TM 10-3930-659-10 Table 2-1.  Preventive Maintenance Checks and Services (Con’t). LOCATION ITEM ITEM TO NOT FULLY MISSION NO. INTERVAL CHECK/ PROCEDURE CAPABLE IF: SERVICE 4 Before Air Cleaner Dust Valve WARNING If  NBC  exposure  is  suspected,  all  engine  air cleaner  air  filter  media  should  be  handled  by personnel wearing protective equipment. Consult   your   NBC   Officer   or   NBC   NCO   for appropriate handling or disposal procedures. Squeeze dust valve (2) to remove dust from air cleaner. TA704482 2-16