Man that investigating officer is gonna hate life.... It sucks enough when it’s not something important that people will wait on. This email chain is gonna have all sorts of motivated important people wanting to know exactly who to crucify.
There are maintenance procedures that involve actioning the gun in all manners that would if ammunition was present cause a discharge. The idea is not to have ammunition present.
3rd CAB did this with an Apache at KAF in 2013. Guy did everything for the procedure correct.... except physically check the aircraft was clear of ammunition correctly (you have to mark the carrier drive system with a sharpie and watch that mark go by 3 times as you manually advance it from the sideloaded to check the magazine is empty). So rounds he didn’t see when he just glanced at the feed chute between the gun and the aircraft weren’t there, bolt was clear... must be good to go right? Luckily the way they were parked he sent rounds about 3 and a half kilometers out into nowhere. Though he did shoot them over the ammunition handling area in the process which didn’t make the Air Force too happy.
Luckily he was parked far enough back from the hesco barriers in front of him the rounds didn’t smack that 12 feet in front of the aircraft, though at that range they’d probably not have had enough rotation to arm yet.
Oops. An Abrams had an ND in Baghdad in 06. My platoon was coming into the green zone and there was an Abrams parked at the ECP. About a minute later we hear an explosion and thought the ECP just got hit by a VBIED. Then a few seconds later a sheepish voice said on the radio "uhhh... Main gun ND..."
They accidentally fired a 120mm shell across the city.
There was an Apache that launched a Hellfire on the ground.... twice. A model had a weird electrical gremlin that was known but not understood. So when the crew applied APU power the APU came on... missile launches.
It’s programmed with a G-bias climb if it doesn’t see a laser return on the rail, so it did what it’s supposed to climb and then fly to the limit of what it’s rocket motor will give it.