I see so many plates that contain lines of minima requiring the use of DME, but the title does not indicate DME is required. For example, the "LOC RWY 27" approach into CYYJ. The title indicates that DME is not an additional navigation requirement, however the line of minima (only one in this case) says the opposite (LOC/DME, meaning DME is required). Why is it not then titled "LOC/DME RWY 27"? The CAP GEN says that any additional navigation requirements are indicated within the minima lines of the approach, so if there is only one minima line requiring the use of certain equipment, why is it not in the title?
Most likely from amendments over time. Here is the current version of this approach:
and an older version:
As you can see, the older version has circling minima in addition to the LOC/DME minima. From a literal reading, circling to land does not require DME, thus why this is not called LOC/DME RWY 27.
However, there doesn't seem to be any way to identify the FAF or the MAP without DME. I can think of a couple possibilities here:
- The plate has had errors in all its forms.
- On some previous form of the plate, there was some other method to identify the FAF and MAP. Perhaps outer and middle markers? Thus, at some point, this approach could be flown without DME, and the name has stuck.