What was found
INTERMITTENT BURNING ODOR, DURING DESENT. CREW STATED DID NOT SEE ANY SMOKE, IT WAS A RUBBER ODOR AND NOT OVERPOWERING. PERFORMED SNIFF TEST OF THE AVIONICS IN AVIONICS BAY. MAIN CARGO COMPT, FLT DECK AND BELLIES WITH PACKS RUNNING ON APU. RAN BOTH ENGINES IAW JRH USING ENG PNEUMATICS AND PACKS RUNNING AND NO ODOR WAS PRESENT. PERFORMED CHECKS AS OUTLINED IN AMM 21-00-21-2 NO ABNORMALIES PRESENT.