B727-200 crew had the main cargo smoke detector warning sound. The warning sounded a second time. The crew declared an emergency and returned to the departure airport.

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Attributes
ACN	604072
Time
Date	200312
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : geg.airport
State Reference	WA
Altitude	msl single value : 4500
Environment
Flight Conditions	IMC
Weather Elements	Ice
Light	Night
Aircraft 1
Controlling Facilities	tracon : geg.tracon
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time total : 7600 flight time type : 630
ASRS Report	604072
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : flight engineer pilot : atp
ASRS Report	604362
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : diverted to another airport flight crew : landed in emergency condition flight crew : declared emergency other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On takeoff climb out, main cargo smoke detector warning sounded, with one zone light illuminated. Silenced the bell and initiated emergency checklists. Emergency was declared, and main cargo smoke detector warning sounded again. This time with an additional zone light illuminated (total of 2). Emergency return was initiated, emergency fuel dump initiated, and overweight landing accomplished (dump terminated at 1000 ft AGL). Taxied clear of runway, ground crew (fire fighters) found no evidence of fire. Turned aircraft over to maintenance.

Original NASA ASRS Text

Title: B727-200 CREW HAD THE MAIN CARGO SMOKE DETECTOR WARNING SOUND. THE WARNING SOUNDED A SECOND TIME. THE CREW DECLARED AN EMER AND RETURNED TO THE DEP ARPT.

Narrative: ON TKOF CLBOUT, MAIN CARGO SMOKE DETECTOR WARNING SOUNDED, WITH ONE ZONE LIGHT ILLUMINATED. SILENCED THE BELL AND INITIATED EMER CHKLISTS. EMER WAS DECLARED, AND MAIN CARGO SMOKE DETECTOR WARNING SOUNDED AGAIN. THIS TIME WITH AN ADDITIONAL ZONE LIGHT ILLUMINATED (TOTAL OF 2). EMER RETURN WAS INITIATED, EMER FUEL DUMP INITIATED, AND OVERWT LNDG ACCOMPLISHED (DUMP TERMINATED AT 1000 FT AGL). TAXIED CLR OF RWY, GND CREW (FIRE FIGHTERS) FOUND NO EVIDENCE OF FIRE. TURNED ACFT OVER TO MAINT.

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.