Quoted: The weapon closer to the outboard tip of the stub wing... isn't that an AH-64 Apache 30mm chaingun cannon mounted sideways?
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Yup, it's the same gun as the AH-64.
The mini-gun mounts on all Army Blackhawks are capable of either flex firing through manual aiming (i.e. door gunner) or can be locked in the forward facing position and fired by the pilot. So any Blackhawk with a mini-gun can do either strafing or flex suppression. Just depends on what you need to do.
The original DAP used the ESSS (wing stubs) with four hardpoints. The 30mm were inboard and the outboard stations were either rockets or hellfires, or a mix. The mount you see there in the pic is an improved one. The original (ESSS) couldn't take the recoil of the 30mm. It transmitted it directly to the airframe, which caused problems.
On the UH-60 there's two beams that run down the length of the cabin in the roof. The ESSS mounts on side stubs that connect to the beams. Originally the ESSS was simply for fuel tanks, rockets, missles, etc, that were all releatively heavy, but didn't produce recoil. All they needed to do was to be strong enough to take the G's of maneuvering with the weight out on the stub wings. They weren't designed for the 30mm, and the recoil was too much. It ended up cracking both the beams on one of the test aircraft. I don't mean hairline cracks. I mean actual separation of the beams into halves (i.e the aircraft's back broke). With all the weight of the crap on the ship, the broken and separated parts of the beams were actually several inches away from each other.
As the aircraft was stripped down and the airframe unloaded, the beams crept back together until finally the airframe was straightend out, the beams connected and then they were welded. The aircraft was returned to service.