[Another 2 hour flight wasted!]

I posted about this a bit before. It is a big no-no to touch the MCDU on approach or you will lose the lottery

[321LC CTD changing arrival MROC]

FYI,

I was doing CYUL-MROC this morning. Upon arrival, I tried to change my arrival from BARR3P to BARR3C but I was past PIRAS. The FMC get corrupted for text overwriting lines , then a CTD

 

Full plan

CYUL/06R N0464F360 DCT FAWNS DCT BUGSY DCT SYR DCT SFK DCT PSB DCT MOL DCT GSO DCT SLOJO DCT GRONK DCT WURFL Q83 JEVED Q97 PRMUS DCT OMN/N0451F370 DCT EBAYY/N0456F360 Q93 MCLAW Y442 FUNDI/N0454F370 UM335 ALVEK UM328 UCL/N0458F360 DCT SELEK/N0453F380 DCT BONOS/N0458F370 UZ403 PIRAS BARR3P MROC/07