TM 55-1930-209-14&P-19 Table 16-4.  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 INTERVAL ITEM PROCEDURES EQUIPMENT ITEM TO BE CHECK FOR AND HAVE IS NOT READY/ NO. INSPECTED REPAIRED OR ADJUSTED AVAILABLE IF B   D   A   D  W  M   Q   S   A AS NECESSARY VOIDS VENTILATION SYSTEM NOTE If the voids ventilation system equipment fails to operate, troubleshoot according to TM 55-1930-209-14&P-16.  Report deficien- cies and failures to the shift leader or bargemaster.  Use proper forms to describe maintenance or repair problems.  Keep ven- tilation, heating, and air conditioning sys- tem operations and PMCS logs current. 1 • Hatches a.      Make sure hatch covers that are in open position are secured with cotter pins and cotter keys. • b.      Check for damage to watertight hatches Hatches are dam- and light-proof louvers.  Repair as neces- aged or leak. sary. • 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. 2 • • Air Ducts WARNING Always make sure that electrical power is OFF before performing any maintenance on electrical systems.  Redtag appropriate switches and circuit breakers with: "WARNING - DO NOT ACTIVATE.  REPAIRS BEING MADE." Observe all safety precau- tions listed at the beginning of this manual. a.      Make sure that air ducts are free of Air ducts are dam- obstructions, dents, and other damage. aged or obstructed. • • b.      Check for rust, corrosion, and worn or chipped paint.  Remove by wire brushing, chipping, or scraping.  Immediately paint cleaned area in accordance with TB 43- 0144.  Do not paint threads or labels. • • c.   Check for loose or missing fasteners and securements.  Tighten or replace as nec- essary. 16-12