TM-9-2350-311-10

TM 9-2350-311-10

2-15 MISFIRE PROCEDURES — CONTINUED

2-15.1 General — Continued

b. Definitions

Checkfire. A checkfire is a command normally given by the executive officer, but in an emergency, may

be given by anyone present who observes an unsafe act.

Cold cannon tube. Any cannon tube that has or has not exceeded rates of fire, and that does not cause

water from a wet swab to boil, fry, or steam off when placed just forward of gas check seat.

Hot cannon tube. Any cannon tube that causes water from a wet swab to boil, fry, or steam off when

placed just forward of gas check seat.

Cook-off. A cook-off is the functioning of the propelling charge when initiated by the heat of weapon.

Hangfire. A hangfire is a delay in the functioning of the primer, igniter, or propelling charge. This delay,

though unpredictable, ranges from a fraction of a second to 10 minutes.

Misfire. A misfire exists when the weapon does not fire after an attempt to fire has been made. This

failure may be due to failure of primer, igniter, propelling charge, or firing mechanism assembly to

function wholly or in part. A misfire in itself is not dangerous. However, it cannot be immediately

distinguished from a hangfire.

Removal of the primer in a sticker situation is dangerous as it will be shooting rearward when

released. The expelled primer may cause injury to personnel standing in its path of ricochet.

Sticker. A sticker is a projectile that is lodged in cannon tube after normal functioning of ignition train.

Stickers may occur when firing at charge 2. When stickers occur, gases under high pressure are

retained in chamber.

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