What was found
BOTH CREW MEMBERS AND TWO JUMPSEATERS SMELLED AN ACRID ODOR DURING DESCENT THROUGH 10000 FT. RAN QRC AND QRH FOR SMOKE AND FUMES. DECLARED AN EMERGENCY WITH SPOKANE APPROACH. LANDED RUNWAY 03, CLEARED THE RUNWAY AND SHUT DOWN ENGINES. HAD FIRE DEPT INSPECT AIRCRAFT AND OPENED COCKPIT WINDOWS, ODOR HAD DISSIPATED AND NO DAMAGE OBSERVED BY GROUND PERSONNEL. TOWED TO GATE. EMERGENCY DECLARED IAW AMM 05-51-56 FIM 21-00-21-810. VISUALLY INSPECTED ENGINE INLETS, PACK INLET / EXHAUST PACK BAYS WHEEL WELLS NO FAULST NOTED. SNIFF TEST DONE IN ALL CARGO AREAS AS WELL AS LAV NO FAULTS NOTED. RAN APU WITH BOTH PACKS AND ALSO WITH EACH INDIVIDUAL PACK NO FUMES OR SMELLS NOTED RAN BOTH ENGINES WITH DIFFERENT PACK CONFIGURATIONS NO FUMES OR SMELLS NOTED. PERFORMED AIR CONDITIONING SYSTEM OIL SMOKE / FUME REMOVAL IAW AMM 21-00-21-2 ZERO FUMES OR SMOKE RESULTED FROM BLOW OUT. OK TO CONTINUE.