@Mee3 yes that is exactly our expectation and what we are prepared for and will take your advice onboard. What is more critical is how we modify the aircraft and how the 'role equipment' will link to the antennas for the broadcast and what, if any, EMC/ELA considerations we need to make....actually the manufacturer has a very good SB that basically says, more than 25A electrical draw, 30W EM emission or HF aerial then you need to do an EMC assessment - this doesn't need to be part of the mod just needs to be carried out separately if you can't meet that criteria above. At this stage its looking like a minor mod as no significant effects on W & B, electrical load, structure etc...