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which procedure turn?

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wsh View Drop Down
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    Posted: 09 Feb 2018 at 6:30pm

a couple of weeks ago I was flying approaches at Rotterdam (EHRD) airport.

For one approach I asked to do the full approach including procedure turn and did it on autopilot in GNSS mode.

I was surprised to see that the IFD540 chose to do the procedure turn for cat c & D aircraft (which is a bit larger turn obviously for higher speed).

How can I see and know what procedure the IFD will chose?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote wsh Quote  Post ReplyReply Direct Link To This Post Posted: 09 Feb 2018 at 6:39pm
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DavidBunin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DavidBunin Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 2018 at 11:20am
That is interesting.  I suspect the real answer is that it is doing neither.  The procedure turns I am used to in the United States are all a 45° turn from the approach course.  In this case, that would be a heading of 282° which is between the 273 and 291 shown on your chart.

While I am far from an expert, I don't recall having different procedure turns for aircraft categories on my NOAA approach plates.

With any luck, a more experienced instrument pilot will also reply.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mfb Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 2018 at 12:12pm
In the US you can do anything you want to accomplish a course reversal (procedure turn), as long as you stay in the protected airspace.  That airspace is defined by the US Standards for Terminal Instrument Procedures (TERPS). I'm sure that the TERPS accounts for aircraft speed, but I have never seen a specific differentiation between category A, B, C, and D aircraft.

I have no idea if European standards are different from the US ones.

I suspect that David is correct. The IFD is simply doing a generic course reversal which stays in the protected TERPS airspace. It's probably not trying to follow a specific line on a chart. But that's just a guess.

Mike

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Post Options Post Options   Thanks (0) Thanks(0)   Quote AviSteve Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 2018 at 10:22am

Historically, in cases where there were different paths for different categories of aircraft, Jeppesen would code the database for the highest category of aircraft.  That's why you're seeing the larger procedure turn.  For several years, however, they have been adding the differing paths as separate transitions, using trailing numerals to provide a distinction in the name.  For instance, at Townsville airport in Australia, the VOR/DME19 approach has a transition named "TL" having different paths for A/B and C/D categories.  In that case, the C/D transition is named "TL1" and the A/B transition is named "TL2".

For whatever reason, Jeppesen hasn't coded every one of these kinds of approaches with separate transitions.  I asked our contacts at Jeppesen specifically about the Rotterdam ILS06 approach and they have confirmed that they will add the cat A/B transitions in cycle 1804.  They will also add an A/B transition for the VOR/DME 06 approach.
Steve Lindsley
Avidyne Engineering
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Post Options Post Options   Thanks (0) Thanks(0)   Quote paulr Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 2018 at 6:25pm
Thanks, Steve. I appreciate you being willing to jump in and give an engineering-based answer, and even more so that you went to Jepp to get them to fix the issue. May your reign be long.
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