XN 246
Coff I do not really recall any major issues with the MK111 other than after CFS came on the scene and decided that they needed an 'intercom' with expensive headsets for proper communication.
On the basis that the average airborne time was 2-4 minutes depending on the exercise i am at a loss to know what sort of 'conversation' was to be undertaken. I think the 'Mod' cost more than the original airframe and needless to say was a complete waste of time,but at least looked better than those silly plastic goggles that came later,and of course were never designed for aviation use only for grinding. The final straw of course was when the NAFFI closed.