Well Aside the VNAV that disconnect the autorottle andmake a mess doesnt level at ALT retriction and dont follow any profile, but this can be et or now using LVLchange.

Yesterday i left rom LIMC to EFHK (helsinki) When i wa descending i had a TAT of 12 degrees all cloudy and anti ice were on auto.

I didnt suppose any ice but actually i saw the airspeed tape arriving to 30 knots and engines spooled up at max power so since the GS was around 480 knots i piloted by hand. I moved the anti ices on on position and after 30 minutes the problems were not solved always the spped at 30 no glide slope no loc all red. so i had to do all by hand.

IN case of ice what procedure hould i follow to have the ias working again?

Thanks
Alfredo