FlyJSH

I was looking at the new DRT ILS. It says "radoar required". Houston Center has radar down to 4000 msl: low enough to get to the feeder route from Laughlin KDF VOR. My question is when radar is required, what does that mean? Is it to the surface or to a feeder route?

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Ewfflyer

Radar Req' is usually when they need the ability to get you onto the final. There most likely isn't a Proc turn or course reversal on the chart.

**Edit, I busted out our new charts and found it. We're studying it compared to the other approaches, and we don't know why it's required vs. any other situation. It has appropriate transitions, and multiple ways to identify the LOM/I-DRT(6) FAF. Good question.

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N9373M

any link to the chart? Airnav and AOPA only shows a LOC approach

Ewfflyer

It's on the new cycle, so won't be available until Apr 8th 0901Z digitally. I happen to have the newest paper version that arrived yesterday.

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IluvRNP

Usually, when there are non-radar terminal routes (one in this case DLF-KOTTI) the radar required note is because flight inspection determined that the localizer performance has some issue for interception. And, with the proximity of the Mexico border they don't want the procedure flown from DLF unless ATC is watching your flight track.

Could be something else, but I suspect it is localizer performance and the proximity of Mexico. Also, the note was on the LOC procedure.

FlyingChipmunk

Is there another way to identify the fixes on the approach? I have seen some approaches that have "DME or Radar required" as a limitation to identify the various fixes on the approach. That way if DME fails or is not installed you can have the approach controller call the fix for you.
Or

It could be that radar vectors are the only way to join the approach.

IluvRNP

Look at the chart.

Ewfflyer

Thing is, the GPS approach pretty much overlays the ILS exactly, but doesn't have any of the radar req'd in the text. There are multiple ways to identify the LOM and transition from the VOR to the LOM for the proc. turn is pretty cut and dry.

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N9373M

I don't have the ILS chart, but could the missed require the radar?

Looking at the LOC, maybe they want you in radar contact to stay away from the antenna farm?

IluvRNP

No, a charted missed approach cannot be predicated on radar.