Chaff Module You load the chaff module (item 7) with chaff, decoy flares, jammers, or a mixture of these payloads and a squib board (item 6). Then, insert it into the module cavity (item 5). Secure the chaff module in the cavity by locking the four positive locking latches (item 9). The 120 chaff tubes (item 10) contain the payloads. Each pod houses two separate modules. Squib Board The  squib  board  (item  6)  has  four  layers  fastened and bonded together. The top layer is a thin sheet metal cover. The second layer is composed of edge spacers to provide a wire cavity for squib circuits. The remaining layers   are   composed   of   electrical   insulating   and fire-retardant materials. Two 61-pin electrical connectors connect the squib board harness (item 13) to the intervalometer circuitry. Place the squib board, with 120 Mk 131 or CCU-63/B impulse cartridges inserted, on  top  of  the  chaff  module  and  secure  it  with  eight captive attachment screws. Intervalometer The  intervalometer  (item  2)  is  used  to  control  the burst rate. The intervalometer circuitry responds to the settings  on  the  pod  control  indicator  or  the  cockpit control    indicator.    The    intervalometer    contains    a solid-state   component   electronic   timing   pulsar   to switch   the   two   automatic   stepping   switches.   The stepping switches will operate individually for singles firing or in parallel for doubles firing. Lanyard Disconnect Switch The lanyard disconnect switch (item 11) is the main safety  feature  preventing  cartridge  detonation  during chaff  loading  and  ground  maintenance.  The  switch  is normally   in   the   closed   position.   It   is   deactivated (opened)  by  inserting  the  lanyard  pin  in  the  switch socket.  With  the  pin  inserted,  the  lanyard  disconnect switch opens the intervalometer circuitry and removes the electrical path to the squib board circuits. Access Plates The two access plates (item 12) provide access to the pod electrical connectors. Pod Control Indicator The pod control indicator (fig. 10-25) is located on the  bottom  center  of  the  pod.  It  provides  a  means  of selecting   the   burst   rate   and   firing   sequence.   The controls   are   preset   before   flight   to   meet   expected mission    requirements.    Table    10-1    lists    the    eight 10-22 Figure 10-25.—Pod control indicator. SINGLE-DOUBLE POSITION BURST RATE POSITION TOTAL TIME TO EMPTY SINGLE SINGLE SINGLE SINGLE DOUBLE DOUBLE DOUBLE DOUBLE 1/4 SEC (0.25 Sec) 1/2 SEC (0.5 Sec) 1 SEC 2 SEC 1/4 SEC (0.25 Sec) 1/2 SEC (0.5 Sec) 1 SEC 2 SEC 1 minute 2 minutes 4 minutes 8 minutes 30 seconds 1 minute 2 minutes 4 minutes Table 10-1.—Firing Time and Sequence