TM 55-1930-209-14&P-16 Table C-1.  Preventive Maintenance Checks and Services for Ventilation, Heating and Air Conditioning System (Continued) B - Before D - Daily Q - Quarterly D - During W - Weekly S - Semiannually A - After M - Monthly A - Annually PROCEDURES INTERVAL CHECK FOR AND HAVE EQUIPMENT ITEM ITEM TO BE REPAIRED OR ADJUSTED IS NOT READY/ NO. B D A D W M Q S A INSPECTED AS NECESSARY AVAILABLE IF l l c .Check for rust, corrosion, and worn or chipped paint Remove by wire brushing. chipping or scraping.  Immediately paint cleaned area with zinc chromate paint and finish to match surrounding area In accordance with TB 43- 0144 WARNING Always make sure that electrical power is OFF before performing any maintenance on electrical systems.  Red tag appro- priate switches and circuit breakers with: "WARNING DO NOT ACTIVATE. REPAIRS BEING MADE." Observe all safety precautions listed at the beginning of this manual. 2 l l Air Ducts a.   Make sure that air ducts are free of Air ducts obstructions, dents, and other damage obstructed or damaged l l l b.   Check for rust, corrosion, and worn or chipped paint.  Remove by wire brushing, chipping, or scraping.  Immediately paint cleaned area with zinc chromate paint and finish to match surrounding area in accordance with TB 43-0144 Do not paint threads or labels. l l c.    Check for loose or missing fasteners and securements Tighten or replace as neces- sary. 3 Fans and Motors WARNING Always make sure that electrical power is OFF before performing any maint- enance on electrical systems. Redtag appropriate switches and circuit breakers with: "WARNING DO NOT ACTIVATE.  REPAIRS BEING MADE." Observe all safety precautions Iisted at the beginning of this manual. l l l a.   Visually inspect fans and motors for dam-   Fans or age. motors damaged. l l l b.   Check fan blades for sufficient clearance Fan blades and cleanliness do not have l l l c.    Check that electrical connections are tight.  sufficient Tighten or repair as necessary using clearance. insulated tools C-4