Does the H10-13.4 work with the Icom IC A14 radio?
Yes, these two items will work together, but you will need to purchase the Icom headset adapter, part # 11-18537, separately to make them work.
Does the David Clark H10-13.4 come standard with Dual GA plugs?
Yes, this headset is equipped with Dual GA plugs.
Can I use this headset (H10-13.4) in my Robinson R44? Should I use any adapters?
This headset has dual GA plugs which are standard in more fixed wing, general aviation aircraft. If your Robinson R44 is equipped with a single U-174 civilian helicopter plug, you would need part # 11-10630 as an adapter.
Does the headset comes with the ear seals, microphone cover etc., listed for purchase in the Accessories? Or are those extra parts?
Yes, the ear seals, headpad and mic muff are included with the headset. The accessories listed are for reference in case you lose them or need extras.