What was found
DURING DESCENT, PASSING 4000 FEET, A DIRTY SOCK ODOR WAS STRONG. FA'S ALSO CALLED UP TO SAY THEY SMELLED THE ODOR. REACTIVATED PACK 2 IAW 21-51-00-440-002 AND (M) PROCEDURES. ACCOMPLISHED HIGH POWER RUN IAW AMM 71-00-00-710-013-C. RAN THE NR 2 PACK FROM NR 2 ENGINE BLEED AND NR 1 ENGINE BLEED AND APU BLEED, ALL SEPARATELY. ALL OPS CHECKED OK. NO ODORS PRESENT. RAN PACK 2 IN ALL FIVE CONFIGS IAW INFO NOTICE 2017-T015A SECTION B TABLE 1 AND TSM 71-00-00-810-801-A, 49-00-81-810-874A. ACFT OK FOR SERVICE.