TM 9-6115-659-13&P Table 4-1.  Unit Preventive Maintenance Checks and Services Location Item Interval Procedure Not Fully Mission No. Item to Capable if: Check/Service 1 Semi- POWER CABLES Inspect power cables for worn, frayed, Power cable is Annually (AN/MJQ-35, or cracked insulation, loose terminal unserviceable. AN/MJQ-35A, AND lugs, and loose connections.  Tighten as AN/MJQ-36 ONLY)   needed. 2 Semi- SWITCH BOX Inspect switch box assembly (refer to Annually ASSEMBLY paragraph 4-13). (AN/MJQ-35, AN/MJQ-35A, AND AN/MJQ-36 ONLY) 3 Semi- TRAILER LIFTING    Inspect for wear, damage, and loose Annually RINGS (AN/MJQ-35, attaching hardware.  If loose or AND AN/MJQ-36 damaged, refer to paragraph 4-21. ONLY) 4 Semi- TRAILER LIFTING    Inspect for cracks, damage, or broken Annually BRACKETS welds. (AN/MJQ-35 AND AN/MJQ-36 ONLY) 5 Semi- MOUNTING RAILS Inspect for cracks and deformation Mounting rail is Annually cracked or deformed. 6 Semi- FIRE a.  Inspect for broken seal and damage Annually EXTINGUISHER to handle. b.  Weigh to determine whether charge Fire extinguisher is sufficient.  Weight is 13 pounds not charged. when fully charged.  If weight is 12.5 pounds or less, send to specialized activity for recharging. Change 2  4-13 WARNING Before performing any maintenance that requires climbing on or under  trailer,  make  sure  that  trailer  handbrakes  are  set,  trailer front  landing  leg/support  leg  is  lowered,  and  leveling-  support jack  is  lowered.    Injury  to  personnel  could  result  from   trailer suddenly rolling or tipping.