Genghis - did they ever mod the capton wiring? that stuff was an absolute nightmare for the Engineers.
Was the Tucano Capton wired? I can't recall ever hearing mention of it.
Incidentally the Tucano is also unpressurised with a helmet/mask system. My very vague memory thinks that on 100% O2 you had about 2 hours, but I could be miles out.
G