ARMY TM 9-6115-639-13 AIR FORCE TO 35C2-3-386-51 MARINE CORPS TM 10155A-13/1 Table 2-1.  Operator Preventive Maintenance Checks and Services for MEP 831A / 832A (continued) Item No. Interval Location: Item to Check/ Service Procedure Not Fully Mission Capable If: 4 Before Convenience receptacle (60Hz only) Inspect receptacle for damage.  Check for signs of electrical short or corrosion. Receptacle damaged, shorted, or corroded. 5 Before NATO slave receptacle Inspect receptacle for damage.  Check for signs of electrical short or corrosion. Receptacle damaged, shorted, or corroded. 6 Before Output panel a.  Inspect output panel door for security.      Check that locking latch operates properly. WARNING: Ensure generator set is properly grounded prior to starting.  Failure to properly ground can result in serious injury or death through electrocution. b.  Check load and ground terminals for      security of attachment.  Inspect for      signs of electrical short or corrosion. c.  Check ground rod cable for proper      installation.  Check for correct connection.   Terminals are loose, disconnected, shorted, damaged, or corroded. Set is not grounded properly. 2-13