In terms of Mk54 LWT numbers, Naval News reported in
2023 that an unspecified number of Mark 54 Mod 0 Lightweight torpedoes were ordered, which appear to be for the P-8A (only). The SIPRI arms transfer database estimates that 40 were ordered in 2020 and were delivered in 2023. (For comparison SIPRI estimate Australia bought 200 in 2012 which were delivered in 2016, and then an additional 100 were ordered in 2015 which were delivered in 2019).
So this recent announcement for 20 Mk54 for MH-60R, appears to provide a total NZDF inventory of 60 (by 2029/2030, assuming a 3-4 year delivery timeframe going by previous ANZ order/delivery timeframes)? These recent announcements by DoS & DoD note that "air launch accessories" are included.
From this I think we can deduce that the ANZAC Frigates and the SH-2G are continuing to use the existing Mk46 stocks for the time being (and SIPRI report another 13 Mk46 Mod-5 were ordered in 2020).
U.S. approves $69M MK 54 torpedo sale to boost New Zealand’s P-8A and future helicopter ASW capability.
www.armyrecognition.com