Abstract: A security drawer assembly is provided for a standard airline service cart having opposite cart sidewalls defining a storage space therebetween and a plurality of horizontal runners mounted on the sidewalls inside the storage space. The security drawer assembly generally comprises a sleeve and drawer slidably mounted within the sleeve. The sleeve has opposing sidewalls defining a sleeve passage open at both ends. Each of the sleeve sidewalls include a horizontal flange for engaging the runners of the service cart. The sleeve is retained within the cart by stop blocks connected to the sleeve sidewalls which engage the ends of the cart runners. The stop blocks are connected to the sleeve by fasteners which are not accessible for removal when the drawer is closed and locked. The drawer is preferably constructed so as to be slidable in either direction such that it has a closed position and two open positions, one corresponding to each of the two open sleeve ends.