that area, especially with Seoul and Kimpo Intl. Airports (which, given their status and importance would take priority IRL) and the highly-populated urban areas that close.
Also, if using the AIF from Osan, does that require using two TACAN frequencies?
For the TACAN RWY 14 approach, yes. You’d follow SOL TACAN until 13DME, and then turn left to intercept SWN TACAN.
ILS RWY 32, however, would only require tuning and following the TACAN from Osan (using TCN-mode) until you reach 4DME. At that point, you’d turn left and switch to NAV-ILS to establish on the localizer. -
ILS RWY 32, however, would only require tuning and following the TACAN from Osan (using TCN-mode) until you reach 4DME. At that point, you’d turn left and switch to NAV-ILS to establish on the localizer.
This is wrong. You must switch to ILS/TCN (and not to ILS/NAV), because you need also the DME reading at HSI, that comes from the TACAN station!
With ILS/NAV you can have the signal of Localizer and Glide slope, but the DME at HSI will read the distance from the current steerpoint (STPT) ;).
Nikos. -
This is wrong. You must switch to ILS/TCN (and not to ILS/NAV), because you need also the DME reading at HSI, that comes from the TACAN station!
With ILS/NAV you can have the signal of Localizer and Glide slope, but the DME at HSI will read the distance from the current steerpoint (STPT) ;).
Nikos.Are you sure? Not that I doubt your knowledge on the topic, it’s just that it’s not indicated on the chart, as far as I can see?
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Are you sure? Not that I doubt your knowledge on the topic, it’s just that it’s not indicated on the chart, as far as I can see?
Hey “Eagle-Eye” my friend, yes I’m definitely sure.
Of course you can check me, see “BMS-Manual.pdf” (4.32) at page 50 ;).
About your question that “it’s not indicated on the chart”, in some way it is. You have a procedure that based to a TACAN station and NOT having an RNAV(GPS)/ILS approach in order to switch to ILS/NAV (this situation stands only for BMS - I never saw an RNAV(GPS)/ILS).
Nikos.P.S. In order to clear the “this situation stands only for BMS”, means that for any reason can be possible. Doesn’t mean the recreation of a real procedure!