Originally Posted by
Boyington
On some VOR DME Charts three different MDAs are mentioned for different DME distances, Can someone please explain. Please see the attachment.
in why it is done. Thanks
They are step down fixes, you cannot fly below those altitudes at those distances, if you do go around. If you want to know why have a look for “VABB
Aerodrome Obstacle Chart Type
-A RWY 32” on the inter web. Some thought needs to be made on how you are going to fly the approach now that you know what the chart is saying. They are charted this way because blindly using VNAV/LNAV may not guarantee obstacle clearance. If you blindly fly a 3.3 degree FPA or a VNAV path that would be rounded to 3.3 degrees you could fly below the step down fixes which compromises the designed obstacle clearance.