ARMY TM 9-6115-670-14&P 4-115 4.45.  AIR FILTER (SICPS, JTACS, AND WIN-T). This task covers: a. Inspect b. Service c. Replace INITIAL SETUP Tools General Mechanic's Tool Kit (Item 1, Appendix B) Equipment Conditions MASTER ON-OFF switch on APU control unit   set to OFF. Materials/Parts Air Filter INSPECT a.  Inspect Air FIow Restriction Indicator.  If indicator shows restriction (indicator is red) or continues to show restriction (red) after button on indicator is pressed, service or replace filter. SERVICE a.  Open air filter housing (1) by unbuckling two buckles (2) on outside of case.  Remove end cover (3) of air filter housing and take out filter element (8). b.  Inspect element for dirt, oil and other contaminants. c.  Clean the air filter element (8) with compressed air by blowing air from the inside out.  If filter element is still contaminated with dirt and oil after cleaning, replace the filter element. d.  Install the air filter element (8). e.  Install filter end cover (3) and close buckles (2) on outside of case. REPLACE a.  Remove two slotted hex machine bolts, flat washers and lock washers (4) securing air filter mounting bracket (9) to top of generator cover. WARNING Compressed air shall not be used for cleaning purposes except where reduced to less than 29 pounds per square inch  gauge  (psig)  (199.94  kPa)  and  then  only  with effective    chip    guarding    and    personnel    protective equipment.  Compressed air is dangerous and can cause serious bodily harm if protective means or methods are not  observed  to  prevent  chip  or  particle  (of  whatever size) from being blown into the eyes or unprotected skin of the operator or other personnel. NOTE Air  pressure  at  the  nozzle  must  not  exceed  100  psi (7kgf/cm²).