A B727-200 ON DSCNT AT FL180 DECLARED AN EMER DUE TO SMELL OF SMOKE IN THE CABIN.

Narrative

DSNDING INTO SALT LAKE CITY; COCKPIT CREW ENCOUNTERED SMELL OF SMOKE IN COCKPIT. FLT ATTENDANTS WERE NOTIFIED AND SMELL OF SMOKE IN CABIN WAS ALSO PRESENT. PREVIOUS TO DSCNT INTO SALT LAKE CITY; APPROX 100 MI E OF DENVER; A FAINT SIMILAR SMELL WAS NOTICED. COCKPIT DISCUSSION CONCLUDED THAT FOREST FIRES IN NEW MEXICO WERE A PROBABLE FACTOR OF DISTINCT; NON ELECTRICAL ODOR. STRATUS LAYERS OF SMOKY CONTENT WERE OBSERVED AT ALT. DIVERTS AND DSCNT WERE NONETHELESS DISCUSSED. SMELL OF SMOKE DISSIPATED WITHIN 5 MINS AND FLT TO SALT LAKE CITY WAS CONTINUED. THE FLT PROCEEDED NORMALLY FOR ABOUT THE NEXT HR. AT APPROX FL180 ON DSCNT INTO SALT LAKE CITY; THE SMELL RETURNED STRONGER THAN BEFORE. AN EMER WAS DECLARED; THE APPROPRIATE CHKLISTS COMPLETED AND THE ACFT WAS GIVEN PRIORITY HANDLING FOR THE REMAINING 40 MI TO THE SLC ARPT. AT NO TIME WAS SMOKE VISIBLE WITHIN ACFT. SLC CFR PERSONNEL MET ACFT AND INSPECTED EXTERIOR. NOTHING EXCEPTIONAL WAS NOTED. THE ODOR APPEARED TO DISSIPATE; SO THE ACFT TAXIED TO THE GATE. MAINT PERSONNEL MET THE ACFT AT THE GATE AND UPON ENTERING REMARKED OF A DISTINCT 'SMOKY' SMELL IN THE ACFT. MAINT CHANGED THE PACK COALESCER BAGS AND CLRED ACFT FOR FLT. COMPANY OPS CLRED THE CREW TO CONTINUE THE ROTATION AND FLC FLEW THE SAME ACFT ON THE NEXT SEGMENT WITHOUT FURTHER INCIDENT.