On climb out the 'smoke' central warning panel light illuminated. The flight attendant said her indicator said the smoke was coming from the lavatory. After investigation she found no smoke or fire. To be totally safe the reporter landed back at sbn. The mechanics made a thorough inspection and found no indications of a problem. They changed the smoke alarm and signed off the write-up. The flight departed without further incident.

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Attributes
ACN	331508
Time
Date	199603
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sbn
State Reference	IN
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sbn
Operator	common carrier : air carrier
Make Model Name	ATP Advanced Turboprop
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 210 flight time total : 3780 flight time type : 600
ASRS Report	331508
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On climb out the 'smoke' central warning panel light illuminated. The captain asked the 'a' flight attendant to tell him the location of the smoke. She informed him the lavatory was the smoke indication location according to her light panel. After further investigation she found no smoke and no fire, but to be totally safe, I turned back to sbn airport to make an uneventful landing. We quickly unloaded the 42 passenger and had our mechanics check out the lavatory smoke alarm which they replaced. We departed again without incident.

Original NASA ASRS Text

Title: ON CLBOUT THE 'SMOKE' CENTRAL WARNING PANEL LIGHT ILLUMINATED. THE FLT ATTENDANT SAID HER INDICATOR SAID THE SMOKE WAS COMING FROM THE LAVATORY. AFTER INVESTIGATION SHE FOUND NO SMOKE OR FIRE. TO BE TOTALLY SAFE THE RPTR LANDED BACK AT SBN. THE MECHS MADE A THOROUGH INSPECTION AND FOUND NO INDICATIONS OF A PROB. THEY CHANGED THE SMOKE ALARM AND SIGNED OFF THE WRITE-UP. THE FLT DEPARTED WITHOUT FURTHER INCIDENT.

Narrative: ON CLBOUT THE 'SMOKE' CENTRAL WARNING PANEL LIGHT ILLUMINATED. THE CAPT ASKED THE 'A' FLT ATTENDANT TO TELL HIM THE LOCATION OF THE SMOKE. SHE INFORMED HIM THE LAVATORY WAS THE SMOKE INDICATION LOCATION ACCORDING TO HER LIGHT PANEL. AFTER FURTHER INVESTIGATION SHE FOUND NO SMOKE AND NO FIRE, BUT TO BE TOTALLY SAFE, I TURNED BACK TO SBN ARPT TO MAKE AN UNEVENTFUL LNDG. WE QUICKLY UNLOADED THE 42 PAX AND HAD OUR MECHS CHK OUT THE LAVATORY SMOKE ALARM WHICH THEY REPLACED. WE DEPARTED AGAIN WITHOUT INCIDENT.

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.