What was found
DURING FERRY FLT, RECEIVED NR 1 & 2 AIRSPEED, ALTITUDE FAIL MESSAGE. NR 1 HORIZ SITUATION INDICATOR WAS UP TO 45 FT OFF FROM STANDBY COMPASS. CREW ALSO RECEIVED GROUND PROXIMITY WARNING WITH GEAR WARNING HORN, FLAP WARNING ACTIVE. ALTITUDE INDICATIONS SHOWED NOSE LOW LT TURN WHEN ACTUALLY AC LEVEL IN RT TURN. EMERGENCY DECLARED, AC LANDED SAFELY. MAINT FOUND DAMAGED PITOT SYS FROM BIRDSTRIKE HAD NOT BEEN DEACTIVATED PROPERLY FOR FERRY FLT CAUSING STATIC SYSTEM TO BE PRESSURIZED. MAINT REMOVED & REPLACED PITOT/STATIC PROBE. OPS AND LEAK CHECKS GOOD. AC FERRIED, FOR COMPLETION TO REPAIR DAMAGE TO FUSELAGE FROM BIRDSTRIKE.