TM 10-3930-659-10 Table 2-1.  Preventive Maintenance Checks and Services (Con’t). LOCATION ITEM ITEM TO NOT FULLY MISSION NO. INTERVAL CHECK/ PROCEDURE CAPABLE IF: SERVICE 40 Weekly Batteries WARNING · Remove  all  Jewelry  such  as  rings,  dog  tags, bracelets,   etc.      If   jewelry   contacts   battery terminal,  a  direct  short  will  result,  causing Instant  heating  of  Jewelry  which  will  result in severe Injury to personnel. ·  DO  NOT  perform  battery  system  checks  or inspections    while    smoking    or    near    fire, flames,  or  sparks.    Batteries  may  explode, causing  serous  Injury  or  death  to  person- nel. Visually check batteries for de- One or more batter- fects such as burned or corroded ies are missing or terminals, or a cracked or dam- unserviceable.  Any aged case. loose  terminal  or cable.  Any battery hold- down not secure. 41 Weekly Air Cleaner WARNING If  NBC  exposure  Is  suspected,  all  engine  air cleaner  air  filter  media  should  be  handled  by personnel wearing protective equipment. Consult your NBC  Officer  or  NBC  NCO  for  ap- propriate handling or disposal procedures. a.  Visually check air cleaner a.  Any evidence of cover and air cleaner assem- damage to air bly for security of mounting cleaner cover, and damage. body, or mount- ing that will allow unfiltered air to enter engine. b.  Remove air cleaner primary filter element (see paragraph 3-11). 2-32