TM 5-3610-252-14 Table 1-1. OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES - Cont IN- TER- VAL Q A ITEM  TO  BE  INSPECTED PROCEDURE B - Before W - Weekly AN . Annually D - During (Number)   . Hundreds of Hours M - Monthly s A - After - Semiannually Q - Quarterly BI -  Biennially ITEM NO. 1 VAN BODY - Cont Inspect Interior - Cont 9. a. b. c. d. 10. Inspect light traps. Turn  on  fluorescent  lamps  (high  level). Close entrance doors. Have exhaust fan and air vent open. Inspect  for  light  leakage through vents. Place  light  switches  ON;  blackout  override switches OFF. Open door and make sure internal lights go off. Inspect/clean  interior. Death or serious or damp cloth is gized  equipment, WARNING injury may occur if wet used to wipe or clean ener- power cords, or cables. CAUTION Do not sweep interior. Dislodged dirt or  dust  will  ruin  optical,  electronic, and  photographic  equipment  and  supplies. a. Wipe vertical and horizontal painted surfaces with cleaning cloth moistened” with solution of general  purpose  detergent  and  fresh  water  until soil is removed from painted surfaces. b. Dry vertical and horizontal painted surfaces with clean cloth. c. Vacuum  interior  of  section  to  remove  dirt  and waste. Pay  particular  attention  to  work  sta- tions. For  Readiness Reporting, Equipment  Is Not  Ready/ Available  If: Light leaks are  present. Blackout system is inoperable. 1-20