TLD is the critical DME ( station). Its about 20NM NW of Narita. So as described above, if flying an aircraft without GPS (or a NOTAM that terminal RAIM is not available during the expected time using the SID ) and the Criticial DME is NOTAMed inop then fhe RNAV 1 route ( SID or STAR ) is not available for use if the DME GAP exceeds the aircrafts limit ( Category C aircraft limit is 14NM ).
A conventional SID would need to be requested.
Last edited by RUMBEAR; 23rd October 2019 at 21:43.