TM 9--2350--292--20--10149 00--1EXCESSIVE INTERFERENCE WITH APU RUNNING AND APU GENERATORSWITCH ON. MAIN ENGINE IS OFF AND VEHICLE IS STATIONARY.0149 00THIS WORK PACKAGE COVERS:Excessive Interference With Apu Running And APU Generator Switch On. Main Engine Is Off And Vehicle IsStationary.INITIAL SETUP:Tools and Special ToolsGeneral mechanic’s tool kit (item 1, WP 0717 00)Equipment ConditionsVehicle MASTER switch OFF (TM 9--2350--292--10)Personnel RequiredTwoWARNINGRemove rings, bracelets, wristwatches,and neck chains before working on anyvehicle. Jewelry can catch on equip-ment and cause injury, or may shortacross an electrical circuit and causesevere burns or electrical shock.NOTEIf a steady whining interference is heard,complete Step A. If interference is a lowfrequency clicking go to Step B.CONTINUED ON NEXT PAGEnoyesA1. Open left side rear deck doors(TM 9--2350--292--10).2. Remove ground wire from APU voltageregulator.3. Thoroughly clean ground wire and groundterminal. Reinstall ground wire.4. Start APU and turn APU GEN switch and radioON (TM 9--2350--292--10). Listen forinterference.5. Turn APU GEN switch and radio OFF and shutdown APU (TM 9--2350--292--10).Is interference heard?Fault corrected.Replace voltage regulator(WP 0239 00). Verify fault iscorrected.
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