February 12, 20188 yr I'm about six months into my sim career, so please give this noob a little altitude... something I haven't had much luck resolving with research, is DH/MDA, and how to properly use this. My question is do you use both of these, or just one? On approach plates, you get two minimum altitudes take KMDT ILS LOC RWY 31, you have both 558/50 and 250/(300-1). Can someone give me a quick rundown on the intended usage? I'd really appreciate the help.
February 13, 20188 yr Use MDA (barometric) for a CAT I ILS, or any non-precision approach. Use DH (radar altitude) for CAT II approaches. You’ll see RA listed in the minimums as a reminder to use DH, KMDT ILS 13 CAT II & III for example. Brian W KPAE
February 13, 20188 yr generally a good explanation regarding the subject : How to get the correct approach minimum : 1. A320 home cockpit (FSLabs, Skalarki), P3Dv5 Main PC : I7-12700K, GTX3080Ti 2. FSLabs A3xx, P3Dv5. Gigabyte Aorus 17G YC, I7-10700K, RTX 3080
February 13, 20188 yr Author Ok, a little follow up, the landing category you are in is determined by your Vref, which in turn is determined in part by the aircraft's weight. Roughly speaking, unless you are in an aircraft with some pretty wildly varying performance characteristics, you will always be in the same landing category. Am I on the right path? Thank you for your help with this.
February 13, 20188 yr 1 hour ago, srmj71 said: Roughly speaking, unless you are in an aircraft with some pretty wildly varying performance characteristics, you will always be in the same landing category. Am I on the right path ? Theoretically yes, but the speed border between two categories can be just near the middle of your Vref range. E.g. the border between Category B and C is a strict 121 kt. If you look at the Dash-8 speed cards, you`ll find that border depending on weight for every Flap setting. Mike 1. A320 home cockpit (FSLabs, Skalarki), P3Dv5 Main PC : I7-12700K, GTX3080Ti 2. FSLabs A3xx, P3Dv5. Gigabyte Aorus 17G YC, I7-10700K, RTX 3080
February 13, 20188 yr Commercial Member Interestingly enough, I just posted this to another user! Must be something in the water! LOL!!! I've provided a link to a PDF that I created from an AVSIM discussion on about Decision Height vs. Decision Altitude a few years ago and some additional information I had added. I gave this to new pilots who would come fly with us. I think/hope it will be helpful to you. Decision Height vs. Decision Altitude PDF Download Best wishes! Dave Hodges System Specs: I9-13900KF, NVIDIA 4070TI, Quest 3, Multiple Displays, Lots of TERRIFIC friends, 3 cats, and a wonderfully stubborn wife.
February 14, 20188 yr Author I really appreciate the time you guys took to help me out with this. I'm so badly hooked on the sim, that when I can't figure something out, it eats at me... something fierce. Take care, Steve
February 14, 20188 yr Commercial Member 2 hours ago, srmj71 said: when I can't figure something out, it eats at me... something fierce. Proof we have the makings of a great and knowledgeable flight simmer right here in front of us! Nice. Very nice indeed! Dave Hodges System Specs: I9-13900KF, NVIDIA 4070TI, Quest 3, Multiple Displays, Lots of TERRIFIC friends, 3 cats, and a wonderfully stubborn wife.
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