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ILS Y RW27 – The procedure turn from YK LOM, Remain within 10 nm

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ILS Y RW27 - The procedure turn from YK LOM,  It says to remain within 10 nm. Where is the 10 nm to be measured from? I believe it's YKM VOR because I'm fairly certain that the YK LOM has no DME.  Can someone who knows please confirm or explain and provide reference to your explanation. Thanks.

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3 Answers



  1. John D Collins on Aug 18, 2017

    My reference is the chart. It shows in the profile view that the PT begins at YK LOM and the note says Remain within 10 NM. It is obviously 10 NM from YK LOM, the YKM VORTAC is not even in the profile view. One determines distance by ground speed and time. At 120 Kts, 10 NM is 5 minutes, so to remain within the 10 NM limit, I would begin the course reversal no later than 3 minutes after passing YK outbound.

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  2. Russ Roslewski on Aug 18, 2017

    The distance is always from the PT fix, which is the fix depicted on the chart. Whether or not there is any way to directly measure the distance is not a consideration.

    Remember, Procedure Turns existed a long time before there was any way to directly determine distance – before DME.

    You use your best estimate of airspeed, ground speed, wind direction and time to stay within that 10 nm.

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  3. Tom on Sep 21, 2017

    I too have the same question. Remain within XX NM from what? The IAF? The FAF? The Navaid? I’ve looked at several plates and have found all are true! Where is it written for an instrument student to read that defines the point of reference to measure the XX NM distance from.

    I have searched the word “remain within” in the FAA “Instrument Procedures Handbook”, dig around a little in the AIM, searched some in jeppesen Instrument/Commercial book, ASA instrument book and I still have yet to find a reference. Good news is I’m not finished researching.

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