What was found
AFTER STARTING DESCENT OUT OF 16,000 FT, HEAT-TYPE ODOR NOTED SHORTLY AFTER MAKING INITIAL POWER REDUCTION. ODOR SUBSIDED AND ATTRIBUTED TO OCCASIONAL PACK SMELL. SOP UNTIL AFTER PASSING APPROX 400 AGL. A/C CONFIGURED AND SET FOR NORMAL VMC ILS. NR 1 ENGINE ITT SURGED TO 1096 BEFORE LOSING INDICATIONS AND COMPRESSOR-STALL LIKE BANG FELT FOLLOWED BY N1 UNSPOOLING RAPIDLY. QUICK YAW AND SPEED DEGRADING QUICKLY. FLAPS SET TO 22 WITH 10 KNOT BUMP TO VREF. EMERGENCY DECLARED. FLT LANDED W/O INCIDENT. NO FIRE OR SMOKE IN CABIN. NO EVACUATION NEEDED. MX FOUND LARGE CHUNKS OF METAL IN INTAKE. R & R NR 1 ENGINE IAW J/C. OPS CHECK AND LEAK CHECK GOOD.