airBaltic 737CL FMC occurences - any ideas why?
Had the pleasure of departing from BRU the other week, in one of BT's classic(!) 737s. Already before departure, the "FMC FAIL" occured several times, also blanking the N1 computation for takeoff thrust. Once airborne, the "FMC FAIL" occured again. Shortly thereafter, FD disappeared and AP disconnected. FD would not re-engage for several minutes, neither would AP. FD/AP + autothrottle had initially been in HDG SEL and N1 mode.
Any ideas why this happens? Colleaguespeak is that it almost ALWAYS happens out of/in to Brussels, Milan, Zurich, Rome, ... whereas it never happens elsewhere? Does it happen with other airline's 737CL as well? Our FMS version the last time I experienced this was U5.0, but I have also seen "FMC FAIL" during vectoring for approach in BRU with U8.5. Any comments are welcome!