Practice and Inert Apers Mines

a. General. Practice mines have the same features and weight a the service mines they represent. Practice mines usually contain small quantities of explosive (usually black powder) or smoke or noisemaking composition to simulate functioning of a service mine. Inert mines, which are completely inert, are used for practice In handling.

Land Mine Types
Figure 7-1. Representative types of land mines. Change 5 7-2
Figure 7-2. APERS mine ready for firing: A—by observer B—by enemy

b. Fuzes. Practice mines are provided with practice fuzes having firing mechanisms fitted with primers and igniters. When initiated, the firing mechanism ignites the spotting or propelling charge in the mine. Inert mines are provided with completely inert fuzes.

c. Types. Practice APERS mines simulate the basic type:

(1) Bounding-fragmentation type. This practice mine (fig. 7-3) has no projectile. Otherwise, it has the same metal parts as the corresponding service mine. Actuation of the firing mechanism causes the firing pin to hit the primer. The primer ignites a delay train which burns for 4 or 5 seconds before initiating the igniter. When the igniter charge ignites the smoke pellets and expels the mine cap, yellow smoke is emitted from the igniter tube and smoke pellets.

Figure 7-3. Typical bounding-type practice APERS

mine.

(3) Nonmetallic practice APERS mine, N17. This mine (fig7-3.1)is the practice version of mine, antipersonnel, NM, M14, with integral fuze. The Nl7 like the N14, is detectable by metallic-type mine detectors, and is not reusable. Unlike the H14, the M17 provides a 1 to 2 second delay between activation and functioning. The mine cannot cause injury to the person initiating it or personnel in the immediate vicinity. To provide the visible and audible signal required for the practice mine, the N17 contains an expelling charge, a smoke charge and two small firecrackers. The expelling charge blows the fuze portion of the mine and the two firecrackers out of the ground. The firecrackers function either in the air or on top of the ground. The smoke charge stays in the ground and burns for approximately 5 seconds, causing a smoke cloud to issue from the hole made by the expelled fuze. The N17 practice mine has the following characteristics: Force of 20 to 35 pounds applied to the pressure plate of the armed mine will cause the mine to function. A man's weight is sufficient to activate a mine M17 buried to a depth of 1/2inch or less. The N17 is designed to withstand exposure to alternate freezin8 and thawing periods. Until the mine is armed, the safety clip prevents downward motion of the pressure plate. If the safety clip is removed, the nine remains safe until the pressure plate is turned from the safe (S) position to the armed (A) position (fig.7-3.1). This motion disengages the key lock from the lock ring and turns the pressure plate clear of the spider, permitting downward motion of the pressure plate. Any weight on the pressure plate will then be transmitted to the firing pin spring assembly. If a weight of 20 to 35 pounds is so applied, the belleville spring will snap through center, causing the firing pin to initiate the primer charge. The initiating charge then ignites the fuse delay which burns for I to 2 seconds before initiating the igniter. The igniter

Figure 7-3. Typical bounding-type practice APERS

mine.

initiates the prime charge igniters which in turn initiate the smoke charge and the firecrackers. The igniter TM

9-1300-200 also initiates the expelling charge which blows the fuze assembly out of the ground.

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