A3. The two types of impact firing fuzes are the point detonating and base detonating types. A4. Upon  arming,  the  mechanical  timer  starts, and after a set time, the mechanical time fuze initiates the firing train. A5. In acceleration-deceleration fuzes, deceleration causes the fuze to function. A6. Proximity  fuzes  sense,  usually  by  electronic means, the presence and distance of a target. AIRCRAFT ROCKET LAUNCHERS LEARNING    OBJECTIVE: Recognize the shipping    configuration    for    aircraft    rocket launchers and identify common aircraft rocket launcher components. Aircraft rocket launchers (pods) carry and provide a  platform  to  fire  rockets.  Launcher  design  permits multiple   loading   and   launching   of   2.75-inch   and 5.0-inch rockets. Rocket pods let rocket motors (and, in some cases, completely assembled rounds) stay in the same    container    from    their    manufacture,    through stowage, to their final firing. Aircraft  rocket  launchers  are  classified  as  either 2.75-inch or 5.0-inch. They may be further classified as either reusable or nonreusable. Launcher tubes that are constructed  of  metal  are  considered  reusable  and  are usually returned for reloading. Under certain conditions,   they   may   be   jettisoned   at   the   pilot's discretion. The 2.75-inch rocket launchers currently in use are the LAU-61C/A and LAU-68D/A. Characteristics and specifications for these launchers are listed in table 2-4. For   detailed   information   about   the   LAU-61   and LAU-68   series   launchers,   refer   to   Aircraft   Rocket Systems 2.75-inch and 5.0-inch NAVAIR 11-75A-92. The 5.0-inch rocket launchers are the LAU-10B/A, LAU-10C/A, and the LAU-10D/A. Characteristics and specifications for these launchers are listed in table 2-5. For    detailed    information    on    the    LAU-10    series launchers, you should refer to Aircraft Rocket Systems 2.75-inch and 5.0-inch NAVAIR 11-75A-92. SHIPPING CONFIGURATION The rocket launcher-shipping configuration shown in   figure   2-16   is   typical   of   all   launcher-shipping configurations, except for the RF barriers. Center Section The    launcher    center    section    is    a    cylindrical construction  of  4,  7,  or  19  tubes  held  together  by  a supporting   framework,   and   it   is   covered   with   an aluminum skin. The center section houses or supports all other components of the launcher. 2-14 LAUNCHER TYPE NO. OF TUBES TUBE MATERIAL REUSABLE METHOD  OF FIRING LAU-61C/A LAU-68D/A 19 7 Alum. Alum. Yes Yes Ripple or Single Ripple or Single Table 2-4.—2.75-Inch Rocket Launchers LAUNCHER TYPE NO. OF TUBES TUBE MATERIAL REUSABLE METHOD  OF FIRING LAU-10B/A LAU-10C/A LAU-10D/A 4 4 4 Alum. Alum. Alum. Yes Yes Yes Ripple or Single Ripple or Single Ripple or Single Table 2-5.—5.0-Inch Rocket Launchers