Narrative:

Cargo smoke warning came on. Performed emergency checklist, requested priority handling, crash and rescue at landing, and immediate return for landing. Although this warning may have been caused by arcing cargo light (located near detector) this aircraft has had numerous false warnings due to high humidity and faulty warning system. We need clear training as to how these warnings should be handled. (If light is out, is emergency past? If light comes on during taxi, should we activate extinguisher and evacuate/evacuation aircraft?) also, improvement of the system may help. Supplemental information from acn 370159: once fire extinguisher was activated, warning light went out. We advised ATC of intention to return to boston. Aircraft was stopped clear of runway, captain and fire crews inspected cargo area, found no evidence of fire. Aircraft was closed up, and taxied to gate to off-load passenger.

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Original NASA ASRS Text

Title: SF340 ON CLBOUT GOT CARGO SMOKE WARNING. SOP FOLLOWED AND WARNING WENT OUT WHEN FIRE EXTINGUISHER ACTIVATED. RETURNED BOS WITH PRIORITY HANDLING. CHKED CARGO COMPARTMENT WHEN CLR OF RWY AND NO EVIDENCE OF FIRE. TAXIED TO THE GATE.

Narrative: CARGO SMOKE WARNING CAME ON. PERFORMED EMER CHKLIST, REQUESTED PRIORITY HANDLING, CRASH AND RESCUE AT LNDG, AND IMMEDIATE RETURN FOR LNDG. ALTHOUGH THIS WARNING MAY HAVE BEEN CAUSED BY ARCING CARGO LIGHT (LOCATED NEAR DETECTOR) THIS ACFT HAS HAD NUMEROUS FALSE WARNINGS DUE TO HIGH HUMIDITY AND FAULTY WARNING SYS. WE NEED CLR TRAINING AS TO HOW THESE WARNINGS SHOULD BE HANDLED. (IF LIGHT IS OUT, IS EMER PAST? IF LIGHT COMES ON DURING TAXI, SHOULD WE ACTIVATE EXTINGUISHER AND EVAC ACFT?) ALSO, IMPROVEMENT OF THE SYS MAY HELP. SUPPLEMENTAL INFO FROM ACN 370159: ONCE FIRE EXTINGUISHER WAS ACTIVATED, WARNING LIGHT WENT OUT. WE ADVISED ATC OF INTENTION TO RETURN TO BOSTON. ACFT WAS STOPPED CLR OF RWY, CAPT AND FIRE CREWS INSPECTED CARGO AREA, FOUND NO EVIDENCE OF FIRE. ACFT WAS CLOSED UP, AND TAXIED TO GATE TO OFF-LOAD PAX.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.