A DC9-50 while parked at a gate with passenger experienced a cargo smoke overheat warning. Discharged #1 bottle, advised tower, and deplaned passenger. Caused by a false warning.

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Attributes
ACN	495938
Time
Date	200012
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ito.airport
State Reference	HI
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ito.tower
Operator	common carrier : air carrier
Make Model Name	DC-9 50
Operating Under FAR Part	Part 121
Flight Phase	ground : preflight ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp technician : inspection authority
Experience	flight time last 90 days : 200 flight time total : 15500 flight time type : 3000
ASRS Report	495938
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	aircraft equipment other aircraft equipment : cargo smoke ouht warning other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Environmental Factor Aircraft
Primary Problem	Aircraft

Narrative:

At gate, engines off. APU on. Had master caution lights come on along with forward cargo smoke indication. Testing system gave normal indications. Upon test button release, system activated again, and discharged #1 bottle. Our procedure eventually disengaged #2 bottle. Deplaned passenger through front door and jetway. No injuries, no sign of fire upon inspection.

Original NASA ASRS Text

Title: A DC9-50 WHILE PARKED AT A GATE WITH PAX EXPERIENCED A CARGO SMOKE OVERHEAT WARNING. DISCHARGED #1 BOTTLE, ADVISED TWR, AND DEPLANED PAX. CAUSED BY A FALSE WARNING.

Narrative: AT GATE, ENGS OFF. APU ON. HAD MASTER CAUTION LIGHTS COME ON ALONG WITH FORWARD CARGO SMOKE INDICATION. TESTING SYS GAVE NORMAL INDICATIONS. UPON TEST BUTTON RELEASE, SYS ACTIVATED AGAIN, AND DISCHARGED #1 BOTTLE. OUR PROC EVENTUALLY DISENGAGED #2 BOTTLE. DEPLANED PAX THROUGH FRONT DOOR AND JETWAY. NO INJURIES, NO SIGN OF FIRE UPON INSPECTION.

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.