IN Brief:
- The five-year A$32 million contract covers preventative, corrective, and priority maintenance for Royal Australian Navy Mk 45 guns.
- Hobart-class weapons will be refurbished as the destroyers progress through their capability-enhancement programme.
- BAE Systems Australia’s Henderson workshop is one of two sites worldwide able to refurbish the guns and replace bespoke components.
BAE Systems Australia has secured a five-year A$32 million contract to continue sustaining the Royal Australian Navy’s Mk 45 naval guns, extending an engineering workload spanning the Hobart-class destroyers and Anzac-class frigates while Australia prepares the same gun family for its future Hunter-class fleet.
The Commonwealth contract covers preventative, corrective, and priority maintenance for each Mk 45 operated by the Royal Australian Navy. It also includes refurbishment of the guns fitted to the Hobart class as those ships move through the Destroyer Capability Enhancement programme. HMAS Hobart’s Mk 45 is already being refurbished at the Osborne Naval Shipyard in South Australia, tying the support package directly to the destroyer upgrade cycle.
The Mk 45 is a 5-inch, or 127mm, lightweight naval gun used for surface combatant fire support and ship defence. Australia has operated the system for decades, and the latest sustainment award now spans three fleet generations: the Anzac frigates still in service, the Hobart destroyers undergoing capability enhancement, and the Hunter anti-submarine warfare frigates progressing through construction.
Most of the sustainment activity will be carried out at BAE Systems Australia’s dedicated Mk 45 workshop in Henderson, Western Australia. The specialist team there has supported the weapon since the Anzac class entered service in the 1990s. BAE Systems says the Henderson facility is one of only two sites worldwide able both to refurbish the gun and replace bespoke components, giving the Australian operation a deeper engineering role than routine shipboard maintenance.
The overlap between three fleet generations increases the configuration burden around the weapon. The Anzacs are ageing assets whose availability has to be protected while replacement programmes mature, while the Hobarts are entering an upgrade period in which weapons, sensors, and combat-system changes have to be managed around scheduled maintenance and shipyard capacity. At the same time, the first Hunter-class frigate has reached keel laying at Osborne, bringing a new production programme into the same naval industrial system.
Gun sustainment therefore becomes a configuration-management task as much as a maintenance one. A Mk 45 installation has mechanical, electrical, control, ammunition-handling, and combat-system interfaces that have to remain aligned with the host ship. Refurbishment can restore life to major assemblies and replace worn or obsolete components, but the workshop also has to retain engineering data, tooling, test capability, and supply routes for equipment that may remain operational across several ship classes for many years.
Australia is placing more naval sustainment work into longer-duration lifecycle arrangements. Babcock and Saab recently secured a five-year Anzac sustainment role covering engineering, spares, and asset management. The Mk 45 award is narrower, but both programmes create recurring workloads intended to retain specialist people and facilities rather than rebuild capability for individual maintenance periods.
Henderson and Osborne perform different functions within that system. Henderson is an established sustainment precinct, while Osborne is the centre of the Hunter build and the current Hobart gun refurbishment. Moving equipment between ship, workshop, and upgrade yard requires planning around vessel availability, transport, acceptance testing, and reinstallation. As combat-system integration becomes more complex, weapon refurbishment cannot be treated as an isolated mechanical activity.
The contract also gives BAE Systems Australia continuity as the Mk 45 remains part of the future fleet. Hunter-class frigates are expected to use the gun, allowing the workforce supporting today’s Anzac and Hobart installations to retain knowledge that remains relevant when the new ships enter service. That continuity reduces the risk of losing specialist skills during the transition between an ageing fleet and its replacements.
Long-term support will also depend on parts availability. Mature weapons can remain operational for decades after individual components or manufacturing processes have become obsolete, forcing sustainment organisations to manage repair, remanufacture, replacement, and configuration approval together. The ability to replace bespoke Mk 45 components at Henderson gives the Australian support system more control over that problem than a model reliant entirely on overseas refurbishment.
For the Royal Australian Navy, contract performance will ultimately be visible through gun availability rather than the headline value of the award. Turnaround time on corrective maintenance, refurbished-assembly quality, spare-parts availability, and the ability to support Hobart upgrades without disrupting ship schedules will determine how effectively the arrangement supports the fleet.
The Mk 45 is already a mature weapon, but maturity does not remove its engineering burden. Keeping one gun family supportable across Anzac, Hobart, and Hunter requires a persistent industrial base behind it, and the five-year contract gives the Henderson operation another planning horizon over which to retain that capability.
