CONSTRUCTION. The MK 250 LK is constructed in two halves, which open along the longitudinal axis and which is hinged at the tail.

The nose and the tail cone is secured inside the body by spot welds.

On the lower half of the body, a strengthening rib is welded to the bottom longi-tudinally. Seven locating plates are welded inside the joining edges of the two halves to insure alinement.

The fuze poccket is welded to the upper half of the container. The lower end of the fuze pocket in increased in wall thickness. Inserted into the lower part of the fuze pocket, and secured by a 5/32-inch steel shear pin, is the steel anvil. Around the base of the anvil is a collar upon which the base of the fuze pocket is seated. A steel tube, welded to the underside of the anvil, is internally threaded to receive the container locking bolt. A steel collar is inserted in the fuze pocket and rests on the top of the anvil, and when assembled the fuze gaine locates in-side this collar. (See fig. 109.)

The container is held closed by the locking bolt. Locking bolt is held in the tube which is welded to the anvil. The anvil is held by the shear pin. When container is dropped, the fuze initiates the burster charge. The explosion forces the anvil down. The shear wire is broken. The locking bolt is then forced out and container opens.

Four tail fins are spot welded to the cone, the two on the upper half being slot-ted to facilitate loading on the bomb rack. An ordinary strengthening strut is rive-ted between the pairs of fins on each half of the tail cone.

The Mk 250 BK differs from the Mk 250 LK in that no cutaway portion exists in the upper tail fins and that it contains a subsidiary container for three SD 2-kg H.E. bombs similar but of approximately half the length of that described under the Mk 500 Boden 6 SD. This container is secured to the bottom half of the larger con-tainer by means of a double wire cable secured around the base of the suspens-ion strut. Large container operates the same as Mk 250 LK. The SD 2 container falls until it reaches the end of its cable. The resultant jerk causes locking wire to break and it then opens.

SUSPENSION. Horizontal. The suspension lug threads into a suspension block welded to a suspension strut which itself is welded to the bottom of the lower half of the container. A rectangular plate is welded over the top suspension block and bears on the underside of the upper half when the container is closed.

COLOR AND MARKINGS. Both containers are khaki colored over-all, but the body markings differ.

Mk 250 LK

41 Weiss

(89) BOF

Mk 250 BK

3 SD 2

A red bar 8 inches long and 1 inch wide is stenciled immediately above the nose weld.

Figure 109 – Mark 250 LK Container