TM 1-1500-204-23-4Figure 3-9. Inverter(4) Replacement criteria.Inverterreplacement criteria are as follows:·Replace rotary inverters whenany unusual bearing or gearnoises are detected duringoperation.·Replace rotary inverters whencommutator bars are rough,scored, pitted, loose, high, orworn to the depth of insulatingmica between bars.·Replace rotary inverter brushesthat are cracked, broken,chipped, unevenly worn, orworn beyond maximum wearingdepth slot.·Replace static inverters whenelectrical connectors havebroken pins or crackedconnector inserts.·Replace static inverters thathave cracked cases.·Replace static inverters that failto operate properly.NOTERemove components from aircraftwhen replacing brushes.d. Starters.Army aircraft are started by a devicecalled a starter. The starter develops large amounts ofmechanical energy, causing the engine to rotate.(1) Types.The following paragraphs namevarious starters used with turbine engines. Turbineengine starters. Turbine engines use air-turbine(pneumatic) or electric starters. The air-turbine starter isbecoming the most common type.(2) Inspection.General inspectionprocedures for starters removed from the aircraft andstarters installed on the aircraft are described in thefollowing paragraphs.3-15
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