The M109A7 Self-Propelled Howitzer (SPH) and Carrier Ammunition Tracked (CAT) resupply vehicle struggled during official Pentagon testing, and now may not be ready for planned full-rate production in fiscal year 2018.
The M109A7 vehicles are based on a Bradley infantry fighting vehicle chassis, power train, and suspension, with a modified turret and electrical system.
Initial testing in October 2016 found that fumes were released in the SPH cab and testing was suspended, according to the Director of Operational Test and Evaluation's (DOT&E's) 2017 annual report.
Testing also revealed problems with rate of fire, reliability, and failures with the breech (the latter was the most common failure mode).
Want to read more? For analysis on this article and access to all our insight content, please enquire about our subscription options at ihs.com/contact