The RNP approach for LGIR runway 27 has the altitudes on some of the points underscored.
I had the impression (and I'm afraid I'm wrong) that these are "crossing restrictions" and the controller can use the "Cancel Level restriction at IR402" in order to waive the restriction. Though this phraseology in ICAO Doc 4444 16th edition is only found under the
Clearances on a SID and
Clearances on a STAR sections but not in approaches.
Unfortunately I don't have access to the Aeronautical Chart Manual (Doc 8697) in order to see if there are more details there.
While searching, I found out that the Belgian AIP goes one step further and has an
(on SID/STAR) comment next to each of the altitude descriptions. Curiously, the
Upper and lower limit got away with it.
To make things even more complex, conventional procedures have similar altitude depictions but on the route and not on the point. From that, I got the impression that this is a MEA (minimum en-route altitude) or something similar, thus different from having the altitude on the point. For reference, older VOR procedure, same airport.
My question: what are the altitudes depicted on the two approach charts? Is it the same concept drawn differently (conventional vs RNP) or is it something else?