What was found
TURNED ON APU IN DCA AND BOTH FO AND CPT IMMEDIATELY SMELLED " STRONG DIRTY SOCK SMELL". T/S PER TASK CARD 0550-2002. INSP APU COMPT WITH UV BLACKLIGHT. NO EVIDENCE OF OIL OR HYD FLUID INGESTION FOUND. FOUND DEICE FLUID AT APU INLET. REMOVED APU LOAD CONTROL VALVE PER A320 AMM 49-51-51. INSPECTED BLEED DUCTS INTERNALLY - NO CONTAMINATION FOUND. REINSTALLED APU LOAD CONTROL VALVE. CLEANED RESIDUAL DEICE FLUID FROM APU INLET. RAN ENG 1 AND ENG 2 WITH BLEEDS OPERATING BOTH PACKS. STARTED APU AND WITH BLEED ON, SMELLED " DIRTY SOCK" SMELL - SMELL CLEARED AFTER ONE MINUTE. REPEATED LAST STEP AFTER 10 MIN - NO SMELL NOTED. PERFORMED TASK CARD 2100-2005 FROM STEP 1 TO STEP 5. CONTINUED TASK CARD 2100-2005 STEPS 6 TO STEP 11, C/W TASK CARD 2100 FROM STEP 12 THROUGH 34. ALL TASKS C/W. NO SMELL OR CONTAMINATION NOTED. (LP: 4351467)