What is the A380 procedure if you receive an EICAS Message "Pax door unlocked" at cruising altitude? Manually switch of pressurization and land ASAP? Or does the bus depressurize automatically in that case, just to prevent an explosive event (which potentially is much worse) ?
Almost certainly the same as any other airliner:
- Do nothing if Pressn seems normal
- If Pressn not normal, action as per Pressurisation e.g. descend as required to MSA/FL100
Doors are usually (now) "plug" type so pressurisation holds them closed.