Hello actually i cant figured out about DH and MDA on UK IAP Charts ,is there any body who can explain about OCA , or , VM©OCA?or just tell me how can i find DH/MDA?i attached simple BELFAST airport for example,and i want to know if possible the means ofFAP(just an intersection or Final approach ,something!)?ALT/HGTMSATHR ELEVAD ELEVVARon this chart!!!Thank you in Advance

FAP = Final Approach PointALT/HGT = Altitude (above sea level)/Height (above ground) MSA = Minimum Safe AltitudeTHR ELEV = runway threshold elevationAD ELEV = aerodrome elevationVAR = magnetic variance (difference between magnetic and true headings)OCA/OCH = obstacle clearance altitude/heightCheck out http://simcharts.jeppesen.com/help/GlossaryM-O.htm for explanation Hope that helps,-Al

I dont know Diddily Squat about UK procedures, but looking at the plate, it appears the DH/MDA is shown as GP 380(368) ( Go around point??) in the profile view. I'm just guessing based on the airport elevation and what I would expect.

I dont know Diddily Squat about UK procedures, but looking at the plate, it appears the DH/MDA is shown as GP 380(368) ( Go around point??) in the profile view. I'm just guessing based on the airport elevation and what I would expect.

No, GP = Glide Path and the 380FT/368FT altitude/height is for 1.0 DME on the approach, not the Decision Altitude.-Al

No, GP = Glide Path and the 380FT/368FT altitude/height is for 1.0 DME on the approach, not the Decision Altitude.-Al

Tks, but still sounds like a good place for the DH, even if it isn't :( Maybe it's the "OCA (OCH) list then? Heck, I'm surprised the whole thing isn't in meters lol

FAP = Final Approach PointALT/HGT = Altitude (above sea level)/Height (above ground) MSA = Minimum Safe AltitudeTHR ELEV = runway threshold elevationAD ELEV = aerodrome elevationVAR = magnetic variance (difference between magnetic and true headings)OCA/OCH = obstacle clearance altitude/heightCheck out http://simcharts.jep...GlossaryM-O.htm for explanation Hope that helps,-Al

thank you for useful reply ,and what is the DH/MDA on that chart finally?

I think you can find the MDA under OCA CAT I for three aircraft categories.

I finally found this explanation, here ya go, I hope its accurate........"Obstacle clearance altitude OCH is the height on an IAP with the minimumpermitted clearance above obstacles on the final approach. It does not takeaccount the limitations associated with the navaid (system minimum). Thusthe DH or MDH is the higher of the OCH or the system minimum. The OCA isobviously the altitude corresponding to the OCH.For non-precision approaches the OCH is the height of the highest obstacleon the final approach segment plus a speed-dependent margin. Precisionapproach OCHs are more complex, I think. Most Cat I ILSs are limited by thesystem minimum of 200 ft rather than the OCH."

I finally found this explanation, here ya go, I hope its accurate........ "Obstacle clearance altitude OCH is the height on an IAP with the minimumpermitted clearance above obstacles on the final approach. It does not takeaccount the limitations associated with the navaid (system minimum). Thusthe DH or MDH is the higher of the OCH or the system minimum. The OCA isobviously the altitude corresponding to the OCH.For non-precision approaches the OCH is the height of the highest obstacleon the final approach segment plus a speed-dependent margin. Precisionapproach OCHs are more complex, I think. Most Cat I ILSs are limited by thesystem minimum of 200 ft rather than the OCH."

hellothank you man ,i must do some research about this things! at UK procedureany way thank you for you preamble

i did many research about determine OCH/A find this:http://www.jeppesen.com/download/misc/Volume12_Ch10_Page18.pdfbut if any body give me the true number of OCA(or)DH for this case (with explain), i really appreciated