Originally Posted by
mabg88
I'm curious about the calculations because for the past 9 years I've operated in and out of VNKT shooting the VOR which works well. Now the airport has installed a LOC antenna and they have a LOC only approach. Charted Altitudes and distance to cross check with mcdu are totally off meaning waypoints based on distance are not matching the chart same goes with the altitudes. Was curious to see if the chart was the issue by trying to understand the calculations. Sorry I'm not allowed to post URLs, was gonna show the LOC only app into KTM.
Thank you all for the replies, much appreciated.
The KTM charts from the AIP are available here
https://e-aip.caanepal.gov.np/_uploa...91d30d1ac7.pdf
Last page is the LOC chart.
I haven’t had a looked at the MCDU for the approach, by any chance are these numbers what you are seeing ?
3.1nm 4860 ft
4.5nm 5550 ft
5.5 nm 6050 ft
7.5 nm 7030 ft
10.5 nm 8510 ft
11.5 nm 9000 ft
I worked those out based on a constant 4.637 degree slope between the FAF and the VDP, getting rid of the change from 5.31 to 3 degrees at 5.5 nm.
What does the coding look like in the MCDU, where does it say the descent starts ?
What decent angle is in the database ?
What are the database altitudes vs waypoints ?
Are you flying xLS or LOC-FPA ?
Is the software version on your MCDU temperature compensated for the approach ?