TM 9-2350-256-102-13. OPERATION OF AUXILIARY EQUIPMENT-Continued.(7)Unloading.WARNING·Ensure arming switch is off (lamp not lit) before unloading grenades fromdischarger.·Never place your body in front of dischargers when unloading grenades fromdischarger.(a)Remove grenades from dischargers and storage bins.(b)Return grenades to metal ammunition storage boxes.(c)Replace canvas covers over dischargers.(8)Misfireandduds.(a)Misfire. A misfire is the failure of grenades to be launched from grenade discharger barrels. When amisfire occurs, make two additional attempts to fire the grenade (see para. 2-13c(6)). If the grenadestill remains, attempt to fire the grenade from another grenade discharger barrel. If grenade remains,treat as a dud.(b)Duds. A dud is a grenade that has either failed to be launched from grenade discharger or has beenlaunched but failed to burst. Place dud in an empty ammunition storage box as referenced in TM60E-3-2-3 and dispose of in accordance with local SOP.(9)Ammunition.(a)Description. UKL8A1 RP screening smoke launcher grenades are used with the M239 grenadelauncher. They are filled with a red phosphorus and butyl rubber mix. Each grenade is approximately2.625 in. (58 mm) in diameter, 7.281 in. (185 mm) long, and weighs approximately 1.5 lb (0.68 kg).(b)Function. A grenade is propelled from the discharger barrel when electrical current at the firingcontact ignites the fuze. The fuze ignites the propellant charge and a delay composition and, in-turn,the gunpowder bursting charge. This bursts the rubber case and ignites the red phosphorus/butylrubber composition to produce an immediate smoke cloud.2-170
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