TM 9-2320-364-102-69Table 2-1. Operators Preventive Maintenance Checksand Services (Before) - CONT.LocationItemNo.IntervalItem toCheck/ServiceProcedureNot Fully MissionCapable if:11BeforeControlsandIndicators -Cont.(n) Check the CTIS (18) for properoperation.(1) Place CTIS ON/OFFswitch (19) to ON position.(2) Press START button (20) and hold for one second.(3) Lights (21) will lightmomentarily and go out.(4) A solid LOW AIR light (22)will illuminate if trucks air system pressure is too low.A flashing LOW AIR light indicates a CTIS leak or malfunction.(5) Lights (21) will blink when tires are filling and will staysteady when tires are filled todesired setting.