Originally Posted by
tnuc
Has Anyone bothered to look at or ask why TCM requires a 5 year since overhaul / 4 year since installation calendar time overhaul ?
No, but I would hope it was after rigorous analysis of a large database of collected SDRs and reported failures, which were analysed statistically and an evidence-based figure of 4 years generated. What I suspect though was someone licked their finger, stuck it in the air and said '4 years seems 'bout right'. Wouldn't it be lovely to be proved wrong, and wouldn't the SB doc make much more interesting and useful reading if the supporting data were presented or summarised?