A BEECH 1900D WAS DISPATCHED WITHOUT THE ACFT FLT MANUAL AND THE POM BEING BOARDED.

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ON THE EVENING OF APR/XA/98; I WAS CALLED INTO WORK AT APPROX XA15 (CENTRAL TIME) TO SIGN A REQUIRED INSPECTION ITEM ON ACFT XYZ. THE ACFT FLT MANUAL AND POM WHICH WERE REMOVED FROM THE ACFT EARLIER DUE TO MAINT BEING PERFORMED ON THE ACFT WERE ON A TABLE INSIDE THE N SIDE OF THE HANGAR ADJACENT TO WHERE THE ACFT WAS. THE PLT PLACED HIS HAND ON THE 2 MANUALS ON THE TABLE NOTING THAT THEY WERE OR HAD BEEN LOOKED AT. AT THE POINT WHERE I REVIEWED THE ACFT PAPERWORK AND THEN SIGNED THE ACFT MAINT RELEASE; THE PLT WAS BTWN MYSELF AND THE MANUALS. I THEN GOT UP AND PROCEEDED TO THE INSPECTOR'S OFFICE WHERE I PUT THE PAPERWORK ON A DESK INSIDE THE OFFICE FOR TURN-IN TO THE RECORDS DEPT IN THE MORNING. AFTER A FEW MINS I WENT BACK OUT INTO THE HANGAR WHERE I SAW THE CABIN DOOR BEING CLOSED AND LATCHED BY ONE OF THE CREW FROM THE INSIDE. I RECALL LOOKING OVER AT THE TABLE AND RECALL SEEING THE MANUALS NOT THERE ANYMORE SUGGESTING THE CREW HAD TAKEN THEM WITH THEM. JUST AFTER XE30 I NOTICED THEM ON THE CHAIR IN FRONT OF THE TABLE AND FOUND THEM TO BELONG TO ACFT XYZ WHICH HAD DEPARTED ZZZ EARLIER. I BROUGHT IT TO THE ATTN OF THE LEAD (YYY) AND WHEN OPS CALLED APPROX XI00 IT WAS DISCUSSED THAT THE ACFT WAS MISSING THE MANUALS. THE NEW CREW LATER FERRIED THE ACFT BACK FROM BBB TO ZZZ; TO REPLACE THE MANUALS. THIS OVERSIGHT WILL BE AVOIDED IN THE FUTURE BY INCLUDING A CHK FOR THESE MANUALS IN THE ACFT INSPECTION FORMS PROVIDING FOR POSITIVE KNOWLEDGE THAT REQUIRED ACFT MANUALS ARE INDEED IN THE ACFT.