DESCRIPTION. The Z69D is an electric aerial burst fuze with a pyrotechnic delay. (See fig. 176.) The body is of aluminum and has a small flange at the top. It has stamped along a  circumferential groove in its wall, the markings: Z 69D cpp 1a Y. Screwed into the base is an aluminum collar which houses the firing device. This latter consists of a brass contact which is insulated from the collar by a molding of plastic. Lying on top of this is the igniter bridge. The ground return from this bridge to the fuze case is made via the projection in the brass washer, the aluminum securing ring, and the collar itself. The cavity surrounding the firing bridge is filled with a quantity of loose black powder and is closed by a thin aluminum disc held by the washer which is retained in position by turning over the end of the collar. The joint is made waterproof by a thin coat of green paint covering this end of the collar. At the other end a thick coat of white sealing compound is applied after the collar has been screwed into the fuze body. (See fig. 176.)

OPERATION. On release from the plane, the igniter bridge fires, igniting the loose black powder, which in turn ignites the delay mixture. On expiration of the burning of the de-lay, the solid black powder pellet and the perforated blue pellet are ignited. These in turn fire the gaine, allowing the container to open.

Figure 176 – 69CII Electrical Aerial Burst Fuze