Air carrier flight experiences false warning.

Attributes
ACN	464345
Time
Date	200002
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pwm.airport
State Reference	ME
Altitude	msl single value : 14000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pwm.tracon tower : ord.tower
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 199 flight time total : 5246 flight time type : 1721
ASRS Report	464345
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : warning system other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Flight scheduled to operate from bhb to bos, declared an emergency and diverted to pwm when the 'aft cabin door' annunciator illuminated shortly after leveloff at cruise altitude. Upon landing at pwm, the cargo door was inspected and found to be properly locked and in good working condition. Maintenance was apprised of the situation and the item was deferred in accordance with MEL. In compliance with MEL a flight crew member inspected and confirmed the door closed and latched prior to each flight and the fasten seatbelt sign was left illuminated. During the subsequent flight from pwm to bos the annunciator operated normally and no further discrepancy was noted.

Original NASA ASRS Text

Title: ACR FLT EXPERIENCES FALSE WARNING.

Narrative: FLT SCHEDULED TO OPERATE FROM BHB TO BOS, DECLARED AN EMER AND DIVERTED TO PWM WHEN THE 'AFT CABIN DOOR' ANNUNCIATOR ILLUMINATED SHORTLY AFTER LEVELOFF AT CRUISE ALT. UPON LNDG AT PWM, THE CARGO DOOR WAS INSPECTED AND FOUND TO BE PROPERLY LOCKED AND IN GOOD WORKING CONDITION. MAINT WAS APPRISED OF THE SIT AND THE ITEM WAS DEFERRED IN ACCORDANCE WITH MEL. IN COMPLIANCE WITH MEL A FLC MEMBER INSPECTED AND CONFIRMED THE DOOR CLOSED AND LATCHED PRIOR TO EACH FLT AND THE FASTEN SEATBELT SIGN WAS LEFT ILLUMINATED. DURING THE SUBSEQUENT FLT FROM PWM TO BOS THE ANNUNCIATOR OPERATED NORMALLY AND NO FURTHER DISCREPANCY WAS NOTED.

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.