TM 55-1510-222-10 8. On the electronic module and right wing, ensure safety pins and flag assemblies are installed. 9. Slide  payload  module  assembly  into  dispenser assembly and secure two stud bolts, using 5/32- inch hexagonal wrench. b. Ammunition Unloading Procedure. WARNING All   aircraft   power   to   the   dispenser system  must  be  turned  off  prior  to removal    of    payload    module    from dispenser  assembly.    Safety  pin  flag shall   be   installed   in   the   electronic module    prior    to    landing    and    the safety  pin  flag  shall  be  installed  in the wing-mounted safety switch immediately after landing. 1. On dispenser control panel, ensure ARM-SAFE switch is in SAFE position. 2. Assure   safety   pin   and   flag   are   inserted   into electronic   module   and   in   the   wing   mounted   safety switch. WARNING If there is an indication that a misfire occurred, notify emergency ordnance     disposal     personnel     for disposition and disposal. 3. Remove   module   from   dispenser   assembly   by unscrewing  the  two  stud  bolts  with  a  5/32-inch hexagonal wrench and slide dispenser assembly out. 4. Remove retaining plate from payload module by unscrewing two retaining bolts. 5. Remove   expended   and   unexpended   impulse cartridges and flares (or chaff) from payload module. 6. Repack unexpended items in original containers and return to stores. NOTE Cracking  of  the  chaff  cartridge  case upon   firing   is   not   unusual.      This does  not  effect  performance  of  the item and should not be reported as a malfunction. 4-6.RADAR SIGNAL DETECTING SET (AN/APR-39(V) 1). The  radar  signal  detecting  set  control  panel  (fig.  4-4), located  on  the  instrument  panel  indicates  the  relative position of search radar stations.  Audio warning signals are  applied  to  the  pilot's  and  copilot's  headsets.    The radar signal detecting set is protected by the 7.5-ampere circuit breaker placarded APR39, located on the mission control  panel  (fig.  4-1).    The  associated  antennas  are shown in figure 2-1.  For operating instructions, refer to TM 11-5841-283-20. a. Radar    Signal    Detecting    Set    Control    Panel Functions (AN/APR-39(V)l) (fig.  4-4). CAUTION To   prevent   damage   to   the   receiver detector    crystals,    assure    that    the AN/APR-39(V)l  antennas  are  at  least 60  meters  from  active  ground  radar antennas   or   6   meters   from   active airborne  radar  antennas.    Allow  an extra   margin   for   new,   unusual,   or high power antennas. (1)   PWR    switch.        ON,    allow    1    minute    for warmup. (2)   SELF   TEST.      Allows   self   test   of   control panel. (3)   AUDIO control.  Adjust volume as desired. (4)   DSCRM switch. Set for mission requirement. 4-7.RADAR    SIGNAL    DETECTING    SET    (AN/APR- 39(V)2). The  radar  signal  detecting  set  control  panel  (fig.  4-5), located  on  the  instrument  panel  indicates  the  relative position   of   search   radar   emitters.      Through   graphic symbology,  the  type  of  tracking  radar  emitters  may  be identified.    Unknown  emitter  origins  are  also  depicted. Audio   warning   signals   are   applied   to   the   pilot's   and copilot's  headsets.    The  radar  signal  detecting  set  is protected  by  the  7.5-ampere  circuit  breaker  placarded APR39, located on the mission control panel (fig.  4-1). The    associated    antennas    are    shown    in    figure    2-1. Complete operating instructions are to be obtained from the appropriate vendor manuals. 4-9