Figure 2-44. PD fuzes for howitzer projectiles.
The M548 MTSQ fuze may be used with a variety of projectiles. It is used when a choice between timed and
superquick action is required.
The M582 MTSQ fuze is designed for use with 105-millimeter HE, HERA, and WP projectiles, as well as with 8-
inch HE projectiles. It provides straight time and superquick action. The settings for this fuze can be seen
through a window on the fuze ogive.
Examples of ET fuzes are shown in Figure 2-46. The M724 ET fuze is used only with base-ejection-type
improved conventional munitions (ICM) projectiles. The time must be set by the loading crew, and, once fired, the
fuze is powered by an internal battery.
The M767 ET fuze is used with HE and bursting-type howitzer projectiles. The fuze time is set by hand, and is
displayed in a liquid-crystal display (LCD) on the fuze ogive. This fuze uses a reserve lithium battery, and arms
itself fully after launch. The M767 fuze may also be set for PD action.
An example of a PRX fuze is shown in Figure 2-47. The M513-series PRX fuzes are designed for use in deep-
cavity 105-millimeter howitzer projectiles. These fuzes function on or near the surface (for proximity) or upon
impact (superquick or delayed), depending on the mode selected.