Had an IRS #1 fault early this morning.
On the previous flight the named IRS was a bit slow during alignment (circa 15sec behind IRS #2, never seen before, IRS`s are coming "on-line" almost simultaneously), then we had a FAULT during alignment next day, we gave it another try, now successful. And then, 1,5hrs into the flt, my EADI and EHSI went blank, A/P off, QRH actions (recovery to ATT mode) were unsuccessful. We switched the IRS instrument transfer switch to Both on R, descended below RVSM (no A/P) and landed at destination.
Next time I`ll be more cautious when IRS will be a bit slow on start-up
Otherwise never had a single significant problem on the lovely Fat Albert
