A DORNIER 328-300 IN CLB AT 5000 FT RPTED TO ATC OF THE NECESSITY TO RETURN TO PIT DUE TO EICAS ENG WARNINGS AND PRIMARY FLT DISPLAY FAILURES.

Narrative

THE DO328-300 JET COMMONLY DISPLAYS NUMEROUS EICAS MESSAGES UPON INITIAL START UP AFTER SITTING OVERNIGHT. TO CORRECT THE EICAS DISPLAYS ONE HAS TO SHUT DOWN THE ENTIRE ACFT (REMOVING ALL PWR TO ACFT). THIS RESETS ALL THE PARAMETERS; THEN THE ACFT IS RESTARTED. 99% OF THE TIME ALL ABNORMAL EICAS MESSAGES ARE CORRECTED. ON THE INITIAL START UP THAT DAY WE HAD AN AMBER L AND R FADEC FAULT. WE SHUT DOWN THE ACFT AND CONSULTED MAINT. WE RESTARTED AND THE MESSAGE CLRED. THE FIRST LEG THAT DAY WAS UNEVENTFUL. ON OUR SECOND LEG ON INITIAL CLBOUT WE HAD A L AND R FADEC FAULT. BOTH ENGS WERE PERFORMING NORMALLY. WE WERE HANDED OFF TO NEXT CTLR AND TOLD TO CLB TO 10000 FT. ON OUR CLB BTWN 5000-10000 FT I NOTICED BOTH PRIMARY AIRSPD INDICATORS INDICATING 30 KTS (LOWEST VALUE SHOWN) AND THE STANDBY AIRSPD INDICATOR READING ZERO. BOTH PRIMARY ALTIMETERS WERE RECYCLING; AS IF TRYING TO RESET. PROBE HEAT WAS ON OTHERWISE ACAS MESSAGE IS SHOWN WITH WT OFF WHEELS. WE NOTIFIED ATC AND REQUESTED TO RETURN TO PIT. IN THE TURN WE NOTICED THAT THE ALT INDICATORS DISPLAYED BANK ONLY (NO PITCH). NO FLAGS WERE NOTICED ON EITHER PRIMARY FLT DISPLAYS. THE CAPT HAD TO FLY OFF THE STANDBY ATTITUDE INDICATOR AND HSI ON PRIMARY FLT DISPLAY. ONCE WE DSNDED BELOW THE CLOUDS ALL INSTS CAME BACK TO LIFE. WE MADE A NORMAL LNDG. MAINT INSPECTED THE ACFT FOR 90 MINS AND FOUND NOTHING WRONG. THE NEXT DAY WE FERRIED THE ACFT BACK TO MKE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A DORNIER 328-300 WITH 2 P&W 306B ENGS. THE RPTR SAID AFTER LNDG MAINT WORKED ON THE AIRPLANE FOR 90 MINS BUT COULD FIND NOTHING WRONG. THE RPTR SAID NO FAULT LIGHTS WERE ILLUMINATED ON THE ELECTRONIC FLT DISPLAY OR ENG FADEC BOXES. THE RPTR STATED THE ONLY CONCLUSION MAINT ARRIVED AT WAS POSSIBLY PITOT TUBE ICING. THE RPTR SAID THE CREW DISMISSED THIS IDEA AND ADVISED THE CHIEF PLT THAT THIS WAS NOT THE PROB. THE RPTR STATED THE ACFT WAS MAINT FERRIED THE NEXT DAY AND OPERATED NORMALLY. THE RPTR SAID THE COMPANY HAS INTERVIEWED THE CAPT AND THE RPTR SEVERAL TIMES ON OUR ACTIONS DURING THIS INCIDENT.