Narrative:

At about 800 ft afl after takeoff; we got the master caution light and the aft cargo light on the overhead panel. We retracted the gear flaps and limited airspeed to 200 KTS. We leveled off at 5000 ft and declared an emergency. After discussing the situation and referring to the QRH; we elected to return to ZZZZ. We called operations at ZZZZ to inform them and to call dispatch. I briefed the flight attendants and informed the passenger on downwind for the approach. I also specifically requested to the tower that after rollout I wanted the fire chief to inspect that cargo door and the airplane in general before taxiing to the gate. Upon touchdown; the aft cargo light went out. We cleared the runway and shut down the #2 engine. The fire chief found all cargo doors to be closed and locked and the airplane ok. We taxied back to the gate.

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Original NASA ASRS Text

Title: A B737 FLT CREW RECEIVED AN 'AFT CARGO' LIGHT AFTER TAKEOFF; DECLARED AN EMERGENCY; AND RETURNED TO LAND AT THE DEP ARPT.

Narrative: AT ABOUT 800 FT AFL AFTER TKOF; WE GOT THE MASTER CAUTION LIGHT AND THE AFT CARGO LIGHT ON THE OVERHEAD PANEL. WE RETRACTED THE GEAR FLAPS AND LIMITED AIRSPD TO 200 KTS. WE LEVELED OFF AT 5000 FT AND DECLARED AN EMER. AFTER DISCUSSING THE SITUATION AND REFERRING TO THE QRH; WE ELECTED TO RETURN TO ZZZZ. WE CALLED OPS AT ZZZZ TO INFORM THEM AND TO CALL DISPATCH. I BRIEFED THE FLT ATTENDANTS AND INFORMED THE PAX ON DOWNWIND FOR THE APCH. I ALSO SPECIFICALLY REQUESTED TO THE TWR THAT AFTER ROLLOUT I WANTED THE FIRE CHIEF TO INSPECT THAT CARGO DOOR AND THE AIRPLANE IN GENERAL BEFORE TAXIING TO THE GATE. UPON TOUCHDOWN; THE AFT CARGO LIGHT WENT OUT. WE CLEARED THE RWY AND SHUT DOWN THE #2 ENG. THE FIRE CHIEF FOUND ALL CARGO DOORS TO BE CLOSED AND LOCKED AND THE AIRPLANE OK. WE TAXIED BACK TO THE GATE.

Data retrieved from NASA's ASRS site as of May 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.