A300
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical; Inflight Event / Encounter Weather / Turbulence
Aircraft Equipment Problem Dissipated; Flight Crew Took Evasive Action; General Declared Emergency
Aircraft; Weather
On arrival descending through approximately 16;000 FT as we entered the clouds we encountered multiple failures. First Officer airspeed indicator decayed to '0' KIAS; ATS lever tripped; yaw damper '2' tripped; engine primary N1 mode failed. All systems reset once we were clear of clouds. We then reentered the clouds and all failures immediately re-appeared. We then requested vectors to remain clear of clouds which we did not receive. Then we declared an emergency in order to remain clear of clouds. On approach after both autopilots were engaged; the Number '2' autopilot failed. We continued the cat II approach with 1 autopilot to an uneventful landing. No assistance was needed on the ground.
Multiple aircraft failures immediately following flying thru cloud with precipitation in it. Lost Number 2 autopilot; ATS; primary engine mode; yaw damper; First Officer's airspeed indicator. Declared emergency to avoid flying into anymore CB clouds and further icing degradation. I suspect failure of pitot heat to defend against icing up First Officer's pitot tube.
A300 flight crew experiences multiple pitot static system failures upon entering clouds during descent; which immediately disappear upon exiting the clouds. When clouds are entered again the scenario repeats. An emergency is declared to remain clear of clouds during vectors for approach.