MNPS airspace A340
To enter MNPS airspace you require 2 LRNS
If you lose 2 IRU's you would still have 2 FMs, 3 MCDUs and 1 IRU left
If your aircraft also has 2 GPS, would you not still have 2 LRNS as a GPS is counted as a LRNS? ie: 1st LRNS = 1FM/MCDU and 1 IRU. 2nd LRNS 1 FM/MCDU and 1 GPS