operation.  For  example,  the  computer  may  cue  the operator to turn on the bomb bay door switch and the master arm switch. The P-C3 computer also uses the ordnance  panel  to  instruct  the  ordnance  crew  member on  how  to  perform  certain  pressurized  SLT  loading  or unloading  operations  (exchange  between  storage  rack and SLTs). This enables the ordnance crew member to make available the search store requested by the TACCO. 5.  Present  the  operator  with  alternatives  for which decisions are required; for example, arming has three  selections  (nose,  tail,  or  both).  The  computer also furnishes alerts, such as components or circuit failures  and  selections  errors,  to  bring  important developments  to  the  operator’s  attention. 6.   Calculate   and   initiate   fly-to-point   store releases,  intervals  between  releases  for  train  releases, and furnish system release commands in response to crew  member  release  commands. 7.  Secure  the  system  following  each  weapon release,  check  store-in-place  status,  update  the inventory, and prepare the system for the next store selection. MANUAL  MODE.—  In  the  P-C3,  the  manual mode  provides  the  TACCO  with  management control  of  all  kill  and  search  stores.  In  the  S-3A, each  crew  member  controls  kill  and  search  stores under  the  management  of  the  pilot  and  TACCO conjunctival  y. In  the  manual  mode,  the  P-C3  TACCO/S-3A  pilot selects the bomb bay or wing station for release, along with  the  arming  and  release  mode  of  the  selected store. These actions are executed by the control on the  weapons  control  panel.  If  required,  the  pilot  is cued to turn on the master arm switch and open the bomb bay doors. When the station, arming, and release modes in the P-C3 have been selected, the master arm power will  be  on,  the  bomb  bay  doors  will  open  (if required), and the kill ready lights on the ACP and TACCO  manual  weapons  control  panel  will illuminate.  If  the  selected  station  is  loaded,  the station  select  keys  on  the  ACP  will  light  amber (S-3A). The store may then be released by the pilot, copilot,  or  TACCO  (also  the  SENSO  in  the  S-3A) by use of their release switches. The P-C3 search store release and control in the manual  mode  is  completed  by  the  ordnance  crew member  using  the  controls  on  the  search  stores interconnection box. The desired SLT is selected by using the letter and number switches. This cues the pilot to turn on the search power switch. When the SLT  has  been  selected  and  search  power  is  on,  a launch is effected by actuating the sono launch switch on  the  search  stores  interconnection  box. Jettison Store jettison of both aircraft is somewhat similar in  operation  and  control.  Manual  actuation  of  the jettison  or  the  external  jettison  switch  by  the  pilot disables the arming circuit and initiates jettison. In   the   P-C3,   the   jettison   programmer   is energized  and  sends  sequential  release  and  bomb bay  door  open/close  signals.  Wing  stations  are released  in  pairs  (one  from  each  wing)  from outboard  stations  to  inboard  stations  at  2-second intervals.  At  this  same  time,  the  bomb  bay  doors are opening. Then, the lower stations are released, the upper stations release after the lower stations, and then the doors are closed. A separate switch on the pilot’s console initiates the jettison function for wing stations only. Selective jettison  from  any  station  may  be  accomplished through normal manual release with the arming select (TACCO weapons panel) set on safe. In the S-3A, the wings and SLTs receive jettison commands from the wing and search store decoders to release all wing stores and 59 SLTs. The SAR chute remains  loaded. Bomb  bay  stores,  wing  stores  only,  and  wing stores from auxiliary devices (such as flare launchers) are released by using the ACP AUX rotary switch. This is done according to the load to be jettisoned. In this   situation,   the   mechanical   arm   thumb-wheel selector must be set to safe, and the arm set switch depressed.  Armed  store  releases  may  also  be  initiated in  the  above  reamer. When the aircraft is on the ground, the jettison circuits   of   both   aircraft   are   disabled   by   the weight-on-wheels   switches.   These   switches   are located on the right and left main landing gear (main mounts). 7-20