FLC OF MDT ACR ACFT FOUND AN ACCESS DOOR MISSING DURING ACFT POST/PREFLT INSPECTION AFTER LNDG.

Narrative

AFTER LNDG AT CVG I POST-FLT MY ACFT AND DISCOVERED A LARGE HYD SVCING ACCESS DOOR MISSING FROM MY ACFT. EVENTS AND CIRCUMSTANCES LEADING TO THE DISCOVERY FOLLOW: I WORK FOR (ACR TYPE) AIRLINES AND AM DOMICILED IN CINCINNATI; OH. I FLY THE 30 PAX MDT ACFT AS A FO (COPLT). ON THE DAY OF THE INCIDENT (APR/SUN/92); I ARRIVED AT FLT OPS AT APPROX PM HRS LCL TO PREPARE FOR A 2 DAY TRIP TO VARIOUS CITIES. DURING FLT PREPARATION; I READ THE COMPANY OPS NOTICE; 1 OF WHICH DESCRIBED AN INCIDENT IN WHICH A HYD ACCESS DOOR HAD FALLEN OFF AN ACFT IN FLT AND CAUTIONING PLTS TO CAREFULLY PRE/POST-FLT THIS DOOR. WHILE PREFLTING MY ACFT; I SPECIFICALLY CHKED BOTH THE L AND R DOORS TO ENSURE THEY WERE PROPERLY ATTACHED AND LATCHED. THEY WERE BOTH THERE. WE FLEW AN UNEVENTFUL REVENUE FLT TO TRI- CITIES ARPT IN BRISTOL; TN; ENCOUNTERING NO UNUSUAL ACFT NOISES OR HANDLING. AFTER LNDG AT TRI-CITIES; THE CAPT POST/PREFLTED THE ACFT FOR THE RETURN TRIP TO CINCINNATI; AGAIN TAKING CARE TO CHK THE HYD SVC DOORS. AGAIN; THEY WERE BOTH THERE. WE DEPARTED TRI-CITIES AT APPROX PM; ENCOUNTERING LIGHT TURB DURING CLBOUT TO ABOUT 8000-10000 FT. THE FLT WAS ROUTINE; AND NOTHING UNUSUAL WAS NOTICED REGARDING THE ACFT HANDLING. UPON LNDG AND POST-FLT INSPECTION AT CINCINNATI; I DISCOVERED THE L HYD SVC DOOR WAS MISSING. THE HINGE WAS TORN; INDICATING THAT THE DOOR HAD DEPARTED THE ACFT SOMETIME DURING THE FLT. AT PRESENT; THE DOOR HAS NOT BEEN RECOVERED. ALL REST AND CURRENCY REQUIREMENTS HAD BEEN MET. BOTH MYSELF AND MY CAPT WERE ALERT AND WELL RESTED.