Q2. At  what  point  does  the  impact-firing  fuze function? Q3. List the two types of impact firing fuzes. Q4. At what point does the mechanical time fuze initiate the firing train? Q5. In acceleration-deceleration fuzes, what force causes the fuze to function? Q6. Name    the    fuze    that    senses,    usually    by electronic  means,  the  presence  and  distance of a target. SERVICE ROCKET ASSEMBLIES Airborne  rockets,  consisting  of  fuzes,  warheads, and  motors,  are  combined  and  assembled  in  various configurations  to  meet  specific  tactical  requirements. For  example,  a  rocket  assembly  that  consists  of  a fragmentation warhead armed with a proximity fuze is entirely unsuitable for use against an armored tank or bunker. Likewise, the GP warhead fuzed only with the Mk   191   base   fuze   is   relatively   ineffective   against personnel or unarmored targets. With each specific type of target, the right combination of warhead, fuze, and motor    is    assembled    from    the    wide    variety    of components available. 2.75-Inch FFAR and LSFFAR The   2.75-inch   airborne   rocket   is   an   effective air-to-ground weapon against most targets. The FFAR is   an   air-to-air   weapon.   Fired   in   large   numbers   to produce   a   shotgun   pattern,   FFARs   are   carried   and launched   from   7-   or   19-round   launcher   packages. These packages are described later in this chapter. The  LSFFAR  is  accurately  and  safely  launched from  low-speed  aircraft  and  helicopters.  Because  of their spin feature, they cannot be ripple fired. LSFFARs are fired singly from 7- or 19-round launchers that have single-fire capability. The  2.75-inch  rockets  are  received  through  the supply system in three configurations as follows: 1. Complete rounds in 7- or 19-tube launchers, or in wooden boxes 2. Rocket  motors  in  7-tube  launchers,  and  the fuze-warhead combination in separate shipping containers 3. Separate  components  in  authorized  shipping containers Squadron  ordnancemen  based  ashore  order  and may   assemble   components   for   current   operations. Aboard ship, weapons department ordnancemen assemble the components according to the ship's air and load  plan.  They  deliver  these  assemblies  to  squadron ordnancemen for loading onto aircraft. For    detailed    information,    such    as    authorized assemblies,  safety  precautions,  and  restrictions,  you should  refer  to  Aircraft  Rocket  Systems  2.75-inch  and 5.0-inch  NAVAIR  11-75A-92.  You  can  find  additional information  in  specific  aircraft  loading  and  tactical manuals. 5.0-Inch FFAR Like  the  2.75-inch  rocket,  the  5.0-inch  FFAR  can be assembled in various warhead and fuze combinations.  The  Mk  71  motor  gives  the  additional advantage of one motor for all launch-speed applications. The  5.0-inch  rocket  is  carried  and  launched  from multiple-round  launchers.  Because  of  their  large  size and   weight,   the   number   of   rounds   per   launcher   is reduced   to   four.   The   5.0-inch   rockets   are   received through   the   supply   system   in   the   following   two configurations: 1. Rocket motors in a 4-round launcher and fuzes and warheads in separate shipping containers NOTE:  The  Mk  191,  Mk  193,  and  Model 113A  fuzes  are  permanently  installed  in  the warheads. 2. Separate   components   in   separate   shipping containers REVIEW NUMBER 4 Q1. What    is    the    usual    configuration    of    the 2.75-inch airborne rocket? Q2. Aboard   ship,   who   assembles   rocket   com- ponents for current operations? REVIEW NUMBER 3 ANSWERS A1. When  classified  by  their  mode  of  operation, fuzes are classified as impact firing, mechanical   time,   acceleration-deceleration, or proximity. A2. Impact-firing  fuzes  function  when  the  rocket strikes the target that offers enough resistance to cause actuation of the parts. 2-13