What was found
EN ROUTE BETWEEN ELP AND TOL IN CRUISE FLT AT FL 37, THE MAIN CARGO SMOKE DETECTOR LIGHT ILLUMINATED, FOLLOWED BY AN ACRID SMELL. THE FE DONNED A PBE AND ENTERED THE MAIN CARGO COMPARTMENT, BUT SAW NO VISIBLE SMOKE. THE A/C DIVERTED TO OKC, DETAILED INSPECTIONS ACCOMPLISHED. THE SMOKE DETECTOR SYSTEM WAS SMOKE TESTED AND FOUND OPERATIONAL. NO ACRID SMELL COULD BE DETECTED. DURING CARGO OFF LOAD, IT WAS NOTED THAT A RESIDUAL ACRID SMELL WAS PRESENT IN THE NR 4 BELLY CARGO COMPARTMENT. WHEN THAT CARGO WAS TRANSFERRED TO A CONTAINER, THE RESIDUAL ACRID SMELL FOLLOWED. AN INSPECTION OF THAT CARGO REVEALED NO VISIBLE SIGN OF COMBUSTION. REFERENCE IXXA9682. (M)