Thanks, I am still playing devil's advocate ... failed ISIS is a local caution, as there are (in general) no ECAM warnings for items in forward field of vision on the main instrument panel. What about the same failure at 1800 ft AAL?
PS: I wish this was in FCOM
The ISIS should be considered at the planning stage i.e. before you commence the approach.
exactly how I feel about it. But it ain't. And there's MMEL for dispatch.