FLC OF AN EMB145 DECLARED AN EMER AND DIVERTED TO LAND WHILE CRUISING AT FL240 WHEN THE #1 ENG WAS AUTOMATICALLY SHUT DOWN BY FULL AUTH DIGITAL ENG CTL DUE TO ENG CTL WARNING LIGHTS CAME ON AFTER RESETTING THE FULL AUTH DIGITAL ENG CTL CALLED FOR IN THE QRH (QUICK REF HANDBOOK).

Narrative

WE WERE IN CRUISE FLT AT FL240 ENRTE FROM CLEVELAND HOPKINS INTL TO NASHVILLE IN IMC CONDITIONS (LIGHT RAIN; IN CLOUDS; LIGHT TURB) WHEN '#1 ENG CTL A' AND 'ENG #1 CTL B' CAUTION MESSAGES ILLUMINATED ON EICAS. WE COMPLETED THE APPROPRIATE 'ENG CTL FAIL' QRH THAT CALLED FOR RESETTING THE FULL AUTH DIGITAL ENG CTLS; AND WHEN THIS HAD NO IMPACT; PROCEEDED TO NEXT STEP THAT CALLED FOR ALTERNATING THE FULL AUTH DIGITAL ENG CTL ON THE AFFECTED ENG. SHORTLY UPON ALTERNATING THE FULL AUTH DIGITAL ENG CTL; 'ENG #1 LOW N1' MASTER WARNING ILLUMINATED AND THE #1 ENG SHUT ITSELF DOWN. APPROPRIATE QRH FOR 'PRECAUTIONARY ENG SHUTDOWN' WAS COMPLETED; EMER DECLARED; FLT ATTENDANT NOTIFIED AND THE COMPANY ADVISED. WE WERE THEN VECTORED FOR AN ILS RWY 17R APCH TO SDF. ON A 5 MI FINAL; 'GENERATOR BEARING #1 FAIL' ADVISORY MESSAGE ILLUMINATED. AFTER AN UNEVENTFUL LNDG; 'GENERATOR BEARING #3 FAIL' ILLUMINATED. ACFT WAS TAXIED TO THE GATE AND DEPLANED. CALLBACK CONVERSATION WITH RPTR ON ACN 404407 REVEALED THE FOLLOWING INFO: RPTR STATED THE ENG WAS AN ALLISON MODEL A3007A (NO DASH #); AND DID HAVE INSTALLED THE 4TH FULL AUTH DIGITAL ENG CTL COMPUTER CHANGE WHICH WAS APPROVED BY THE FAA. HOWEVER; THE LATEST ALERT BULLETIN WHICH ADDED AN ADDITIONAL STARTING CHKLIST PROC WAS NOT YET UPDATED TO THEIR ACFT'S CHKLIST. THIS ALLOWED THE PRE-START PROC TO BE DOUBLE-CHKED SINCE IT TESTED TO SEE THAT EACH OF THE 2 FULL AUTH DIGITAL ENG CTL SYS WERE TURNED ON. WHEN CHKED; IF THE ENG AFTER START KEPT RUNNING; IT PROVED THAT BOTH WERE TURNED ON; WHICH WAS THE CAUSE OF THE ENG COMPLETE SHUTDOWN WHEN ATTEMPTING TO RESET THE ENG FULL AUTH DIGITAL ENG CTL PROB INFLT; SINCE THE FO DID NOT DO THE PRESCRIBED TEST BEFORE STARTING ENGS AND THE CHKLIST DID NOT CONTAIN THE NEW PROC TO CHK AFTER ENGS WERE STARTED ON THE GND. AS FAR AS THE CAPT RPTR KNOWS; ALL THE ENG MODELS HAVE THE SAME FULL AUTH DIGITAL ENG CTL; AS THE FULL AUTH DIGITAL ENG CTL SYS IS THE SAME. THERE ARE TWO FOR EACH ENG FOR A TOTAL 4 AND DO GIVE SOME INFO FROM THE OTHER ENG PAIR; IE; IF 1 ENG IS SHUT DOWN DUE TO PRECAUTIONARY PARAMETERS NOT WITHIN NORMAL LIMITS; THE OTHER ENG FULL AUTH DIGITAL ENG CTL RECORDS THIS AND THEN HOLDS THE REMAINING ENG TO A HIGHER STANDARD SO IT WILL NOT SHUT DOWN SO EASILY. THE RPTR FURTHER STATED THAT HE BELIEVES THAT THE FAA APPROVED THIS 4TH CHANGE TOO HASTILY SINCE THE ADDITIONAL GND CHK IS VITAL AND SHOULD BE INCORPORATED ON THE CHKLIST BEFORE OPERATING THE ACFT. THE ALLISON MANUFACTURER HAD 2 REPRESENTATIVES AT HIS ACFT WITHIN 2 HRS AFTER THIS INCIDENT. HE BELIEVES THAT THE FAA AND MANUFACTURER ARE WELL CONCERNED. THERE HAVE BEEN 28 ENG REPLACEMENTS LAST YR ON THIS ACFT WHICH DID NOT RELATE TO THIS PROB. IT WAS BECAUSE OF FAULTY MAIN BEARINGS CAUSING EXCESSIVE OIL PRESSURE. HE FURTHER STATED THAT THE GENERATOR BEARINGS WERE NOT A REAL PROB SINCE THEY WERE FOR 20 HR MAINT ALERT.