Paladin M109A7 155mm Artillery System, United States of America


The Paladin M109A7 next-generation artillery system being manufactured by BAE Systems is a significant upgrade to the combat-proven M109A6 Paladin cannon artillery system. The enhanced artillery system offers key fire-support for a variety of potential combat missions conducted by the US Army's Armored Brigade Combat Teams (ABCTs) in conventional, hybrid, irregular and counterinsurgency combat environments.

The US Army awarded a $688m contract to BAE Systems in October 2013 for the production of Paladin M109A7 artillery systems, with an option to procure a total of 66 vehicle sets including a self-propelled howitzer and an ammunition resupply vehicle. The artillery system was inducted into low rate initial production (LRIP) in May 2014, while full rate production is expected to commence in 2017.

As part of a $195m initial contract, BAE Systems will produce up to 18 vehicle sets, including M109A7 howitzers and M992A3 carrier ammunition-tracked vehicles. The first vehicle was delivered to the US Army in April 2015.

BAE Systems received a $245.3m contract from the US Army to conclude the LRIP of the M109A7 self-propelled howitzers and M992A3 ammunition carriers, in October 2015. The contract exercises the second option year to deliver an additional 30 vehicle sets.

Paladin M109A6 is a cannon artillery system developed by the Ground System Division of United Defense LP (now BAE Systems Land and Armaments) and manufactured at the Paladin Production Operation centre at Chambersburg, Pennsylvania.

Development of the M109A7 artillery system

The US Army and BAE Systems signed a memorandum of understanding for the Paladin integrated management (PIM) programme to upgrade the M109A6 Paladin self-propelled howitzer and its associated M992A2 field artillery ammunition support vehicle. The authority intends to procure 580 sets of PIM vehicles, which are expected to sustain through 2050.

The PIM modernisation effort was launched in 2007 and was followed by the award of a $63.9m research and development contract to BAE Systems for the production of five M109A7 howitzers and two M992A3 carrier ammunition tracked vehicles in August 2009. The seven PIM prototypes were delivered in May 2011.

BAE Systems was awarded a $313m contract modification by the US Army in January 2012 to provide additional support for the engineering, manufacturing and development phase of the PIM programme. The US Department of Defence granted Milestone C approval for the PIM programme in October 2013.

M109A7 artillery system design and features

The PIM modernisation programme includes upgrades to hull, turret, engine and suspension systems to offer increased reliability, survivability and performance over the M109A6 artillery system. The upgraded system is capable of providing consistent fire support in all weather conditions. The PIM cannon is mounted on the chassis structure common to the Bradley tracked fighting vehicle.

The vehicle is controlled by a crew of four and has an overall length of 9.7m, width of 3.9m, height of 3.7m and maximum gross weight of 35,380kg. It features digital backbone architecture and incorporates an on-board digital fire control system to provide fire mission and compute firing data to the M109A7 cannon system. It also consists of a position navigation system and a computer with comprehensive diagnostics programmes.

The new artillery system can select and take up firing positions, and automatically unlock and point its cannon while on the move. The modernisation effort also represents upgrades to space, weight and power-cooling (SWaP-C).

Paladin PIM armament

The Paladin M109A7 artillery system is armed with a 155mm M284 cannon with a M182A1 gun mount and an automated loader. The 155mm artillery system can fire at a sustained rate of one round a minute whereas the maximum rate of fire is four rounds a minute. The system has a range of 22km with standard projectiles and 30km with rocket-assisted projectiles.

The self-propelled howitzer can also be equipped with fire precision munitions, including the Excalibur and the precision guidance kit.

"The self-propelled howitzer can also be equipped with fire precision munitions including the Excalibur and the precision guidance kit."

Protection features of Paladin PIM

The Paladin M109A7 artillery system is equipped with shoot-and-scoot capability to offer protection for the crew against counter battery fire. It is also fitted with an automatic fire extinguishing system (AFES), gunner protection kit (GPK) and an enhanced applied armour.

Propulsion and performance

The Paladin PIM vehicle is powered by a 600hp engine. The propulsion system also consists of electric elevation and traverse drives, an electric rammer, L3 HMPT-500 automatic transmission, and an on-board power system with a generating capacity of 70kW at a rate of 600V DC / 28V DC.

The vehicle has a fuel storage capacity of 545l and ground clearance of 0.4m. It can ford at a maximum depth of 1.0m and cross trenches of 1.8m depth. The gradient and side slopes of the vehicle are 60% and 40% respectively, while the speed on road is 61km/h and cruising range is 322km.

Defence project