AN ECLIPSE 500 CAPT RPTED MULTIPLE AIRSPEED-RELATED PROBLEMS SHORTLY AFTER TAKEOFF. HE RETURNED TO LAND AT HIS DEP ARPT.

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UPON GEAR RETRACTION; AFTER TAKEOFF; RECEIVED FULL STALL WARNING. CAS MESSAGES -- AIRSPD DISAGREE -- STICK PUSHER FAIL. RED AIRSPD DIGITS ON FO PFD ALONG WITH STALL TAPE AT 120 KTS. THE DECISION WAS MADE TO RETURN FOR LNDG ON THE DEP RWY. ALT AND VIS WAS SUFFICIENT AND TWR WAS ADVISED.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED HE HAS HAD THIS TYPE OF FAILURE SEVERAL TIMES IN THE LAST FEW MONTHS IN THE EA50; AND IT HAS BEEN TRACED TO MOISTURE IN THE STATIC SYSTEM. THE PROBLEM NORMALLY ARISES WHEN THE ACFT IS ON THE RAMP DURING RAINSTORMS; BUT CAN ALSO OCCUR WHEN FLOWN IN RAIN. RPTR STATED IT CAN POSE A COMPLEX AND CHALLENGING SCENARIO TO THE FLT CREW WHEN THEY ARE CONFRONTED WITH A NUMBER OF FLAGS AND WARNINGS; INCLUDING STALL INDICATIONS JUST AFTER TAKEOFF IN IFR CONDITIONS. RPTR STATED THERE IS AN A.D. OUT ON THE STATIC SYSTEM THAT THEY HAVE COMPLIED WITH ; BUT THEY CONTINUE TO HAVE PROBLEMS WITH THE MOISTURE ISSUE. THE RPTR BELIEVES THE LOCATION OF THE STATIC PORTS ABOVE THE MIDLINE OF THE FUSELAGE CONTRIBUTES TO THE PROBLEM.