Mk 25 Marine Location Marker The Mk 25 marine location marker (fig. 8-24) is launched from aircraft or surface craft. It is primarily launched from aircraft to provide day or night reference points in marking the course of enemy submarines. It is suitable for any type of sea-surface reference-point marking that calls for both smoke and flame for 10 to 20 minutes. Mk 58 Mod 1 Marine Location Marker The Mk 58 Mod 1 marine location marker (fig. 8-25) is used for long burning, smoke and flame reference-point marking on the ocean's surface. In addition to being used for antisubmarine warfare, it is also used for search and rescue operations. It is also used for man-overboard markings and to provide a target for practice bombing at sea. This marker produces a yellow flame and white smoke for 40 to 60 minutes. The marker is visible from an aircraft for at least 3 miles under normal operating conditions. Q8-21. Define pyrotechnics as used in the military. Q8-22. What are the two hand-held signaling devices used by downed aircrew and personnel in distress over land or at sea? Q8-23. The Mk 25 Mod 0 aircraft parachute flare is used for what purpose? Q8-24. The Mk 58 Mod 1 Marine location marker is used for what purpose? CARTRIDGES AND CARTRIDGE-ACTUATED DEVICES (CADs) LEARNING OBJECTIVE: Identify the types, uses, and basic characteristics of cartridges  and  cartridge-activated  de- vices. With the advent of the high-performance jet aircraft, aviation relies more and more on CADs. CADs are small explosive-filled cartridges used to fire other explosives or release mechanisms. CADs provide high reliability  and  easy  maintenance.  The  cartridges undergo rigid quality control throughout design and manufacture. Their actual performance is dependable only when they have been properly handled and installed. In a personnel escape system, the CAD must work perfectly the first time. Malfunction of a device or failure to fire when needed usually results in injury or death to the pilot and/or crew members. Escape operations performed by cartridges and CADs are canopy removal, seat ejection, streaming of ejection seat drogue chutes, and parachute opening. It is not possible to discuss all the cartridges and CADs in this TRAMAN. Therefore, a few representa- tive cartridge systems are briefly discussed. PERSONNEL ESCAPE DEVICE CARTRIDGES High-speed aircraft have many designs, special control features, and space limitations. As a result, a sequence of emergency operations must be carried out before it is possible for pilot and/or crew members to escape. CADs allow several operations to be performed concurrently (at the same time), or in rapid sequence, to 8-22 VALVE PLUG STARTER MIX OUTER TUBE CHIMNEY PYROTECHNIC COMPOSITION SEA WATER ACTIVATED BATTERY BASE COVER G-RING RETAINER RING ELECTRIC SQUIB 3.080 DIA. MAX. VIEW A ARROW BASE PLUG NOTCH 18.54 MAX O 2.976 DIA. MAX. ANF0824 360 CRIMP A Figure 8-24.—Mk 25 marine location marker.