Well, how nice to have found the answer! Thanks for "closing the loop", clandestino. Its of no direct relevance to me, but as I get asked all the technical questions about procedures and plates, etc. its something I can file away for future reference.

Keep in mind that non-standard can also mean....TCH is lower than standard, and with a largish aeroplane one might drag the bogies thru the frangible bits, which would dis-please the respective fleet manager, I would imagine...:}

Clandestino
23L NON STD has an RHD of 48ft the other 3 r/w's have an RDH of 51 or 52 ft
so I think 411A correct it the fact that 23L has a less than 50ft Refrence data height that makes this particular r/w 'Non Standard'

Well it seems that both ways are possible. Can´t verify MUC TCHs at the moment, as my Jeppessen is a couple of hundred miles away, I´ve only posted what I´ve read on LIDO chart for 26R. BTW, is 23 typo or we´re talking about different airports?

Sorry I forgot to mention the airport
I was talking about DUS not MUC