Simjock came up with a good point......the fact that aircraft seem to be engineered so that a simple broken button results in a whole new EXPENSIVE item, such as FCU as he stated. Another on the airbus is the ice detector light, which fails quite a lot. Apparently the whole screen has to be practically removed so an engineer told me the other week - a real long and arduous task I'm sure. Obvious answer is leave it after it's broke, and fall back on the good old torch to check for ice at night........
