An A300 flight crew received a main cargo deck smoke warning shortly after takeoff. They declared an emergency and returned to land at departure airport.

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Attributes
ACN	721980
Time
Date	200612
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzzz.airport
State Reference	FO
Altitude	agl single value : 2500
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 40 flight time total : 15000 flight time type : 3000
ASRS Report	721980
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	aircraft : evacuated flight crew : diverted to another airport flight crew : landed in emergency condition flight crew : declared emergency
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On initial climb thru 2500 ft; a single chime for duct overheat. Around 5000 ft; continuous repetitive chime for main cargo deck smoke. Decided to return to ZZZZ as soon as possible. Declared emergency; asked for equipment to stand by. During vectoring for short approach; several more smoke warnings in various compartments; including the avionics compartment. Unable to silence audible alarms. After touchdown; taxied off the active runway to accessible position. Set parking brake. Verified smoke present in main deck cargo hold. Shut down engines and evacuated aircraft via emergency slide. Total time in air 10 mins.

Original NASA ASRS Text

Title: AN A300 FLT CREW RECEIVED A MAIN CARGO DECK SMOKE WARNING SHORTLY AFTER TAKEOFF. THEY DECLARED AN EMER AND RETURNED TO LAND AT DEP ARPT.

Narrative: ON INITIAL CLB THRU 2500 FT; A SINGLE CHIME FOR DUCT OVERHEAT. AROUND 5000 FT; CONTINUOUS REPETITIVE CHIME FOR MAIN CARGO DECK SMOKE. DECIDED TO RETURN TO ZZZZ ASAP. DECLARED EMER; ASKED FOR EQUIPMENT TO STAND BY. DURING VECTORING FOR SHORT APCH; SEVERAL MORE SMOKE WARNINGS IN VARIOUS COMPARTMENTS; INCLUDING THE AVIONICS COMPARTMENT. UNABLE TO SILENCE AUDIBLE ALARMS. AFTER TOUCHDOWN; TAXIED OFF THE ACTIVE RWY TO ACCESSIBLE POSITION. SET PARKING BRAKE. VERIFIED SMOKE PRESENT IN MAIN DECK CARGO HOLD. SHUT DOWN ENGINES AND EVACUATED ACFT VIA EMER SLIDE. TOTAL TIME IN AIR 10 MINS.

Data retrieved from NASA's ASRS site as of January 2009 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.