Having used the HGS in QF 73ngs for some time I can imho give creedance to the impending tail scrape warning which I have seen several times on rotate. We didn't have a tail scrape but it did occur at heavier weights with derated power set. We were told that tail scrapes can cost about 1/2 mill if serious to check. Perhaps the business case was valid after all. Any QF drivers care to comment on similar experiences?