TM 10-5410-221-10 Table 3-1.  Preventive Maintenance Checks and Services-Continued Interval B - Before Operation A - After Operation M - Monthly Operator Org D - During Operation W - Weekly Q - Quarterly Daily Item to be Inspected Procedure Reference W M Q B D A 5 X X X PLUMBING CONNECTIONS Check for secure installation of plumbing connections. 6 X SHELTER FABRIC Check fabric inside and outside of airlock for wear at seams, for broken stitches, for holes, for weak spots, or other damage to fabric. 7 X ZIPPERS Check zippers for smooth operation, com- plete closure, missing teeth, unstitched seams, or other damage, apply zipper ease to zipper teeth for lubrication. 8 X FABRIC FASTENER TAPE Check for damage and unstitched seams. 9 X ELECTRICAL SYSTEM Check all electrical connections, cables, receptacles, circuit breakers and light assemblies for damage, burned contacts or insulation. Check light assemblies for burned or weak tubes. 10 X PLUMBING SYSTEM Check all lines and fittings for leaks, or other damage, check pump and float switch operation. 11 X BELLOWS ADAPTER Check fabric inside and outside of bellows for wear at seams, for fabric stitches, for holes, for weak spots, or other damage. 12 X X X SUMP CONTAINER Remove sump screen, clean and reinstall. Section IV.  OPERATOR’S MAINTENANCE 3-6.  General Operator/crew  are  not  authorized  to  repair  or  replace  parts  of the    expandable    shelter.        All    damage    requiring    repair    or replacement shall be reported to organizational maintenance.  Deviations  may  be  authorized by the Commanding officer to meet his operational requirements. Section V. 3-7.  General This   section   provides   information   useful   in   diagnosing   and correcting unsatisfactory operation or failure of the expandable shelter and its components.  Malfunctions which may occur are listed in table  3-2.    Each  malfunction  stated  is  followed  by  a   list   of probably    causes    of    the    trouble.        The    corrective    action recommended is described opposite the probable cause. Table 3-2.  Troubleshooting 1.  Water leakage into shelter a.  Weather seal assemblies damaged a.  Report discrepancy to organizational maintenance. b.  Loose or improperly positioned b.  Position seal assemblies to cover assemblies joints in shelter and secure 2.  Circuit breaker tripped a.  Eelectrical overload in circuit a.  Check circuit for overload condition and shorts, remove overload condition and reset circuit breaker. b.  Circuit breaker malfunction b.  Report discrepancy to organizational maintenance. 3-2