CaptainMidnight:
Given that NF lies well within airspace controlled and managed by Airways NZ, I can't imagine why Airservices/BNE CEN would be providing FIS for NF, particularly since they wouldn't know about traffic proceeding there from the east and the Pacific.
Normally, I would concur but, as per my subsequent post #319, I think the responsibility for providing the FIS for YSNF "fell through the cracks" between the Australian and NZ civil aviation agencies when the Norfolk Island FSU closed. And the NZ AIP references would appear to imply that NZ still thinks the FIS responsibility for Norfolk Island lies with Australia.
As you would be aware, prior to its closure in the '90s, the NF FSU used to hold the FIS responsibility for advising aircraft on NF weather during its hours of operation even though it was located within the Auckland Oceanic FIR. Outside of the FSU's hours of operation, the FIS responsibility reverted to the Sydney FSC and subsequently to the BN FSC when the Sydney FSC was closed. My understanding is that the FIS responsibility was totally transferred to the BN FSC when the Norfolk Island FSU was finally decommissioned.
I'm proposing the view, that the issue of Norfolk Island FIS responsibility may have been overlooked by Airservices/CASA/CAANZ/Airways either when the FSU closed or with the subsequent institutional changes implemented by Australia (i.e the integration of ATC/FS functions) as well as the change to the Flightwatch "self help concept" in lieu of the directed FIS.
It's this issue that requires investigation and comment on by the ATSB and, if necessary, be the subject of a safety recommendation so that the appropriate MoU/LoA remedial action, as you have proposed, is implemented between the Australian and NZ agencies so that we don't have a repeat of this situation again in the future.