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Obstacle clearance on precision and non precision approach.

Asked by: 2860 views Commercial Pilot, FAA Regulations, Flight Instructor, General Aviation, Instrument Rating

Good morning, 

First of all, I would like to say " happy parents day!" to those who are going to celebrate parents day. I always appreciate your help and support and this time I came up with question regarding intstrument stuff.

 

I have done most of research and read relevant  articles and yes, I understand that they both provide 300ft clearance on approach path, but I would like know where it comes from.

I appreciate your ideas and comments !

 

Steve.

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1 Answers

  1. Best Answer


    John D Collins on May 08, 2016

    Obstacle clearance on a precision (or vertically guided approach) is based on surfaces that are sloped where the clearance is reduced as you get closer to the runway. With non precision approaches, the ROC (Required Obstacle Clearance) is fixed after passing the FAF or a step down fix inside the FAF and is a level surface between the FAF and the MAP. The value of the ROC varies by approach type, but can be as little as 250 feet above the highest obstacle.

    This is a complex topic, particularly for various vertically guided approaches, and involves multiple FAA orders, particularly 8260.3 and 8260.58. You can google and download these orders, but understanding them involves a good understanding of IFR approach operations and a good math background.

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