The armoured cab designed by Tencate is fitted with Jankel BLASTech seating, which helps reduce the impact of a blast to increase the survivability of occupants. The M917A3 HDTs will support the US Joint Forces in operations such as mobility, survivability, counter mobility, and sustainment. The hub gives the driver control over the tailgate, tarp, hoist, thermostatic body heater system, material control system, and inclinometer. The vehicle is fitted with a control module with a touch screen display that can provide information related to functionality and safety to the operator. Mack’s Cornerstone chassis allows the tuck to transform into multi-mission platform to serve the military’s logistical and tactical support needs. M917A3 offers a payload capacity of up to 27t. The heated steel dump body has the capacity to carry 13.76m³ of dump. The cab can accommodate two personnel, including a driver. In the 8×8-wheel configuration, the truck has a gross vehicle weight of 42.9t. The truck can also be used as a radar carrier, tanker, wrecker, troop carrier, and heavy equipment transport vehicle. The HDT provides the capability to swap the standard cab with the drop-in armoured cab to meet mission needs. The truck is equipped with a force protection capability and comes with a standard cab and an optional armoured cab, which is designed to meet the blast requirements of the US Army. The enhancements made to the Granite model include all-wheel drive, heavy-duty rear axles, and increased ride height suspension. The HDT is based on Mack Defense’s Granite axle-forward construction grade chassis and includes modifications to provide improved payload, mobility, and survivability in hostile environments. The first production vehicles were delivered to the US Army and the US Army Reserve in September 2021. The company established a dedicated production line for the vehicle with an investment of $6.5m. Mack Defense commenced the production of the HDTs at the Mack Experience Center (MEC) in Allentown, Pennsylvania, in the first quarter of 2021. The HDTs will serve both the US Army and the US Army Reserve. The company received an order from the US Army to deliver 99 M917A3 non-armoured HDTs in March 2021. Mack Defense’s M917A3 HDT was preferred over the solution proposed by Navistar Defense. The next-generation armoured trucks will be delivered to US Army units across the world by May 2025. The $296m contract involves the supply of 683 armour-capable or armoured HDTs to the US Army to enhance operational effectiveness and readiness. Mack Defense received a contract from the US Army to deliver M917A3 HDTs in May 2018. The trucks also underwent live fire testing to evaluate the survivability of the occupants. The performance and durability of vehicles were tested. The vehicles participated in a 40-week PVT phase at the US Army’s Aberdeen Test Center, following the delivery. Mack Defense delivered six M917A3 trucks in armoured configuration to the US Army in September 2020. The company tested the HDT in areas such as trench crossing, vertical step, and side slope during the test production and competition phases. Initial testing excluded the testing of armour capability. The testing, which began in the second half of 2019, was intended to evaluate various performance metrics, including payload, mobility, and safety. The first five non-armoured trucks were formally handed over to the US Army in June 2019 to undergo a 40-week durability testing at the Aberdeen Test Center in Maryland.
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