TM 1-1500-204-23-4 (d)     Contact     safety     specialist     and medical personnel to determine the extent of contamination  and  corrective  procedures  to  follow.    A mercury vapor detector will be used to monitor the air in areas    where    mercury    contamination    is    suspected. Operations will not be resumed until the concentration of mercury   vapor   drops   below   0.05   milligram   per   cubic meter. (e) Recover visible droplets of mercury    with    a    mercury    vacuum    cleaner,    mercury scoop,  or  a  suction  device  equipped  with  a  water  trap. The  contaminated  areas  should  then  be  coated  with  a mercury   suppressant,   such   as   one   percent   calcium polysulphide,    flours    of    sulfur,    or    equivalent;    then carefully  sweep  and  pick  up  contaminated  suppressant materials,  and  wet-mop  the  area.    The  decontaminants do  not  remove  mercury  but  coat  the  droplets  and  thus reduce  volatilization  of  the  mercury.    Monitoring  of  the area with a mercury vapor detector should be performed to  determine  the  thoroughness  of  the  decontamination procedures. (f) Air-conditioning systems of Sheffield Modulabs will be deactivated until contaminated  areas  have  been  decontaminated.    Area will   be   monitored   with   a   mercury   vapor   detector   to determine thoroughness of decontamination. (7)    Maintenance.        To    ensure    that    the manometer is ready for operation at all times, it must be inspected     systematically     before,     during,     and     after operation.  Defects should be discovered and corrected before they result in serious damage or failure.  Defects or   unsatisfactory   operating   characteristics   beyond   the scope of the operator to correct must be reported at the earliest     opportunity     to     organizational     maintenance. Responsibility for performance of preventive maintenance  services  rests  not  only  with  the  operator, but with the entire chain of command from section chief to commanding officer. b.        Vacuum    Chambers.        Vacuum    chamber maintenance  procedures  are  covered  in  the  following paragraphs. (1) Inspection.  Inspect door seal for defects or damage.  When seal is damaged to the extent that it will  not  seal  properly,  it  shall  be  replaced.    A  thin  coat glycerol, Federal Specification O-G-491, may provide a temporary seal when defects are slight. WARNING Drycleaning  solvent  is  flammable and solvent vapors are toxic.  Use P-D-680,   Type   11   Solvent   in   a well-ventilated  area.    Keep  away from open flames. Avoid prolonged   solvent   contact   with skin. (2)   Cleaning.      Periodically   clean   vacuum chamber with a cloth dampened in drycleaning solvent, Federal   Specification   P-D-680,   and   wipe   dry   with   a clean cloth. c.    Turntable  Instrument  Tester.      The   turntable instrument  tester,  as  shown  in  figure  4-4,  is  used  for testing  gyroscopic  instruments  that  are  not  required  to indicate aircraft attitude. (1)  Inspection.    Periodic  inspection  of  the unit is required after every 200 hours of operation.  The only   inspection   required   is   for   chipped,   broken,   or cracked gears and components. Figure 4-4.  Turntable Instrument Tester 4-5