What was found
FLT JB616 JAX - JFK DURING DESCENT INTO JFK CREW REPORTED GRINDING NOISE AND LIGHT VIBRATION NOTICED IN FLIGHT DECK FOLLOWED BY A STRONG BURNING SMELL ON FINAL APPROACH WITH GRINDING NOISE GETTING LOUDER. JFK MX PERFORMED INSPECTION OF THE CABIN/COCKPIT FOR ABNORMAL SMELL IAW AMM 21-20-00-810-801A, NO ABNORMALITIES NOTED. DUE TO MULTIPLE HITS ON THE FWD FAN NR 3 EMERGENCY FAN REMOVED AND REPLACED FWD AVIONICS COMPARTMENT FWD FAN NR 3 IAW AMM 21-26-01, OPS TEST PASSED PER AMM 21-26-00, OK FOR SERVICE.